Estates & Facilities Management.
UNIVERSITY OF SHEFFIELD SAFETY PROCEDURE
Electrical Safety Procedures
Issue 2, (Rev2) Feb 2014 Estates & Facilities Management
Electrical Safety Procedure
Electrical Procedures This document does not confer the right for staff to undertake any electrical work described by this document that could: a) impact upon the capacity of the electrical distribution system within the building; b) impact upon the fabric of the building; c) require an increase in the number of suitable and sufficient electrical sockets; :- without contacting Estates & Facilities Management to discuss your specific requirements. i)
Suitability of existing distribution system through Help Desk
ii) Requests for additional supplies through Help Desk
Issue 2, (Rev2) Feb 2014 Estates & Facilities Management
Electrical Safety Procedure
Electrical Procedures (SAFETY PROCEDURES FOR WORK ON/NEAR TO ELECTRICAL SYSTEMS, EQUIPMENT AND CONDUCTORS) Section Application and Requirements
A
General
B
Work Carried out by Contractors
C
Work on Low and Extra Low Voltage Equipment
D
Work on or Near High Voltage Equipment
E
Electrical Equipment and System Maintenance/Testing
F
Control of Electrical Equipment by Plant Operators
G
Portable Electrical Equipment
H
Generating Plant
I
Avoiding Danger from buried electricity Cables & Metallic Pipework and Overhead Lines
J
Work on Electrical Equipment in Potentially Explosive Atmospheres
K
Appendices 1
Danger Notice
2
Caution Notice
3
Permit to Work on High Voltage Equipment
4
Certificate of Isolation
5
Switching Schedule
6
Sanction for Test
7
Limitation of Access
8
Certification of Authorisation/Competent Person
9
Electrical Engineering Authorised Persons
10
Electrical Technicians and Electricians/Competent Persons
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Electrical Safety Procedure
SECTION A APPLICATION AND REQUIREMENTS
1.1
Scope These Safety procedures shall be applied to all work on or near to electrical systems, equipment and conductors under the ownership or control of the University, under whose authority they have been issued. These procedures are to be utilised in support of the requirement for task specific risk assessments. All relevant Codes of Practice and British Standards shall be applied to all engineering work and in particular the Electricity at Work Regulations 1989.
1.2
Other Safety Procedures and Related Documents In addition to the application of these Safety Procedures and related documents, other procedures, rules and documents issued by the University shall be complied with where relevant, in particular the latest edition of the Departmental Code of Practice for Health and Safety. Whereas the Appendices to these 'Safety Procedures' are not in themselves, individual "Safety Procedures", they shall be read in conjunction with the procedural parts to which they relate. Where University employees are required to work on or near to electrical systems, or equipment not owned or controlled by the University, formal arrangements for health and safety will be made between the University and the owner or controller of the system/equipment on which procedures, documents and rules shall be applied. Such arrangements should incorporate risk assessment and provision of detailed method statements, taking into account any additional training/authorisation required.
1.3
Information, Instruction and Training Arrangements shall be made by the University, to ensure:
1.4
1
That all employees concerned are adequately trained, informed and instructed as to the system, equipment and conductors which are affected by a particular operation or work and which legal requirements, safety procedures and related documents shall apply.
2
That other persons who are not employees, but who may be affected by the operations or work, also receive adequate information, instruction and training where appropriate.
Application of Safety Procedures These Safety Procedures and, as appropriate, related documents, shall apply to all employees of the University who have cause to control work on, or to work on or be near to, or operate electrical systems, equipment and conductors. Persons who have cause in the normal course of their duties, to be involved with only specific sections of these procedures, shall still be provided with all sections. Specific classes of work will be shown on the Certificate of Authorisation (Appendix 8). Contractors or any other persons working on University property, who have cause to be involved in similar work to that described above, shall also be supplied with these safety procedures. This will enable the development of their own safe systems of work based upon their own risk assessment undertaking (see Section C).
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Electrical Safety Procedure
All employees and other persons issued with these Safety Procedures shall sign a receipt for their copy (and any amendments thereto) and shall keep them in good condition and have them available for reference as necessary. Never work on any electrical equipment, system or conductor unless you have received the necessary training, have the appropriate experience and have been authorised to undertake that work. 1.5
All persons likely to work on or accompany persons who work on apparatus to which these electrical procedures relate shall receive instruction/training in emergency first aid procedures.
1.6
Review of Safety Procedures Due to the nature of electricity at work these procedures will be under constant review, updated and amended accordingly.
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Electrical Safety Procedure
SECTION B GENERAL
1.0
Duties
1.1
The Health and Safety at Work etc Act 1974 requires that every employee while at work takes reasonable care for the health and safety of himself and others. It shall also be his duty to co-operate with his employer to conform with the requirements of the Act.
1.2
All employees of the University, whose duties may include the working on, operation of, or working near electrical systems, equipment and conductors, have a duty to comply with "The Electricity at Work Regulations 1989" and shall follow the relevant procedures detailed in this document ie the University of Sheffield – Electrical Safety Procedures.
1.3
There is always a serious danger present when working on, or near, electrical systems and equipment, irrespective of voltage level. It is therefore essential that all personnel are competent ie properly trained, qualified, experienced with the particular electrical system and equipment involved, and familiar with all relevant regulations and Codes of Practice, etc. This includes familiarity with resuscitation procedures and dealing with fires of an electrical origin. Failure to comply with this requirement could result in "injury" ie death or personal injury from electric shock, electric burn, electrical explosion or arcing, or from fire or explosion initiated by electrical energy. See Appendix 8, Certification of Authorisation.
1.4
All persons that may in the course of their duties have cause to work on, operate, or be near to electrical systems, equipment, or conductors must therefore be appointed in writing to carry out specified duties for which they are competent.
2.0
Obstruction of Electrical Equipment Electrical equipment shall be free from obstruction in order to be accessible for maintenance and operation. Where switchgear, distribution boards, etc, are placed in workshops, offices, stores or corridors, the positioning of non-electrical equipment or office furniture must not restrict free access. Where it is considered necessary, notices shall be posted, stating that access should not be obstructed/restricted. Good housekeeping is needed to ensure that pressures on available space do not lead to encroachments on the allocated areas and access. As the above is an "Absolute Requirement" of the Electricity at Work Regulations 1989, failure to comply could lead to disciplinary action or even prosecution.
3.0
Objections
3.1
When any person receives instructions regarding work on or near electrical systems, equipment or conductors, any objections shall be reported to the person issuing those instructions who will have the matter investigated and if necessary refer to higher authority or the electrical adviser.
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4.0
Access to and Work Within Fire Protected Areas
4.1
Automatic Control Unless alternative approved procedures apply because of special circumstances, then before access to, or work on, or other activities are carried out in any enclosure protected by automatic fire extinguishing equipment, then the person authorised to undertake the work shall ensure that:
4.2
1
The automatic control shall be rendered inoperative and the equipment left on hand control. A caution notice shall be attached.
2
Precautions are taken to render the automatic control inoperative and the conditions under which it may be restored shall be noted on any safety document or written instruction issued for access, work or other activity in the protected enclosure.
3
The automatic control shall be restored immediately after the persons engaged on the work or other activity have withdrawn from the protected enclosure.
Portable Fire Extinguishers Only approved portable fire extinguishers shall be available and used in the vicinity of live apparatus and conductors. (These will be either carbon dioxide or dry powder fire extinguishers).
4.3
General After any explosion or fire, or after the discharge of fire extinguishers in an enclosed space, the space shall be adequately ventilated before entry of personnel.
5.0
Definitions Risk Assessment This is the process of analysing the level of risk, considering those in danger and evaluating whether hazards are adequately controlled, taking into account any measures already in place. Extra Low Voltage Normally not exceeding 50 Volts AC or 120 Volts DC whether between circuit conductors or to earth. Low Voltage Normally exceeding extra low voltage but not exceeding 1,000 Volts AC or 1,500 Volts DC between circuit conductors or 600 Volts AC and 900 Volts DC between circuit conductors and earth. High Voltage Normally exceeding low voltage. Equipment Includes anything used, intended to be used or installed for use, to generate, provide, transmit, transform, rectify, convert, conduct, distribute, control, store, measure or use electrical energy.
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Conductors Any material which is capable of conducting electricity. This is not limited to conductors intended to carry current. Circuit Conductors Any conductor in a system which is intended to carry electric current under normal conditions. Conductors in a System Any conductor electrically connected to a common source of electrical energy. System An electrical system in which all the electrical equipment is or may be electrically connected to a common source of electrical energy and includes such source. Danger Risk of injury. Injury Death or injury to persons from electric shock, electric burn, fires of electrical origin, electrical arcing or explosion initiated by electricity. Note: There are no voltage limits, the criteria being whether danger as defined arises. Isolation The disconnection and physical separation of electrical equipment from every source of electrical energy in such a way that the disconnection and separation is secure. Live Electrically charged. Dead At, or about, zero voltage and isolated from any live system. Approved (including equipment) Of a type sanctioned for use by the University meeting all relevant safety standards. All products shall comply with all relevant British Standards and current EU Legislation. Caution Notice (Appendix 2) A notice in approved form securely attached to equipment or its controlling device(s) conveying a warning not to interfere. Danger Notice (Appendix 1) A notice in approved form attached to equipment or sections when live, calling attention to the danger of approach to, or interference with, such equipment or sections.
