Metering Requirements for Electrical Installations
Counties Power Limited 14 Glasgow Road Private Bag 4 PUKEKOHE 2340
Telephone Fax
0800 100 202 (09) 237-0320
Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations Contents 1.0 2.0 3.0 4.0
Safety............................................................................................................... 1 General Requirements ..................................................................................... 2 Booking Inspection, Metering and Livening ...................................................... 3 General Meter Enclosure Installation Requirements ........................................ 5 4.1 4.2
5.0
Builders Temporary Supply (BTS) Requirements .............................................. 7 5.1 5.2 5.3 5.4
6.0
Urban Areas ...........................................................................................................8 Rural Areas .............................................................................................................8
Current Transformer (CT) Metering ................................................................. 9 Import / Export Metering ...............................................................................10 Power Factor Standards .................................................................................10 9.1 9.2 9.3
10.0
Metering ................................................................................................................7 Special Requirements Relating To BTS Installations .................................................7 Overhead Supplies ..................................................................................................7 Underground Supplies ............................................................................................7
Service Mains................................................................................................... 8 6.1 6.2
7.0 8.0 9.0
Metering ................................................................................................................5 Installation .............................................................................................................6
General ................................................................................................................ 10 Motor Correction.................................................................................................. 10 Automatic Control ................................................................................................ 11
Motors ...........................................................................................................12 10.1 10.2 10.3 10.4
Recommended Maximum Size – Single Phase ....................................................... 12 Power Factor Correction ....................................................................................... 12 Motor Starting Requirements ............................................................................... 12 Limiting of Motor Starting Current ........................................................................ 12
Wiring Diagrams ..........................................................................................................14 3641 3643 3639 3705 3706 3645 3650 3649 3652 3653 667 672
Single Phase – No Controlled Load ........................................................................ 14 Single Phase Domestic with Control & Peak Saver Rate Urban ............................... 14 Single Phase + Controlled Load – Urban Area ........................................................ 14 Two Phase inc Controlled Load – Urban Area ........................................................ 14 Two Phase + Controlled Load – Urban Area ........................................................... 14 Two Phase Domestic + 2 Controlled Circuits .......................................................... 14 Three Phase Domestic inc Controlled Load – Rural ................................................ 14 Three Phase Controlled & Uncontrolled– Urban .................................................... 14 Three Phase + One Phase Controlled – Rural ......................................................... 14 Three Phase Uncontrolled Load ............................................................................ 14 CT Operated Metering With 10 Way Test Block ..................................................... 14 CT Operated Metering With 13 Way Test Block ..................................................... 14
Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations 1.0
Safety The installer shall hold a current Practicing License. The installer shall comply with all Occupational Health and Safety requirements. All installations shall comply with the requirements of the current Electricity Regulations. The installer shall observe all recommendations and safety practices applicable to personnel and equipment, detailed in this manual. Recommendations and practices detailed in this manual are concerned with the prevention of personal injury and damage to equipment and property. All Current Transformers shall have their output terminals shorted, on each phase, while work is being carried out on them or their associated meter(s).
This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
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Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations 2.0
General Requirements All installations shall comply with the requirements of the current Electricity Regulations. All meter boards shall be positioned so as to provide unrestricted access for the reading and maintenance of the meters and installation. Where possible the location of the meter board should be selected taking into account the owners future plans for the development of the property, particularly in regard to fencing and security. All hot water loads shall be controlled, unless agreed otherwise with Counties Power Limited. All meter boards shall be wired ready for metering and load control equipment installation, as shown in the relevant drawings. All meter board wiring shall be minimum 2.5mm² stranded copper, including neutrals. For three phase meter installations, wiring may be colour coded as follows:
Ÿ Red for red phase Ÿ White for white phase Ÿ Blue for blue phase Installers are reminded that, where pilot wire control is used, the pilot wire carries pilot control current only to the control contactor. Any wiring from the contacts of the contactor to the load is a load carrying circuit and must be sized and fused accordingly.