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Persons – He/His/Him/Himself Throughout this document, words denoting the masculine gender shall be deemed to include the feminine gender. Supervising Officer (Electrical) A person appointed in writing for the purposes of engaging contractors under the University's safety procedure. Duty Holder A "Duty Holder" is a person on whom the "Electricity at Work Regulations 1989" places a duty to comply because they relate to circumstances which are within his control. For circumstances, to be within a person's control, that person must be competent or delegate the duties to a competent Person. Therefore by definition, every employer or employer's representative is a Duty Holder, as is each "Senior Authorised - (Electrical)", "Authorised – (Electrical)" and "Competent Person – (Electrical)". Competent Person (Electrical) (Appendix 8) A person who possesses sufficient technical knowledge or experience of the particular electrical system and equipment to be worked upon or operated, enabling that person to take the necessary precautions to avoid danger. Further measures of competency will include: familiarity with resuscitation procedures, dealing with fires etc. Authorised Person (Electrical) (Appendix 8) A Competent Person adequately trained and appointed in writing by a Senior Authorised Person to carry out specific categories of duties on electrical systems and equipment. The Certificate of Authorisation shall clearly state the class of operation and or work that person is authorised to carry out. Senior Authorised Person (Electrical) – University (Appendix 8) An Authorised Person (Electrical) having received formal training in high voltage switching and working procedures, who has been appointed in writing by the Facilities Management Director. Certain Senior Authorised Persons (Electrical) may have additional approval to appoint other Senior Authorised Persons (Electrical) within the University and employees of consultants or contractors required to work on the University proposed or existing high voltage installations. The appointment shall clearly state the specific site and extent of duties. It must be noted that specific electrical work undertaken for/on behalf of the University by outside companies will be the subject of a detailed safe system of work prepared by that Company. Electrical Adviser (EA) A person possessing the required level of knowledge, experience and qualifications to advise on all matters relating to University electrical procedures, their appointment being indicated on the existing authorisation certification. This person will therefore already be a Senior Authorised/Authorised Person (Electrical). Principal Electrical Advisers will ensure compliance with University policies and procedures and advise the University on the impact of legislation relevant to their discipline.
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Earthed Connected to the general mass of earth by approved earthing leads in such a manner as will ensure at all times an immediate discharge of electrical energy without danger. Circuit Main Earth An earthing arrangement applied by an Authorised (Electrical) or Senior Authorised Person (Electrical) (high voltage) which effectively connects all circuit conductors to earth, recorded in and before the issue of a "Permit of Work" or "Sanction for Test". Additional Earths An approved and additional earthing arrangement which is applied after the issue of a "Permit to Work" or "Sanction for Test" by the Permit holder (eg an earth applied at the point of work). Permit to Work (High Voltage) PTW (HV) (Appendix 3) A declaration signed and issued by a Senior Authorised Person (Electrical) to a person in charge of work to be carried out on high voltage equipment, stating specifically the details of work to be carried out, where the equipment has been isolated, discharged and efficiently connected to earth and on which it is safe to work. Clearance Certificate A section of the "Permit to Work" where the recipient declares that the work detailed on that permit has been completed/suspended, that all additional earths have been removed and personnel under the direct charge of that person have been warned that no further work is to be carried out. Sanction for Test (Appendix 6) A Form of Declaration signed and given by a Senior Authorised Person (Electrical) to a person in charge of testing high voltage apparatus, for the purpose of making known to such person, exactly what apparatus is to be tested and the condition under which the testing is to be carried out. Limitation of Access (Appendix 7) A form issued and cancelled by a Senior Authorised Person (Electrical) (or Authorised Person (Electrical) specially authorised to do so in writing), defining the limits and nature of work which may be carried out in the vicinity of live equipment. A Limitation of Access is issued when a Permit to Work is not applicable and when verbal instructions are not considered sufficient. Switching and Application of Earths The operation of switchgear, fuses or other methods of breaking or making a circuit in a recognised safe manner (other than functional switching). Functional Switching Functional switching is the making or breaking of current for normal operation or control of equipment. Emergency Switching Rapidly cutting off electrical energy to remove any hazard to persons, livestock or property which may occur unexpectedly. Issue 2, (Rev2) Feb 2014 Estates & Facilities Management
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Key Safe An approved device for the secure retention of all keys used to lock off shutters, switchgear, earthing or other safety devices in accordance with high voltage procedures. Potentially Explosive Atmosphere A potentially explosive atmosphere is an area where the presence or possible presence of a dust or flammable gas/air mixture requires that special precautions be taken to avoid the possibility that any electrical equipment placed within the potentially explosive atmosphere becomes a source of ignition for the hazard. Intrinsic Safety A protection technique based upon the restriction of electrical energy within apparatus and of interconnecting wiring, exposed to a potentially explosive atmosphere, to a level below that which can cause ignition by either sparking or heating effects. Because of the method by which intrinsic safety is achieved, it is necessary to ensure that the electrical apparatus exposed to the potentially explosive atmosphere, and also other electrical apparatus with which it is interconnected, is suitably constructed. Intrinsically Safe Circuit A circuit in which no spark or any thermal effect produced under test conditions (which include normal operation and specified fault conditions) is capable of causing ignition of a given explosive atmosphere.
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SECTION C WORK CARRIED OUT BY CONTRACTORS
1.0
All electrical contractors shall be registered and on the National Roll of Approved Contractors with the Electrical Safety Council (formerly the National Inspection Council for Electrical Installation Contracting). The NICEIC acts as the electrical contracting industry’s independent voluntary regulatory body for electrical installations and safety matters. It shall be a requirement of every contractor, carrying out electrical work, using electrical equipment, controlling electrical work, or being near to electrical systems, equipment and conductors under the ownership of, or being constructed for, the University to acknowledge receipt of these procedures, undertake their own risk assessments and submit method statements/safe systems of work (their own procedures) for undertaking the work activity. Such procedures shall have the effect of being comparable to University procedures, as a minimum standard and incorporate any specific arrangements such as for receipt/issue of permits, authorisation documentation etc.
2.0
A copy of the relevant sections of these procedures must be supplied to the representative of each contractor or anybody carrying out work covered by them. It shall be that representative's responsibility to ensure his/her company is made aware of the requirements of this procedure and any additional information supplied, prior to undertaking their statutory risk assessments. A signature for receipt of the procedures and any additional hazard/risk information will be required. The document will be duplicated for retention by the University or their agent(s) and the representative's organisation.
3.0
It shall be the Supervising Officer's duty to ensure the issue of the procedures and any other relevant information that could contribute to the health and safety of the contractor's employees. The method statement/safe system of work submitted by the contractor will be scrutinised for compliance to these procedures as a minimum standard. This scrutiny to be undertaken by the officer, or a person appointed by the University for this purpose. Any deficiencies identified will be brought to the attention of the contractor's representative.
4.0
Where representatives of a regional electricity company have the right by statute and agreement to enter and operate equipment which is their property and forms part of their distribution system, these procedures will still be issued where applicable and method statements relating to the electricity company's work operation will be received. This is important to ensure that employees of both the University and Regional Electricity Company are made aware of each other's activities, thereby allowing any associated risks to be evaluated.
5.0
The use of electricity on construction sites must comply with the requirements of the Health and Safety Executive guidance note HSG85 and in addition: 1
Where the current Construction (Design and Management) Regulations 2007 (CDM) apply, there will be a requirement for the appointment of a CDM Coordinator and a Principal Contractor. A Health and Safety Plan, drawn up by the CDM Co-ordinator and developed by the Principal Contractor at the outset of the project and for its duration, including commissioning, will account for the operation of these procedures.
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2
For non-CDM projects a site access control system shall be established where the contractor will report their daily presence to a University representative. An activity board may be utilised indicating at a glance the daily programme of site electrical activity. Any deviation from the agreed safe system of work shall be agreed between the Supervising Officer and the contractor and any subsequent amendments recorded.
3
For use of contractors in a labour only role, where the University effectively controls the contractor's work, the University will apply the same controls as for directly employed staff, ensuring competencies are maintained. (Refer to Electrical Adviser).
4
Only certified "Authorised Persons (Electrical)" appointed by the University shall be responsible for the issuing of Permits to Work and other relevant documentation, other than those issued by and under the control of the contractor.
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SECTION D WORK ON LOW AND EXTRA LOW VOLTAGE ELECTRICAL EQUIPMENT
1.0
Precautions to be Taken Before Working on Low and Extra Low Voltage Electrical Equipment Before any work is carried out, the Authorised Person (Electrical) in charge of the activity should ensure that there is sufficient information available. The approved safety/test equipment and a means to isolate effectively from all sources of electrical supply, the equipment/system to be worked on shall be made available. The points of isolation should be clearly identified and consideration must be given to the erection of barriers restricting access to live equipment. When carrying out isolation procedures of a complex nature or for other than University employees, a low voltage certificate of isolation shall be issued. (Appendix 4). A copy shall be retained by the recipient and the equipment shall not be re-energised until the clearance/cancellation sections have been completed.
2.0
Procedures for Working on Dead Electrical Equipment
2.1
When work is to be carried out on low and extra low voltage electrical equipment, it shall be isolated from all points of supply.
2.2
Where the means of isolation incorporates a locking off facility this must be used, attaching a personal safety padlock. General purpose University approved Caution Notices should be securely fixed to all points of isolation. Emergency stop operation is not acceptable as a means of isolation.
2.3
In circumstances where the means of isolation described in paragraph 2.2 cannot be achieved, the removal of fuse/links and their being held by the person doing the work is acceptable. Caution Notices should be secured across the fuse/link bases. In addition, a further caution notice should be fixed to the outside of the cabinet. Suitable precautions shall be taken by screening shrouding etc to avoid inadvertent contact with live conductors within the working zone. The circuit shall then be proved dead by means of an approved indicator, the indicator itself being tested immediately before and after verification. The presence of electromagnetic induction, mutual capacitance or stored electrical energy may have to be guarded against (for example, long cable runs).
3.0
Working on Live Electrical Equipment
3.1
Any work activity on or near any live electrical equipment is prohibited. Live diagnostic testing is only permitted when no alternative testing method is available (See 5).
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4.0
Exemptions
4.1
Compliance with clause D3.1 is not obligatory for work on extra low voltage electrical equipment, but if the equipment can be made dead, then this must be the practice. THIS EXEMPTION DOES NOT APPLY TO ELECTRICAL EQUIPMENT IN POTENTIALLY EXPLOSIVE ATMOSPHERES. (SEE SECTION K).
5.0
Testing on Live Electrical Equipment When no alternative method is available, testing on electrical equipment may be carried out with the equipment live, using approved testing apparatus, provided adequate precautions have been taken by screening/segregation or other means to prevent injury from inadvertent contact with live equipment. If a second Competent Person could assist in the prevention of injury, or could substantially contribute towards the implementation of safe working practice, then a second Competent Person should be present. Before work can begin on any live equipment/plant the Competent Person (electrical) shall provide a formal risk assessment of the activity. See Section K for procedures to be adopted in potentially explosive atmospheres.
6.0
Battery Systems – See University Safety Procedure
6.1
When handling batteries, wear protective clothing to protect eyes and exposed skin.
6.2
Battery electrolyte is corrosive and if spilt or splashed on equipment or person immediate action should be taken. See COSHH sheets.
6.3
Under certain recharging conditions batteries give off hydrogen gas, care must be taken to prevent any naked flames, cigarettes etc from igniting it. Smoking is prohibited. Adequate ventilation is essential.
6.4
Some equipment may carry dangerous voltages and stored electrical energy. Before work commences, carry out the following:
7.0
1
Isolate the AC mains supply external to the equipment.
2
Isolate the battery and external load to the equipment.
3
Discharge all electrolyte filter capacitors.
Uninterruptible Power Supplies (UPS) UPS shall be covered by individual isolation procedures, relating to the specific installed system. Generally, both mains and battery supplies shall be isolated before work can commence. NB: Care shall be taken as generator supplies may also be involved – consult with the Electrical Adviser.
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8.0
LV Panel Boards
8.1
Normal Operation Generally, the University systems are designed to operate for normal use as follows: 1
All busbar links to be switched off and locked off.
2
All ring feeder isolators to be switched off and locked off.
3
All main switches to be switched ON.
This ensures that all switchboards are fed as radial circuits from the main switchboard and that transformers are not connected in parallel. 8.2
Emergency Operation The University system is designed to allow for any transformer or main feeder cables to be isolated whilst maintaining the supply to the entire complex. 1
No more than two transformers shall be connected in parallel. Care shall be taken to ensure that transformers are not inadvertently connected in parallel. (Ideally, no transformer should be connected in parallel, however, the switchgear is designed to allow for a maximum of two transformers to be connected in parallel). Danger If three or more transformers are connected in parallel the prospective short circuit current will exceed the designed fault level of the switchgear – an explosion could result under fault conditions.
2
Any cable or item of switchgear shall be isolated from all sources to prevent backfeeds. All isolators shall be locked off and labelled.
8.3
Emergency Switching Any switching of main switches, ring feeder switches or busbar links shall only be carried out by certified Competent Persons authorised by the University. To ensure safe operation of the system all padlock keys for the main switchboards or boards shall be kept in a key safe in the appropriate sub-station. Where there is no local key safe then padlock keys shall be kept in a key safe in the Estates & Facilities Management office.
9.0
Electrical Safety – Demarcation of Responsibility The responsibility for the installation, maintenance, inspection and testing of electrical wiring of plant or equipment shall be as follows:-
9.1
Permanently Wired Plant or Equipment Estates & Facilities Management are responsible for:1
All fixed wiring up to and including each socket outlet, lighting point, isolator or fused connection unit.
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2
All electrical equipment usually connected by a fused connection unit or isolator, which is installed as part of the building's requirements.
3
Supervising the final connection of any client department's piece of electrical equipment and any plug and socket connections excluding equipment connected to a 13A socket.
4
Confirming that the safety and infrastructure load implications are fully satisfied.
Each University department is responsible for:-
9.2
1
Inspecting, testing and maintaining in a safe manner by a qualified and Competent Person in accordance with all relevant legislation and regulations, all electrical equipment usually connected by a fused spur or isolator which is installed as part of the department's requirements.
2
Ensuring that Estates & Facilities Management are informed via the Help Desk of the intention to purchase such electrical equipment.
3
Consulting with Estates & Facilities Management with regard to the installation, maintenance, inspection and testing. This must be carried out in line with all relevant legislation and regulations.
4
Arranging with Estates & Facilities Management for the final connection of any piece of electrical equipment.
Plant or Equipment Connected Via Plug and Socket Estates & Facilities Management are responsible for:1
Supervising the final connection of all 3 phase systems and single phase systems greater than 13A.
Each University department is responsible for:-
9.3
1
All electrical equipment connected to a 13A socket.
2
Ensuring that regular inspection, testing and maintenance of all items of stationary, IT, movable, portable or hand held equipment is carried out in a safe manner by qualified and Competent Persons in accordance with all relevant legislation and regulations.
240V Office Equipment All office equipment including PC's, printers, faxes, desk lamps, radios, TV's, DVD's, ohp's, slide projectors, approved office heaters, kettles, toasters, microwave ovens, etc shall be subject to approval and test prior to being placed into service. Each department must make arrangements for this test and approval system. An RCD (Residual Current Device) can be used to provide additional safety. RCD's to protect persons shall have a tripping current sensitivity of not more than 30 milli Amps (30 mA). Tripping times as specified in the current Wiring Regulations BS 7671. 1
An RCD is a valuable safety device, never bypass it.
2
If an RCD trips, it is a sign there is a fault. Check the system before using it again and report.
3
The RCD has a test button to check its mechanism is free and functioning. Test the RCD operation monthly and record details of operation.
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9.4
Work Safely Check that:-
10.0
1
Suspect or faulty equipment is taken out of use, labelled "DO NOT USE" and kept secure until examined by a Competent Person.
2
Where possible power sockets are switched off before plugging and unplugging.
3
Equipment is switched off and unplugged before cleaning or making adjustments.
Emergency Lighting Systems Maintenance 1
Always isolate the equipment from the emergency supply and battery before servicing. When isolating the battery always disconnect the negative lead first.
2
When the mains supply is isolated, the output terminals can still be live if the battery is connected. Before work commences both mains and battery must be isolated. NB : Although operating from a low voltage battery supply, transistor units may generate voltages up to 550V at high frequencies at the output terminals (see Section D, 6.0).
3
Rechargeable nickel cadmium batteries in self-contained emergency lighting luminaires contain an electrolyte which can be harmful to the eyes and poisonous or harmful to open wounds. Take care when handling – do not puncture or incinerate. Disposal of batteries shall be undertaken by specialists - ask Technical Services for information.
4
Should it be necessary to replace any component this should not be undertaken without first switching off normal mains supply, disengaging the plug and disconnecting the mains supply wires from the terminal block. On no account should any attempt be made to open the control units or inverters.
5
When handling take care not to 'short out' the battery terminals. This could cause passage of heavy current with possible injury by burning.
6
Repairs to emergency lighting systems shall be undertaken at a time of minimum risk, eg daylight hours. At the end of each repair, the supply to the normal lighting shall be restored. Charging arrangements shall be checked for proper functioning.
11.0
Fire Alarm Systems
11.1
Action Following a Fire The following work is carried out as soon as possible after any fire by Technical Services and Safety Services staff. Normal use of the area shall not be resumed until the work is carried out. 1
Each detector or call point which may have been affected by the fire should be tested: 1
Smoke detectors should be tested by the application of smoke or a recommended aerosol to the detector.
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2
Resettable heat detectors tested by the application of warm air.
3
Each fire alarm sounder should be tested.
4
A check should be made on the state of the battery and charger.
A visual examination should be made of any other part of the fire alarm system which lies within the fire area, or which might have been damaged by the fire. Any defect found should be recorded in the log-book and immediate action taken to correct the defect. The servicing organisation may have to carry out further checks for damage to the system. On completion of the work a Certificate of Testing shall be issued by the organisation responsible for servicing. 11.2
Action following a False Alarm Any alarm from a fire alarm system shall be treated as a fire until it can be proved to be false. When an alarm has been found to be false, the following immediate action should be taken by Technical Services and Safety Services staff.
11.3
1
Where possible establish the cause of false alarm and record in the log book.
2
Identify/investigate the particular detector or call point which has initiated the alarm - replace as necessary.
3
If necessary inform the organisation responsible for servicing and ask to investigate.
Action Following Faults If a fault has been shown to exist on any University fire alarm system, the University Control Centre and Technical Services Manager shall be informed. Immediate remedial action shall be taken by University Technical staff. The nature of the fault and the remedial action taken shall be recorded in the fire alarm log book. If possible determine the reason for the fault or note the activities immediately prior to the fault in the area affected. If the fault cannot be rectified by Technical Services, inform the University Engineer, who will arrange for the fault to be repaired with the organisation responsible for the servicing. On completion of the work a Certificate of Testing should be issued by the organisation responsible for servicing. In the interim the University Engineer along with Safety Services will determine which areas are affected by the fault and decide whether special action (such as fire patrols) are needed in that area. NB. After any work/alarm condition on the fire alarm system, Technical Services staff shall ensure that all auxiliary equipment, ie fire doors, maglocks, ventilation and plant are reset/reinstated.
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Electrical Safety Procedure
12.0
Building Management Systems (BMS) All BMS control equipment shall be labelled to show its function, designation and to notify staff that control of such equipment is remote. Before work is carried out on any remote or automatically controlled equipment, all remote control and automatic features shall first be rendered inoperative. Inform Technical Services prior to any work starting so that plant may be isolated, Caution Notices attached, and maintenance staff notified. Whilst such work is in progress no work shall be carried out on the controlling equipment, wiring or relays. BMS control equipment may include pumps, motors, motorised valves, boilers, air conditioning units, chillers, etc, all of which may be energised at any time. All plant therefore shall have local isolators – prior to any work these isolators shall be opened and locked open and Caution Notices attached.