IF IN DOUBT, PLEASE ASK
This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
Page 2
Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations 3.0
Booking Inspection, Metering and Livening Prior to booking an Inspection, Metering and Livening for an installation, Counties Power Limited must be in receipt of a signed Network Connection form (accompanied by any required Capital Contribution payment). The above process will result in the issuing of an ICP Number for the installation. All requests for an Inspection, Metering and Livening of an installation must be made to the customer’s selected Retailer. Counties Power Limited cannot receive requests directly from the Customer (or their electrician) and can only action an Inspect, Meter & Livening on instruction from an appropriate Retailer. The installer shall ensure that the following is in place before booking an Inspection: 1. All electrical work associated with the metering installation has been completed to enable safe livening of the installation. 2. Where the service main installation has been carried out by a contractor authorized to connect to the Counties Power Network, installation of the service main should be completed to the stage where livening may be carried out by the insertion of the service main fuse(s). Where underground cables have not been, or cannot be terminated in a pillar box due to the contractor not being authorized to connect to the Counties Power Network, these may be connected by the inspector at an additional cost. 3. A properly completed Certificate of Compliance covering the wiring of the installation to be livened is available, on site, for the Inspector. 4. If applicable, a properly completed Certificate of Compliance covering the installation of the service main to be livened is available, on site, for the Inspector. Note: Livening cannot occur until these documents have been sighted and authorized by the inspector. It is the responsibility of the electrical contractor and/or the customer booking the inspection to ensure that both COC’s, if applicable, are available to the inspector before or on arrival at site. 5. Bookings are made with the Customer’s selected Retailer.
This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
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Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations Cancellation of booked work is requested as soon as possible and should be notified to Counties Power. Where an Inspector attends to a booked inspection that is incomplete and unable to be completed then additional charges will be made direct to the customer unless an arrangement has been made to invoice the Electrical Contractor direct. Persons booking inspections should be prepared to supply the following information at the time of making the booking: 1. Name of customer (Account holder) 2. The installation ICP Number 3. Address of installation 4. Date inspection required 5. Type of installation (BTS, House, Pump, Shed etc.) 6. No of phases 7. Pole top or pillar connection required 8. Special tariff rates, if known (Thrifty nite, Peak saver etc.) 9. Helpful directions on finding the site, particularly if rural 10. Location of the installation COC 11. Location of the Service Main COC 12. Electricians name 13. Electricians contact number (preferably cell phone number) 14. Any other helpful information e.g. Special access requirements. The appropriate fees for the Inspecting, Metering and Livening will be invoiced to the Account Holder by Counties Power. Any costs associated with additional visits, where these are required due to the incompletion or non-compliance of the job or documentation on the part of the Electrical Contractor will be charged to the customer by Counties Power unless an arrangement has been made to invoice the Electrical Contractor direct.
This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
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Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations 4.0
General Meter Enclosure Installation Requirements
4.1
Metering All domestic installations shall be wired to allow for separate metering of controllable (water heating) loads. All controllable loads shall be separately metered (a single dual element meter is typically used – refer to wiring drawings). Counties Power Ltd. have a VERY STRONG PREFERENCE that external meter boxes be installed on new dwellings / buildings which will require whole current (W/C) meter(s) to be installed and livened onto the Counties Power Network. Facilities for the mounting and wiring of Counties Power meters and where applicable, control equipment, MUST comply with the following: a. For a single phase installation with or without controlled power metering, an unencumbered mounting plate, or mounting rails, with minimum dimensions of 430mm high, 360mm wide, 120mm deep (clearance from the mounting plate/rails to the inside of the closed door. b. For two phase installations with or without controlled power metering, an unencumbered mounting plate, or mounting rails, with minimum dimensions of 500mm high, 400mm wide, 120mm deep (clearance from the mounting plate/rails to the inside of the closed door. c. For three phase installations with or without controlled power metering, an unencumbered mounting plate, or mounting rails, with minimum dimensions of 500mm high, 400mm wide, 120mm deep (clearance from the mounting plate/rails to the inside of the closed door. d. For metering configurations other than those above, please contact Counties Power for minimum device mounting requirements. Counties Power Limited advise an external meter box size DCB1S, DC3S or DC4S (or equivalent dimensions) will satisfy the device mounting requirements listed in a), b), or c), above. Meter register readings must be accessible to a meter reader.
There are three acceptable internal switchboards available especially manufactured by Teubel Switchboards for the Advanced Meters in the Counties Power area:
This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
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Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations Ÿ EZMP302CD Ezywire Board/Metering and Distribution/30 Ways/2 Row/Counties Power/Deep
Ÿ EZM6CD Ezywire Board/Metering/Size 6/Counties Power/Deep Ÿ EZM4CD Ezywire Board/Metering/Size 4/Counties Power/Deep Only these boards or their equivalent will be accepted. Counties Power advise that after the 1st January 2014, new installations that are requested to be Metered and Livened onto the Counties Power Network, that DO NOT comply with the above requirements, WILL NOT BE CONNECTED. 4.2
Installation Meters shall be mounted so that the register is clearly and easily readable through the meter box window. Contact ratings of all load control devices shall be appropriate for the maximum controlled load. All protection in meter boxes shall be Close Current Protection type. Cables are permitted to be installed through the top of the meter box providing they do not restrict the installation of the meter(s) or load control devices. Looping from the meter terminals is not permitted. All meter boxes shall be mounted so that the centre of the top viewing window will be 1.4 to1.8 metres above the finished ground level.
This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
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Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations 5.0
Builders Temporary Supply (BTS) Requirements
5.1
Metering All BTS installations will be metered.
5.2
Special Requirements Relating To BTS Installations All BTS installations shall be fully protected by a Residual Current Protection device. This shall either be incorporated in the Main Switch or in the outlet(s) protection, and may be incorporated in both. All equipment shall be housed in a weatherproof box and mounted on a substantial pole. The pole shall be adequately buried, supported and suitable for long term use. The box should have a top-hinged lid and provide a cutout for the lead(s) to exit the enclosure. A separate busbar shall be provided for both neutral and earth connections. (All under one bolt is not acceptable.) All earth conductors shall be insulated or sleeved within the switchboard cavity. A driven earth electrode of standard size shall be used on every installation.
5.3
Overhead Supplies Termination structures shall be of sufficient strength and height to provide a minimum clearance of 2.7 metres, and 3.5 metres over areas used by vehicles. Mains Entry Boxes are to be used. Mains cables and earthing leads are to be adequately protected against mechanical damage.
5.4
Underground Supplies Where required, mains cables shall be left long enough to reach the installation following the removal of the BTS and shall be properly protected from mechanical damage to below ground level. A plastic marker shall be attached to indicate the presence of underground cables. ALL REQUIREMENTS IN SECTION 3 ‘BOOKING INSPECTION, METERING AND LIVENING’ SHALL APPLY TO A BTS INSTALLATION.
This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
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Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations 6.0
Service Mains
6.1
Urban Areas Supplies to urban installations shall be 1 phase, unless otherwise agreed by Counties Power Limited. In the interest of safety, Counties Power recommends that underground service cables be Neutral Screened. The Electrical Contractor shall specify the service mains sizing such that the volt drop requirements of the Electricity Regulations are satisfied (taking into account the length of the service main, the designed load and future load) except that the minimum size of a service main shall be 16mm2.
6.2
Rural Areas Supply to rural dwelling installations is recommended to be 3 phase and shall be a minimum of 2 phase. In the interest of safety, Counties Power recommends that underground service cables be Neutral Screened. The Electrical Contractor shall specify the service mains sizing such that the volt drop requirements of the Electricity Regulations are satisfied (taking into account the length of the service main, the designed load and future load) except that the minimum size of a service main shall be 16mm2. Underground long run cables of greater than 25mm2 shall be ‘tailed down’ to a size appropriate to the termination capability of the main switch (generally 25mm2 copper). The joint should be made immediately outside the foundation of the building, beneath the meter box position. Underground aluminium cables may be single core, multi stranded, providing all cables (3 phases and neutral) follow the same lay line, i.e. installed in a common trench (minimum size recommended is 70mm2). Copper tails or bi-metal lugs with copper palms shall be used to terminate cables.