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Electrical Safety Procedure
SECTION E WORK ON OR NEAR HIGH VOLTAGE EQUIPMENT
The procedures detailed below are in addition to those for low and extra low voltage detailed in the preceding sections. 1.0
Access
1.1
Access to High Voltage Sub-stations and Switchrooms These areas shall normally be kept locked with keys held in a key safe, or by appropriately authorised staff. No person shall enter such areas, unless:
1.2
1
That person has received written authorisation from a Senior Authorised Person (Electrical), or
2
That person is Senior Authorised, Authorised, or a Competent Person (Electrical) specifically permitted to do so in writing, or
3
He is accompanied by a Senior Authorised, Authorised, or Competent Person (Electrical). It is recognised that the class of person detailed in 1, may require access to areas containing high voltage equipment to carry out his duties eg plant room attendant, electrician, meter reader etc. That person would require "Special Authorisation". This authorisation must be specific in relation to the following conditions: 1
All switchgear which have exposed live conductors must be adequately screened/shrouded etc.
2
Interference with switchgear or other high voltage equipment is prohibited.
3
Required duties do not give rise to danger when unaccompanied. If the above conditions cannot be met, then that person must be accompanied at all times by a Senior Authorised, Authorised, or Competent Person (Electrical).
Access to Other Areas Containing High Voltage Equipment These areas should normally be kept locked. Where an area contains HV equipment other than switchgear, authorisation may not be necessary.
1.3
Access to High Voltage Enclosures and Equipment Barriers, screens, cubicles, panels etc containing live high voltage conductors shall be kept locked. No person shall have access to any such enclosure containing live conductors which are exposed. All spout shutters not required for immediate work or access/operation shall, if not otherwise made inaccessible, be locked shut.
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Electrical Safety Procedure
2.0
Switching
2.1
Operation of Switchgear Switching (other than that defined in Section G) shall be carried out only by a Senior Authorised Person or an Authorised Person (Electrical) specifically permitted to do so in writing. Before any switching operation (as a requirement for the issue of a Permit to Work) the Senior Authorised Person (Electrical) shall draw up a switching schedule (see Appendix 5) detailing the necessary course of actions. When switchgear shows any sign of distress after operation, its condition shall be reported and recorded for investigation on the HV log book. Names and contact details of all authorised persons are listed within the appropriate HV sub-station.
2.2
Recording of switching After each switching operation, the time shall be recorded in the column provided in the switching schedule and HV log book.
2.3
Equipment Which can be Made Live from An External Electricity Network Before any switching or earthing is carried out, or a Permit to Work issued for work on equipment which can be made live from an external network, the switching and earthing shall first be agreed with the third party concerned and their Permit to Work or Certificate of Isolation must be received before issuing a Permit to Work by the University.
2.4
Safety Locks The Senior Authorised Person (Electrical) issuing the Permit to Work shall lock off all switches at points where the circuit on which work is to be carried out could be energised. The keys for such locks shall be kept in a key safe. When the circuit on which work is to be carried out is controlled only by fuses or links, the fuses, links and carriers shall be removed and kept under the control of the Senior Authorised Person (Electrical) responsible for issuing the Permit.
2.5
Caution and Danger Notices etc Caution Notices (Appendix 2) shall be fixed on all switchgear controlling the apparatus which has been made dead and on which work is to proceed. Danger Notices (Appendix 1) shall also be attached on or adjacent to live apparatus at the limits of the zone on which work may be carried out. Caution Notices, Danger Notices, barriers, screens and shrouding shall be fixed or moved only under the supervision of the Senior Authorised Person (Electrical) responsible for issuing the permit.
3.0
Precautions to be taken before Working on High Voltage Equipment/Systems No person shall carry out any repairs, maintenance or alterations to primary high voltage equipment unless the equipment is dead and earthed (excluding Sanction for Test) and that person is competent in the specific class of work and is authorised in writing to do so OR Is working under the direct Supervision of such a Competent Person.
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Electrical Safety Procedure
3.1
Procedure No work activity shall be initiated unless a Senior Authorised Person (Electrical) is present and the following procedure implemented: 1
Establish points of isolation, isolate and lock off the equipment from all live conductors.
2
Efficiently connect the equipment to earth at all points of isolation, or between such points and the point(s) of work.
3
Prove the equipment to be dead at point of work.
4
Caution Notices have been securely attached to the equipment and points of isolation.
5
Adjacent live equipment is adequately screened/shrouded and Danger Notices attached in order to clearly define the boundaries of the safe zone of work.
6
A Permit to Work is issued specifying the work to be carried out, with the recipient signing for and acknowledging his understanding of the extent of work to be carried out.
4.0
Earthing
4.1
Circuit Main Earths When high voltage apparatus is to be discharged and earthed, it shall be done:
4.2
1
Where practicable by the use of a circuit breaker or specially provided earth switch to make the earth connection. When the circuit breaker is used, the trip feature shall be rendered inoperative before closing unless this is impracticable. After closing, the circuit breaker or earth switch shall be locked in the earth position, while it is the circuit main earth.
2
Where 4.1.1 is not practicable, the high voltage apparatus shall be tested to ensure that it is dead and shall then be discharged and earthed by an earthing lead to all phases applied by means of a pole or other approved apparatus.
Earthing Leads and Connections Earthing leads and associated clamps shall be of an approved type and of adequate capacity for the duty at the point of application. Earthing leads shall be properly maintained and always examined immediately prior to use, and if deemed defective replaced by a suitable lead.
4.3
Operation No high voltage earthing switch shall be operated or circuit main earth connection attached or removed except by a Senior Authorised Person (Electrical) (or an Authorised Person (Electrical)).
4.4
Recording of Circuit Main Earths The precise location of each relevant circuit main earth shall be recorded on the Permit to Work (Appendix 3).
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Electrical Safety Procedure
4.5
Procedure for the Use of Earthing Leads The procedure to be followed when using earthing leads shall be:
4.6
1
Verify that the circuit is dead and test by means of a voltage indicator of approved type, the indicator itself being tested immediately before and after the verification.
2
Earthing leads shall be connected to the earth system before being secured to the phases. They shall only be secured to the phases by means of a pole or other approved apparatus. Care must be taken to ensure that good contact is made.
3
All phases shall be earthed, even if work is to be carried out on one phase only.
4
Earthing leads shall not be applied in any cell or compartment in which there is any exposed live parts at high voltage.
5
When earthing leads are being removed, they shall be disconnected from the phases first and the earth system last.
6
For the purpose of earthing on spout contacts of metal clad switchgear approved appliances only shall be used. The insertion of the hand or any tool in contact spouts for this purpose is forbidden.
Additional Earths - as Definition Additional earths applied after the issue of a Permit to Work may be attached or removed by the recipient of the PTW.
5.0
Permits to Work, Certificates of Isolation, Sanction for Test and Limitation of Access
5.1
Authority for Issue Permits to Work or Sanction for Test shall only be issued by a Senior Authorised Person (Electrical). Certificates of Isolation shall only be issued by a Senior Authorised or Authorised Person (Electrical).
5.2
Procedure for Issue and Receipt A Permit to Work, Sanction for Test, Limitation of Access or Certificate of Isolation shall be issued to the person in charge of the work, who after reading its contents to the person issuing the Permit to Work, Sanction for Test, Limitation of Access or Certificate of Isolation shall thereupon sign its receipt and its duplicate. The recipients of a Permit to Work or Sanction for Test shall retain them in his possession at all times whilst work is being carried out. A copy shall be kept in the key safe and the second copy shall remain in the issuing 'book'. The keys used to lock off and make secure the equipment shall be held in the key safe. Each recipient of the Permit to Work shall, retain in their safe custody one of the unique door keys belonging to that safe. The Senior Authorised Person (Electrical) issuing the Permit to Work shall also retain one key, and all safety documents shall be cross referenced. Where more than one working party is concerned, a Permit to Work, Limitation of Access or Certificate of Isolation shall be issued to the Competent Person in charge of each working party.
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Electrical Safety Procedure
5.3
Precautions during Progress of Work The equipment isolated and earthed for work under the terms of a Permit to Work shall remain so until the Permit to Work has been cleared, returned to a Senior Authorised Person (Electrical), and cancelled. The recipient of a Sanction for Test (Appendix 6) will be responsible for co-ordinating all testing operations on the isolated equipment and for ensuring safety during the tests. He may remove and replace earths as necessary and carry out tests including making live the equipment concerned from a testing supply.
5.4
Procedure for Clearance and Cancellation When work on equipment for which a Permit of Work or Sanction for Test has been issued is suspended or completed, the recipient shall sign the clearance and return the Permit to Work or Sanction for Test to the Senior Authorised Person (Electrical) who issued the Permit who shall cancel it. At this stage the key(s) for the key safe door shall be handed back to the Senior Authorised Person (Electrical) who issued the permit. Where more than one Permit to Work has been issued for work on high voltage equipment associated with the same circuit main earths, the Senior Authorised Person (Electrical) shall ensure that all such Permits to Work have been cancelled before the circuit main earths are removed. When work for which a Limitation of Access (Appendix 7) has been issued, is suspended or completed, the recipient shall sign the clearance and return the Limitation of Access for cancellation to the Authorised/Senior Authorised Person (Electrical) who issued the Permit. NOTE 1: If the original Permit to Work or Limitation of Access Certificate is defaced, lost or destroyed, then the copy from the key safe shall be used for clearance and cancellation. NOTE 2: If the recipient is unavailable for clearance purposes, then the certificate may be cancelled, provided it is signed by the Senior Authorised Person (Electrical) and confirmation is received in writing from the recipient's supervisor, stating that the work has been suspended/completed. NOTE 3: If the Senior Authorised Person (Electrical) is unavailable for clearance purposes then the certificate may be cancelled by another Senior Authorised Person (Electrical).
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Electrical Safety Procedure
6.0
Testing of High Voltage Equipment When any high voltage equipment is to be subjected to test voltage before being connected to the high voltage system, the person responsible for applying the test voltage shall ensure that such equipment is adequately guarded to prevent danger and that Danger Notices are attached in conspicuous positions during the period the equipment may be subject to voltage. All cables shall be discharged before and after the application of test voltage. 1
High voltage equipment shall not be connected to the system until such equipment has passed the tests.
2
The phasing of any equipment which is to be connected or be reconnected to a high voltage system shall be verified using approved equipment by the Senior Authorised Person (Electrical) responsible for the work before the equipment is put into commission on the high voltage system.
Temporary conductors used for testing purposes shall be suitably voltage/current rated and easily visible. Test connections shall not be applied in a cell or compartment in which there is an exposed live part at high voltage. (This rule does not exclude the use of approved voltage indicators, or approved devices for testing and phasing out circuits). 7.0
Instructions for Work on Particular Items of Equipment
7.1
Work on Remotely and Automatically Controlled Equipment Before work is carried out on remotely or automatically controlled equipment, all remote control and automatic features shall first be rendered inoperative by locking off and attaching Caution Notices. Whilst such work is in progress, no work shall be carried out on the controlling equipment, wiring or relays.
7.2
Work on High Voltage Metal-Clad Switchgear 1
(Busbar Spouts of Multi-Panel Switchboards) When work is to be carried out on busbar spouts, the following operations shall be carried out: 1
The section of the busbars on which work is to be carried out shall be isolated from all points of supply from which it can be made live, including VT's (Voltage Transformers).
2
The isolating arrangements shall be locked so that they cannot be operated and the shutters of live spouts locked shut. Where duplicate switches or on-load busbar selector isolators are installed and it is impossible to isolate them from all points of supply, then all switches that can be closed on to the busbars on which work is to be carried out, shall have their mechanisms locked in the open position and their closing mechanisms shall be made inoperative. (No work shall be carried out unless all supplies to bus bars are isolated and locked open).
3
Where practicable the busbars shall be checked by means of an approved voltage indicator to verify that they are dead, the indicator itself being tested immediately before and after the verification. The checking with the voltage indicator shall be done on the panel to be earthed with the circuit main earths.
4
Circuit main earths of approved type shall be applied at a panel other than that at which work is to be done, on the isolated section of busbars. The insertion of the hand or any tool into contact spouts for this purpose is forbidden.
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Electrical Safety Procedure
2
5
Caution Notices shall be securely attached at all points where the busbars can be made live.
6
Danger Notices (Appendix 1) shall be attached (where applicable) on or adjacent to the live apparatus at the limits of the zone in which work may be carried out.
7
A Permit to Work (Appendix 3) shall be issued.
8
Work on the spouts shall then be done under the personal supervision of a Senior Authorised Person (Electrical) who shall prove each spout dead by means of an approved voltage indicator before it is worked on, the indicator itself being tested before and after the verification.
Feeder Spouts, Voltage Transformer Spouts and Single Panel Busbar Spouts When work is to be carried out on feeder and voltage transformer spouts, or on the busbar spouts of a single panel, the following operations shall be carried out: 1
The spouts on which work is to be carried out shall be isolated from all points of supply from which they can be made live.
2
The isolating arrangements shall be locked so that they cannot be operated and the shutters of live spouts shall be locked shut.
3
The spouts contacts shall be checked by means of an approved voltage indicator to verify that they are dead, the indicator itself being tested before and after the verification.
4
The circuit shall be earthed with approved earthing equipment at the point of work and where practicable at all points of isolation from the supply. For the purposes of earthing metal-clad switchgear, approved appliances only shall be used. The insertion of the hand or any tool into contact spouts for this purpose is forbidden.
5
Caution Notices shall be securely attached at all points where the circuit can be made live.
6
A Permit to Work shall be issued.
7
Work on spouts shall then be done under the personal supervision of a Senior Authorised Person (Electrical), who shall remove the earths at the point of work and prove each spout dead by means of an approved voltage indicator, before it is worked on, the indicator itself being tested before and after the verification. If the only earths that can be applied to the circuit are those applied in the spouts and are circuit main earths, then while this work is in progress, no other work shall be carried out on the circuit connected to those spouts.
8
Where the spouts are connected to an overhead circuit on which there is any likelihood of dangerous induced voltages, additional earths shall be efficiently connected at the nearest point to the point of work where access to the conductors can safely be obtained.
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Electrical Safety Procedure
3
SF6 Switchgear (Sulphur Hexafluoride) 1
The Gas SF6 in its pure state is inert, colourless, odourless, tasteless, non-flammable, non-toxic and chemically stable in the normal conditions of use in electrical equipment. It is approximately 5 times heavier than air and at atmospheric pressure is a gas. It is used in its gaseous state under pressure to provide the required dielectric and arc interrupting characteristic. SF6, like nitrogen, will not support life. In its acute state Sulphur Hexafluoride is an asphyxiant. This should be particularly remembered when working in confined spaces or in low lying areas, such as cable trenches, tunnels etc. However, at voltages below 36 kV the amount of gas present in the switching device is quite small. Even in the very unlikely event of a total loss of gas, the resultant layer of gas in the average sub-station cannot exceed a few centimetres at floor level and this cannot give rise to lack of oxygen to personnel standing in the sub-station. In the event of a gas leak, increased ventilation will dispense any gas present. If there is any reason to suspect lack of oxygen after ventilation a detector shall be used to ascertain oxygen levels. For full safety information regarding SF6 see appropriate hazard data sheets.
2
The Enclosure SF6 switchgear enclosures are maintenance free and sealed for life, however, in the event of an internal failure accompanied by damage to the enclosure and release of SF6, do not operate the switch or circuit breaker. The gas pressure is continuously monitored by the SF6 pressure gauge on the front of all switchgear. NB: Under no circumstances operate the unit if the SF6 gauge is in the red indicator area.
4
Ring Main Units, Circuit Breakers and Switches Ringmaster and Genie switchgear incorporate SF6 insulated load break/fault make switches with either a tee-off fuse switch or SF6 circuit breaker. Genie EVO incorporate vacuum insulated load break/fault make switches and vacuum circuit breakers. No work activity shall be initiated unless a Senior Authorised Person (Electrical) is present, and the following procedure implemented. 1
Establish points of isolation, isolate and lock off the equipment from all live conductors.
2
Efficiently connect the equipment to earth at all points of isolation. Use the circuit breaker or load break/fault make switches to make the earth connections.
3
Prove the equipment to be dead at point of work.
4
Caution Notices have been securely attached to the equipment and points of isolation.
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Electrical Safety Procedure
5
7.3
5
Adjacent live equipment is adequately screened/shrouded and Danger Notices attached in order to clearly define boundaries of the safe zone of work.
6
A Permit to Work is issued specifying the work to be carried out, with the recipient signing for and acknowledging his understanding of the extent of work to be carried out.
Cable Testing 1
Establish points of isolation, isolate and lock off the equipment from all live conductors.
2
The earth switch must be switched on prior to the commencement of cable testing.
3
The test access key has the function of keeping the switch/circuit breaker ON in the earth position and allows the access point to be opened so that the earth links can be removed prior to the cable test.
4
With the earth bar removed testing can proceed.
Work on Transformers 1
Work on Transformers When work is to be carried out on the connections to or the windings of a transformer, the switchgear or fuse gear controlling all windings shall be opened or the windings or connections isolated by other approved means from live conductors. The transformer shall be earthed with approved earthing equipment at all points of isolation from high voltage supplies. Where automatic or motorised tap changers are installed, all control circuits and power supplies to tap changer motors shall be isolated. Additionally, to prevent the possibility of the transformer being made live by feedback from the lower voltage winding, fuses or links on associated voltage and auxiliary transformers shall be withdrawn and, where practicable, the voltage and auxiliary transformers isolated. Before a Permit to Work is issued, the Senior Authorised Person (Electrical) shall, at the point of work, identify the transformer to be worked upon. Where work is to be carried out on a high voltage transformer and the lower voltage windings of that transformer are controlled by a circuit breaker, switch or isolator, this must, if practicable, be withdrawn, locked open and earthed where practicable. Alternate, means shall be used to prevent the lower voltage circuit from being closed during the course of work. The transformer shall be isolated from all common neutral earthing equipment from which it may become live. This does not require the disconnection of solidly earthed neutrals or neutral equipment connected solely to the transformer on which work is to be done. Before any withdrawable voltage transformer is isolated, the associated high voltage connections shall, where practicable, be made dead. The reconnection of any withdrawable voltage transformer must always be done with the high voltage connections dead. Caution Notices shall be fixed at all points of isolation.
7.4
Repair Work on High Voltage Cables This is determined as a specialist activity and specialist contractors will be engaged.
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Electrical Safety Procedure
7.5
Fire Protection Equipment 1
Portable Extinguishers Only approved portable extinguishers suitable for electrical fires and appropriate to the type of work being undertaken shall be used in the vicinity of live electrical apparatus. After any explosion or fire, or after the discharge of extinguishers in an enclosed space, the space shall be thoroughly ventilated and tested before entry of personnel. (See University's Code of Practice for Health and Safety Part II Sections 1 and 2).
7.6
Work in Sub-Stations Containing HV Conductors Safety Clearances to Live Conductors. When work is to be carried out in a sub-station in which there are exposed live high voltage conductors then, unless the whole equipment is dead, the section which is made dead for work to be carried out shall be defined as far as possible by the use of barriers. They shall be arranged so that the minimum clearance from the nearest exposed conductor to ground level or platform or access way, which may be required to be used when the conductor is live, shall be: Rated Voltage
Clearance
Not exceeding 6.6 kV Exceeding 6.6 kV but not exceeding 11 kV Exceeding 11 kV but not exceeding 22 kV Exceeding 22 kV but not exceeding 33 kV
2.57 m (8 ft 5 in) 2.59 m (8 ft 6 in) 2.65 m (8 ft 8 in) 2.74 m (9 ft 0 in)
The area to be defined at ground level shall only be that in which the work is to be carried out. If the work cannot be carried out without leaving ground level, the above minimum clearances shall be obtained from the nearest exposed live high voltage conductor to the points from which the work is to be carried out. If the work is such that these clearances are not sufficient to avoid danger, other suitable arrangements shall be made to provide an adequate level of safety. The barriers shall be of non-metallic construction. At ground level, the 'unsafe' or 'live' area shall be distinguished by red flags on separate supports 2 ft to 3 ft within the 'unsafe' area and suitably spaced. NOTE: The given clearances should be maintained from all equipment utilised within the work area eg ladders, poles etc. Use of Portable Ladders and Long Objects where there are Exposed Live Conductors Portable ladders shall be of no greater length than is required for the work involved and shall be constructed of a non-conducting material. The use of aluminium ladders around electrical systems is forbidden. Portable ladders and other long objects shall not be used without the permission of a Senior Authorised Person and detailed within the agreed safe system of work. When cranes or other equipment such as preformed scaffolding are taken into or out of a sub-station, the route to be followed shall be agreed by a Senior Authorised Person and detailed within the agreed safe system of work. NOTE: Risk assessment shall be undertaken for the above activities, taking account of any requirements of additional earthing of apparatus etc. Issue 2, (Rev2) Feb 2014 Estates & Facilities Management
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Electrical Safety Procedure
SECTION F ELECTRICAL EQUIPMENT AND SYSTEM MAINTENANCE/TESTING
1.0
The operation, maintenance and testing of electrical equipment/systems must be carried out by persons who are competent for the particular class of work.
2.0
Maintenance/testing of electrical equipment/systems must be done on a regular basis to ensure safety of the equipment/system. Records of maintenance, including test results, must be kept throughout the working life of the equipment/system. It is the duty of any person employed on maintenance/testing to ensure that details of all maintenance and test results are recorded in a proper manner and any defects in the equipment system are also recorded.
3.0
Management and every person who uses protective equipment (eg special tools, test equipment or special protective clothing) shall in order to undertake work safely on electrical equipment ensure that: 1 2 3 4
It is suitable and safe for use It is maintained and stored correctly It is properly used It is tagged, tested and recorded
4.0
It shall be the duty of every person to ensure that all equipment and circuits are correctly identified in a legible and durable manner.
5.0
Any modifications carried out to a system must be recorded, documented and made available for audit, and shall not endanger the safety of the system as a whole. Reference should be made to the Electrical Adviser where appropriate.
5.1
Any modifications undertaken shall be added to the contents of the asset's health and safety file (if available) as required by the current Construction (Design and Management) Regulations 2007.
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Electrical Safety Procedure
SECTION G CONTROL OF ELECTRICAL EQUIPMENT BY PLANT OPERATORS
1.0
Functional Switching Personnel required, in course of their normal duties, to carry out functional switching, eg starting/stopping motors and switching generators on to line (load) etc, shall be appointed in writing by an Authorised or Senior Authorised Person (Electrical), as a Competent Person to carry out such duties. The authorisation shall clearly define the limitation of such operations. If the functional switching requires no special training or experience, then written authorisation is not necessary eg a plug and socket may be used as a functional switching device provided its rating does not exceed 16A. It shall be the duty of each person so authorised, to ensure that he/she complies fully with the requirements of the authorisation and reports any inadequacy in training, knowledge or unfamiliarity of equipment, to his immediate superior, who in turn shall report the fact to the Authorising Person. Emergency switching does not require authorisation.
2.0
Working on Electrical Plant and Systems All persons who may have to work on, or be concerned with the operation of the University's electrical distribution system or electrical apparatus, must be deemed to be competent, complying with relevant statutory requirements and with the requirements detailed in the University's Electrical Procedures. Details for isolating and working on low and extra low voltage are included in the procedures. The person concerned must be AUTHORISED for the task being undertaken and ensure that the procedures are complied with.
3.0
Working on Mechanical Plant For all machinery other than high voltage, the responsibility for isolation lies with the person who is doing the work. The procedure to be adopted is as follows: 1
Identify the plant to be worked on.
2
Identify the correct starter and isolator controlling the plant.
3
Confirm the correct identification by starting the plant and stopping it from the control panel.
4
Isolate the plant and lock the isolator in the off position with the multiclasp and personal padlock. Attach Caution Notices (also locked into position). Do not rely on any other padlock. Isolators should only be operated when the machinery has stopped. If an isolator does not have a locking device fitted, it must be tied open and caution notice fixed. Any isolator of this type must be reported to the Technical Services Manager who shall arrange for it to be changed/modified.
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5
Test operate plant to check that it is isolated.
6
When work is complete, remove personal padlock, multiclasp and caution notice and report that the plant is available.
7
If plant has to be left in a condition which if made live, could cause a danger to personnel or the plant itself, it should be left in the 'lock off' position and the Technical Services Manager informed immediately. To comply with these instructions, personal padlocks have been issued; these are to be used in the manner described and are for your personal protection only. They must not be used by anyone else. For plant left overnight with no lock-off facility additional precautions must be taken to clearly identify the dangers and the work area Supervisor notified.
8
The loss of a padlock or key must be reported immediately to your Technical Services Manager.
9
In addition to the above procedure, when working on mechanical plant, all isolating valves controlling the supply of liquid, air or gas to that plant shall be put into the closed/safe position and locked.
10
Under no circumstances must an emergency stop be used as a means of isolation.
NOTE: If the above work activity is to be undertaken by a person not authorised for the activity or by someone who deems that they are not competent to complete the isolation safely, then the isolation should be requested via the line management to Technical Service. The isolation will then be carried out by a person authorised to do so. LOCK - TAG - TEST - IF IN DOUBT ASK 4.0
Inspection of Mechanical Plant 1
Inspection of mechanical plant should always be done with the equipment isolated and locked off.
2
No work should be done on unguarded moving mechanical equipment.
3
Where inspection of moving mechanical equipment has to be carried out and guards require removal, the equipment shall be isolated and temporary guards must be fitted prior to running the equipment.
4
If there is a frequent need to inspect moving mechanical equipment and the removal of guards is necessary, the existing guards should be replaced with permanent mesh type guards, or a secondary guard fitted within the main guard covering dangerous rotating equipment.
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Electrical Safety Procedure
SECTION H PORTABLE ELECTRICAL EQUIPMENT
Portable electrical equipment includes all portable tools, transformers, handlamps, cables, leads, plugs, sockets, small generators etc and domestic equipment. Any person using portable tools or equipment, is classed as a "Duty Holder" and must therefore be competent in their use. Each person must be issued with the Safety Procedures. Each Competent Person has a duty to ensure that all persons under his/her control was aware of and implemented these procedures. (See Section D, 9.3 for 240V Office Equipment) 1.0
Purchase and Use of Portable Electrical Equipment All portable electrical equipment purchased for use within the University shall be subjected to approval and test prior to being placed into service. Each department must make arrangements for this test and approval system.
2.0
Hand-held Portable Tools All hand-held portable tools must operate at a voltage not exceeding 110 volts AC and the source of voltage must be centre tapped to earth. Use of portable equipment operating at a higher voltage is prohibited, unless special written authority has been given. This does not apply to domestic cleaners etc and class 2 domestic appliances and approved test equipment. Battery operated equipment, including cordless drills shall be used where practicable. Torches shall be carried by all personnel entering plantrooms, electrical switchrooms, subways, ducts etc.
3.0
Handlamps All handlamps must operate at a voltage not exceeding 50 volts AC between conductors and fed from a circuit which is isolated from the supply mains and from earth by means such as an isolating transformer. Where the environmental conditions are confined and conducting, such as inside boilers, tunnels and other cramped locations where persons are likely to come into good electrical contact with earthed surroundings, then the lamps should be supplied at a voltage not exceeding 25 volts AC. Refer to Health and Safety Executive Guidance Note PM38 for handlamps, for use in potentially explosive atmospheres.
3.1
Flashlights and Lanterns All University maintenance staff shall be provided with a suitable battery operated handlamp for use in plantrooms, service ducts, basements, switchrooms, etc.
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Electrical Safety Procedure
4.0
Small Portable Generators The following procedures apply to generators of output powers up to 5 kW rating, generally single phase machines driven by internal combustion engines. Typically such machines would be used for supplying 110 volt hand tools, emergency lighting sets etc. As portable tools require a 110 volt source that provides a maximum voltage to earth under fault conditions of 55 volts, such generators should be checked to see if this is so. Sets which have a 110 volt reference to frame shall be modified. Small generators purchased for supplying portable equipment should only have 110 volt outlets and be checked by electrical personnel before going into service, in order to ensure that the above requirements are satisfied. Always read and understand the manual before operating ie 1) Operate generators in well ventilated areas. 2) Stop the generator in order to refuel. Generators with 240 V outputs shall only be used in exceptional circumstances and be of a type approved by the University. (NB: All 240V outputs shall be protected with an appropriate RCD with 30 mA trip facility).
5.0
Portable Power Equipment All new equipment should, wherever possible, be purchased with a rating of 110 volts AC. Generally all units regardless of rating must be fed from an industrial BS 4343 socket, protected by a residual current device (RCD 30 mA trip). 1
Before use check: 1
The unit supply cable has no outward signs of damage.
2
The BS 4343 plug is intact.
3
The residual current device (RCD 30 mA trip) protecting socket, operates from its test button.
If any of the above checks are negative, do not attempt to use, but report, so that qualified electrical personnel can attend. 2
During use: 1
Avoid damage to supply cables and ensure that trailing cables are not in a position where they can cause a hazard.
2
Do not attempt to move unit whilst plugged in and avoid pulling on supply cable.
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Electrical Safety Procedure
3
After use: 1
Carefully coil up cable and attached to unit.
2
Store unit preferably indoors.
6.0
Safety Precautions in the Use of Portable Tools and Equipment
6.1
Before use, check that there is no outward damage to the equipment, plug or flexible lead.
6.2
Any defect or suspected defect in the equipment must be reported to your Supervisor immediately.
6.3
Any defective equipment must be withdrawn from service and a "Defective Equipment" label attached by the Supervisor and kept secure until examined by a Competent Person.
6.4
Before the expiry date shown on the label affixed to the equipment runs out, inform your Supervisor.
6.5
Do not attempt to carry out repairs on the equipment, as this must be carried out by a person appointed as competent to do so.
6.6
Use tools only for their designed purpose.
6.7
Disconnect tools when not in use.
6.8
Ensure that trailing cables are not in a position where they can be damaged, or cause a hazard.
NOTE: Finally, remember that under the Health and Safety at Work Act, you have a responsibility for the safety of yourselves and your colleagues. A procedure for the inspection and testing of portable electrical equipment is established – ensure that you comply with it.
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Electrical Safety Procedure
SECTION I GENERATING PLANT
1.0
Static Generators
1.1
Precautions Before Carrying out Maintenance The following requirements are applicable to both high and low voltage machines. High voltage units however, shall be isolated and earthed as described in Section E3. Small generators are outlined in Section H, but the maintenance guidelines for internal combustion engines/battery starting shall apply. 1
Before any work is carried out, the prime mover shall be effectively inhibited from starting. Depending on the type of unit this shall be achieved by: 1
Isolating and locking off any control valves (and vane controls with respect to water turbines).
2
Isolating the fuel lines for any internal combustion engines.
3
Isolating and bleeding the gas from gas engines.
In addition: Air start systems shall have the receiver isolated and drained down with any associated motor driven compressor isolated. Battery start units shall have the charging circuit isolated and the battery(s) leads disconnected. (Any lead connected to frame shall be removed first). 2
The following additional precautions shall also be adopted, where applicable, before carrying out the work. 1
The generator shall be at rest.
2
The field coils, where energised from an independent source shall be isolated. If that source is from a motor driven exciter, that motor shall be isolated.
3
Any control circuits associated with the plant shall be effectively isolated.
4
Caution Notices shall be displayed.
Always refer to manufacturer's instructions regarding any further safety precautions that may be deemed necessary. 2.0
Mobile Generators The following guidance notes refer to mobile generating plant. Only an Authorised Person appointed to do so shall install temporary generators for supplying fixed/temporary installations (small portable generators for tools etc are covered in Section H Portable Electrical Equipment).
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Electrical Safety Procedure
1
Generators may be required for the following purposes 1
An alternative source of electrical power in the event of a mains supply failure (emergency generation).
2
For supplying installations where no main supply is available eg construction sites.
Small generators of a portable nature, usually no greater than 5 kW rating, comprising a 110V output, are commonly used for supplying lighting sets, drilling machines etc in locations where no mains supply exists. 2.1
Generators for Private Emergency Generation Facilities for emergency generation should be planned, installed and used so that possible dangers to persons from electric shock, burn and fire are prevented. Precautions should also be taken to ensure that the main electricity supply network cannot become charged from a consumer's generator. Key elements in preventing danger from the use of generators are:
2.2
1
The need for transfer switching to prevent the mains electricity network, which may be temporarily dead, being made live from the generator and to prevent the same network which may be live from being connected to the generator.
2
The need to ensure that no live connections that can be touched eg contact pins of plugs and sockets, are made alive either from the generator or the public mains supply.
3
A safe means to cut off the power supplied by the generator.
4
The use of cables and other components which are suitable for their duty.
5
Suitable overload/short circuit protection.
6
Attention to the needs for bonding and earthing.
Transfer Switching It is recognised that not all sites will have provision for transfer switching, but it is recommended that such facilities are provided on sites where there is an operational requirement to install generators in the event of a power outage. The switching equipment should be clearly labelled to facilitate correct operation. Switches should be capable of being locked in the 'off' position for the purpose of isolation. If two separate switches are used, then they must be interlocked by mechanical means or the use of a single transferable key (non-masterable) to ensure that only one switch can be closed at any time. Transfer switching equipment should always operate reliably: 1
To disconnect the mains supply before connection of the generator.
2
To disconnect the generator from the load before reconnection of the mains supply.
3
To prevent connection of the generator terminals to the mains supply.
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Electrical Safety Procedure
2.3
Connections/Cables and Components Generators ideally should be connected via a BS 4343 appliance inlet suitably rated in addition to the transfer switch. The inlet should be accessible and as close as possible to the transfer switch arrangement. Cables from the generator should be robust and laid in such a manner not to cause hazards, avoid trailing in walkways and keep the route as short as possible. All cables shall be mechanically protected against damage.
2.4
Bonding and Earthing When a generator is used to supply a whole or part of an installation, the level of safety must satisfy that which would be required from the normal mains supply. To achieve this, attention must be drawn to earthing and the need for bonding and earthing all metallic enclosures in accordance with the current IEE Regulations (BS 7671). One pole of a single phase generator or the star point of a three phase generator should be connected to the consumer earthing terminal, either directly or via the consumer's existing main earthing lead provided it is of adequate size. It may be convenient to make the connection of the one pole of the single phase generator or the star point of the three phase set at the transfer switch rather than at the generator terminal block. All external metalwork including the generator frame, conduit trunking, cable armouring, transfer switch enclosures etc shall be bonded to the consumer main earth lead/earthing terminal, again either directly or indirectly. The way in which the consumer earthing terminal is connected to true earth depends on the supply system adopted. There are significant variations in this respect between separate neutral and earth system, combined neutral and earth systems and rural supplies. For these reasons and the effects that distribution system faults may have, it is strongly recommended that an additional local earth mat/electrode should be provided by the user of the generator. The most effective method is to drive an earth rod into the ground. The rod resistance should not exceed 20 ohms to earth.
2.5
Where no Transfer switch is Available This activity must be subject to a risk assessment with the development of a safe system of work for each individual task.
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Electrical Safety Procedure
SECTION J AVOIDING DANGER FROM BURIED ELECTRICITY CABLES, METALLIC PIPEWORK AND OVERHEAD LINES
1.0
Electricity Cables Many accidents occur when live buried electricity cables are damaged during excavation work. Employers, employees, cable owners and those concerned with planning, organising and supervising excavation, have a duty to follow a safe system of work. Site surveys shall be carried out using cable location equipment. Site service drawings shall be examined and the location of all services identified shall be marked onto drawings. NB: All work to be done in compliance with HSG47 – Avoiding Danger from Underground Services.
2.0
Metallic Pipework Where mains water pipes are replaced with plastic alternatives the earthing integrity for the building shall be checked. Gas and water services shall not be used as protective earth electrodes in accordance with BS 7671 Wiring Regulations. In circumstances where metallic pipework is disconnected or cut, danger may arise due to the interruption of earth fault currents. To minimise this risk, an approved temporary connector must be attached and a satisfactory contact established before the pipe is disconnected or cut. ONLY APPROVED CONNECTORS (Temporary Earth Safety Loops – TESL'S) SHALL BE USED AS THE INTEGRITY OF THE CONNECTION SHOULD SATISFY THE LIKELY MAGNITUDE OF FAULT CURRENT. It should also be appreciated that a sound temporary connector is not only protecting those working on the particular section of pipework, but would also be safeguarding personnel at any installation where the integrity of the electrical service earthing was inferior.
3.0
Overhead Lines All work near to overhead electric lines must be carried out in compliance with Health and Safety Executive Guidance note GS6 "Avoidance of Danger from Overhead Electric Lines". NOTE: Isolation remains the preferred option. NOTE: The risk assessment process will allow identification and elimination/reduction of risks associated with the above activities and not covered by generic process.
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Electrical Safety Procedure
SECTION K WORK ON ELECTRICAL EQUIPMENT IN POTENTIALLY EXPLOSIVE ATMOSPHERES
1.0
If electrical equipment is used where a flammable or explosive atmosphere is likely to occur, the equipment shall be so constructed that it is not liable to ignite that atmosphere.
2.0
All equipment shall be as recommended in the Health & Safety Executive and British Standards.
3.0
Uncertified electrical equipment shall not be used.
4.0
The maintenance and repair of explosion protected equipment is a specialised field of work and should be undertaken only by those who have the necessary training and experience.
All work shall be carried out in accordance with the Dangerous Substances and Explosive Atmospheres Regulations 2003.
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Electrical Safety Procedure
UNIVERSITY OF SHEFFIELD
APPENDIX 1
UNIVERSITY OF SHEFFIELD DANGER NOTICE
THE FOLLOWING WORK IS IN PROGRESS AND THE UTMOST WATCHFULNESS MUST BE OBSERVED DO NOT APPROACH UNLESS INSTRUCTED TO DO SO BY AN AUTHORISED PERSON
SAMPLE
Plant being worked on: ........................................................................................................................................... Exact position of work: ........................................................................................................................................... ........................................................................................................................................................................................... ........................................................................................................................................................................................... ........................................................................................................................................................................................... Date and time work commences: ....................................................................................................................... Competent Person (Electrical) in charge: .......................................................................................................
This form must be completed in ink
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Electrical Safety Procedure
UNIVERSITY OF SHEFFIELD
APPENDIX 2
UNIVERSITY OF SHEFFIELD CAUTION NOTICE
THE FOLLOWING WORK IS IN PROGRESS AND THE UTMOST WATCHFULNESS MUST BE OBSERVED. DO NOT INTERFERE UNLESS INSTRUCTED TO DO SO BY AN AUTHORISED PERSON
SAMPLE Location: ....................................................................................................................................................................... Plant being worked on: ........................................................................................................................................... Exact position of work: ........................................................................................................................................... ........................................................................................................................................................................................... ........................................................................................................................................................................................... ........................................................................................................................................................................................... Date and time work commences: ....................................................................................................................... Competent Person (Electrical) in charge: .......................................................................................................
This form must be completed in ink
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Electrical Safety Procedure
UNIVERSITY OF SHEFFIELD
APPENDIX 3
PERMIT TO WORK ON HIGH VOLTAGE ELECTRICAL SYSTEM Location ......................................................................................................................................................................... ISSUE to .......................................................................
of .......................................................................................
for the following work to be carried out........................................................................................................... ........................................................................................................................................................................................... ........................................................................................................................................................................................... It is safe to work on the following equipment which is dead, isolated from all live conductors and connected to earth: ........................................................................................................................................................................................... ...........................................................................................................................................................................................
SAMPLE TREAT ALL OTHER EQUIPMENT AS LIVE
The points of isolation are: .................................................................................................................................... ........................................................................................................................................................................................... The circuit main earths are: ................................................................................................................................... ........................................................................................................................................................................................... Additional safety precautions taken are (Caution Notices and padlocks etc): .................................. ........................................................................................................................................................................................... Signed:.............................................................................. Senior Authorised Person (Electrical)
Date:
........................... Time: .........................
RECEIPT I accept responsibility for carrying out the work described on this Permit to Work and declare that no other equipment will be worked on by me or any person working under my control. Signed:..............................................................................
Date:
........................... Time: .........................
CLEARANCE The work detailed above has been completed/suspended* and all persons under my control have been withdrawn and warned that it is no longer safe to work on the equipment. All tools and additional earths have been removed. Signed:..............................................................................
Date:
........................... Time: .........................
CANCELLATION This Permit to Work is hereby cancelled. Signed:.............................................................................. Senior Authorised Person (Electrical) *Delete as applicable Issue 2, (Rev2) Feb 2014 Estates & Facilities Management
Date:
........................... Time: .........................
Electrical Safety Procedure
UNIVERSITY OF SHEFFIELD
APPENDIX 4
CERTIFICATE OF ISOLATION 1
ISSUE to ..............................................................
of .......................................................................................
I certify that the following equipment has been isolated:.................................................................. .................................................................................................................................................................................. .................................................................................................................................................................................. Work to be carried out is: ............................................................................................................................. .................................................................................................................................................................................. .................................................................................................................................................................................. TREAT ALL OTHER EQUIPMENT AS LIVE The points of isolation are: ........................................................................................................................... .................................................................................................................................................................................. .................................................................................................................................................................................. The isolated equipment is/is not* earthed at : ......................................................................................
SAMPLE
.................................................................................................................................................................................. .................................................................................................................................................................................. Signed:..................................................................... Date: Authorised/Senior Authorised Person* (Electrical)
........................... Time: .........................
RECEIPT I accept responsibility for all safety measures necessary to ensure the safety of myself and my working party whilst working on/near* the equipment detailed on this Certificate. Signed:..................................................................... 2
Date:
........................... Time: .........................
CLEARANCE a) I hereby declare that I and my working party have removed all tools, gear and earthing connections not specified in part 1 of this Certificate from the apparatus detailed above. All men have been warned it is no longer safe to work on this apparatus. The system/equipment* detailed in part 1 has been/has not been* modified, ……………………….. have been advised in writing of the modifications carried out. b) All work has been completed near the equipment/system* detailed above and all have been warned that the equipment/system* must be treated as "LIVE". *Delete paragraph a) or b) as applicable. Signed:.....................................................................
Date:
........................... Time: .........................
CANCELLATION This Certificate of Isolation is hereby cancelled. Signed:..................................................................... Date: Authorised/Senior Authorised Person (Electrical)
........................... Time: .........................
*Delete as applicable
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Electrical Safety Procedure
UNIVERSITY OF SHEFFIELD
APPENDIX 5
SWITCHING SCHEDULE
Department: ................................................................................................................
Address:
...............................................................................................................................
Senior Authorised Persons (Electrical): Produced by:
Name: .......................................................................... Signature: ..................................................................................
Date:
..............................................
Checked by:
Name: .......................................................................... Signature: ..................................................................................
Date:
..............................................
Received by:
Name: .......................................................................... Signature ..................................................................................
Date:
..............................................
Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Location
Circuit Name
Action
SAMPLE
Safety Documents Issued: Type
Issue 2, (Rev2) Feb 2014 Estates & Facilities Management
Reference
Electrical Safety Procedure
Date
Time
Signature
UNIVERSITY OF SHEFFIELD
APPENDIX 6
SANCTION FOR TEST ON HIGH VOLTAGE ELECTRICAL SYSTEM Location: ........................................................................................................................................................................ ISSUE to .......................................................................
of .......................................................................................
for the following test to be carried out ............................................................................................................. ........................................................................................................................................................................................... It is safe to carry out tests on the following equipment which is dead, isolated from all live conductors and connected to earth: ........................................................................................................................................................................................... ........................................................................................................................................................................................... TREAT ALL OTHER EQUIPMENT AS LIVE The points of isolation are: ....................................................................................................................................
SAMPLE
........................................................................................................................................................................................... The circuit main earths are: ................................................................................................................................... ........................................................................................................................................................................................... These earths may be removed temporarily for the purpose of the tests.
Additional safety precautions taken are (Caution Notices and padlocks etc): .................................. ........................................................................................................................................................................................... Signed:.............................................................................. Senior Authorised Person (Electrical)
Date:
........................... Time: .........................
RECEIPT I accept responsibility for carrying out the tests described on this Sanction for Test and declare that no other equipment will be worked on by me or any person working under my control. Signed:..............................................................................
Date:
........................... Time: .........................
CLEARANCE The tests detailed above have been completed/suspended* and all persons under my control have been withdrawn and warned that it is no longer safe to work on the equipment. All test equipment, tools and additional earths have been removed. Signed:..............................................................................
Date:
........................... Time: .........................
CANCELLATION This Sanction for Test is hereby cancelled. Signed:.............................................................................. Senior Authorised Person (Electrical) *Delete as applicable
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........................... Time: .........................
Electrical Safety Procedure
UNIVERSITY OF SHEFFIELD
APPENDIX 7
LIMITATION OF ACCESS TO HIGH VOLTAGE AREAS This form must not be used for work on apparatus for which a Sanction for Test or Permit to Work is required. Location: ........................................................................................................................................................................ ISSUE to .......................................................................
of .......................................................................................
for the following work to be carried out........................................................................................................... ........................................................................................................................................................................................... ........................................................................................................................................................................................... ........................................................................................................................................................................................... NO OTHER WORK TO BE CARRIED OUT
SAMPLE
Access is permitted to the following area: ...................................................................................................... ........................................................................................................................................................................................... ........................................................................................................................................................................................... Safety precautions to be observed are: ............................................................................................................ ........................................................................................................................................................................................... ........................................................................................................................................................................................... Signed:.............................................................................. Date: Senior Authorised/Authorised Person (Electrical)
........................... Time: .........................
RECEIPT I understand the limits of access allowed and declare that only the work described above will be carried out by me or any person under my control. Signed:..............................................................................
Date:
........................... Time: .........................
CLEARANCE The work detailed above has been completed/suspended* and persons working under my control have been withdrawn from the area to which access was allowed. Signed:..............................................................................
Date:
........................... Time: .........................
CANCELLATION This Limitation of Access is hereby cancelled. Signed:.............................................................................. Date: Authorised/Senior Authorised Person (Electrical) *Delete as applicable
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Electrical Safety Procedure
UNIVERSITY OF SHEFFIELD
APPENDIX 8
CERTIFICATE OF AUTHORISATION I hereby certify that:..................................................................................................................................................................................... Name Being .................................................................................................................................................................... Position Employed In............................................................................................................................................... Department Is Appointed ................................................................................................................................................. As Defined in the Electrical Safety Procedures
Specific class of work for which authorised:-
SAMPLE Specific area or section of University for which authority is granted:-
Permits to work can be issued by the above individual for work to be carried out on the following apparatus only:-
Signed .............................................................................................................................. on behalf of the University Signature of Holder ......................................................................................................................................................... Date of Receipt.................................................................................................................................................................. Date of Expiry ....................................................................................................................................................................
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Electrical Safety Procedure
UNIVERSITY OF SHEFFIELD
APPENDIX 9
Electrical Engineering Authorised Persons - University of Sheffield SAP: Senior Authorised Person as defined in Electrical Safety Procedures - able to authorise HV & LV Permits AP: Authorised Person as defined in Electrical Safety Procedures - able to authorise LV permits and draft HV permits for authorisation.
Name
Telephone
Designation
Authorisation
Training Required
Gary Robinson
0114 2229208 07876 545807
Electrical Engineer
SAP
HV Authorised
Bryan Armitage
0114 2229028 07768 274248
Electrical Engineer
SAP
HV Authorised
Nick Cartwright
0114 2229195 07876 390740
Technical Services Manager
AP
HV Authorised
Matthew Godber
0114 2229108 07775 546213
Energy Engineer
AP
HV Training Required
Andy Connelly
0114 2229084 07787 842940
Electrical Engineer
AP
HV Training Required
Note: No works to Proceed on HV without specific authorisation of SAP or suitably qualified AP
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Electrical Safety Procedure
UNIVERSITY OF SHEFFIELD
APPENDIX 10
Electrical Technicians and Electricians/Competent Persons - University of Sheffield (Competent Person as defined in Electrical Safety Procedures with authorisation on Low Voltage operations and LV permits to Work) Name
Telephone
Designation
Authorisation
Andy Gilligan
07778 603269
Electrical Technician
Competent Person
John Bark
07795 291862
Electrical Technician
Competent Person
Tony Simpson
07917 581538
Electrical Technician
Competent Person
Steve Buckley
07901 515067
Electrical Technician
Competent Person
Dave Astridge
0114 2229146 07876 390736
Electrical Supervisor
Competent Person
Rob Wragg
07789 982111
Electrical Technician
Competent Person
Adrian Shackshaft
07876 390749
Electrical Technician
Competent Person
Chris Clayton
07876 390743
Electrical Technician
Competent Person
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Electrical Safety Procedure