This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
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Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations 7.0
Current Transformer (CT) Metering Where the maximum load is expected to exceed 100 amps then CT’s shall be used. All proposed installations requiring CT’s shall be discussed with Counties Power Limited engineering staff, at an early stage of the planning. CT’s may take up to 4 weeks to be delivered. The CT ratio to be installed, and the ratio to be used in the case of multi ratio CT’s, shall be approved by Counties Power Limited. All CT installations shall be fitted with a CT test block. All CT’s and test blocks shall be supplied by Counties Power Limited. Provision shall be made for a separate sealable CT chamber, with a removable section of busbar or cable. One set of potential fuses shall be mounted on the metering panel and loaded with 10amp cartridges. These fuses shall be mounted so as to allow the cartridge holders to be sealed so as to prevent removal (i.e. spaced apart to enable individual fuses to be sealed). Where busbars are installed, a second set of fuses shall be mounted on the busbar and loaded with 20amp cartridges. This second set of fuses shall be mounted within the sealable CT chamber in such a position that the cartridge may be safely changed without the requirement for a shutdown. All potential fuses shall be of the HRC, Q2 type. A minimum depth of 150mm is required on the meter board to accommodate the meter. All hinged meter boards shall allow 90 degree opening with the meters fitted.
This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
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Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations 8.0
Import / Export Metering Import export metering is typically implemented via specific meter programming Inverters are required to be connected to the uncontrolled supply Multi phase supply’s with distributed generation on 1 phase only should make the export phase identifiable inside the meter box via a label Refer to Counties Power specific distributed generation documentation
9.0
Power Factor Standards
9.1
General Counties Power Limited reserves the right to require the installation of reactive metering and to charge for VAr’s supplied to an installation where the mean power factor of the installation is below 0.95 lagging. All new and/or additional motors of size 0.75 kW (1 HP) and over shall be installed with power factor correction to ensure that the power factor of the motor is maintained at, or better than, 0.95 lagging. The presence of harmonics (as introduced by some electronic starters and speed controllers) may have a detrimental effect on power factor correction capacitors.
9.2
Motor Correction Recommended capacitor sizes: Motor Size (HP)
kW
3phase Amps /phase @ .95
Capacitor Size (KVA)
1.0
0.75
1.1
0.5
1.5
1.2
1.8
0.5
2.0
1.5
2.3
0.75
3.0
2.25
3.4
1.0
5.0
3.75
5.7
1.5
7.5
5.6
8.5
2.0
10.0
7.5
11.4
3.0
15.0
11.2
17.1
4.0
20.0
15.0
22.9
5.0
30.0
22.4
34.2
7.0
40.0
29.8
45.5
9.0
This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
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Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations Motor Size (HP)
kW
3phase Amps /phase @ .95
Capacitor Size (KVA)
50.0
37.3
56.9
12.0
This list applies to 1450 RPM squirrel cage motors only. Larger or special motor installations (e.g. slow speed motors) will require power factor correction designed specifically for the installation. Power factor correction will normally be wired on the motor side of the protection and control equipment. However, connection to the supply side may, in some instances, be a practical solution. Early discussion with Counties Power Limited Engineering staff is recommended. 9.3
Automatic Control In larger installations and particularly where there are a number of smaller motors installed, automatic control of a bank of capacitors supplied from the busbars may be a satisfactory alternative to distributed correction.
This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
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Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations 10.0
Motors
10.1
Recommended Maximum Size – Single Phase It is recommended that the maximum size of single phase motors connected is 1.5 kW. Where larger motors are connected, Counties Power Limited accept no responsibility for flicker or other interference caused, to the customer, by motor starting or running conditions. Where flicker or interference is caused to other customers Counties Power Limited may require that the cause of the problem be removed or rectified at the owners cost.
10.2
Power Factor Correction Power factor correction equipment shall be installed so as to maintain a mean power factor of 0.95 lagging – refer section 8
10.3
Motor Starting Requirements
10.4
Limiting of Motor Starting Current No motor shall be connected and started in such a manner that it causes interference or voltage problems. Should it be found to create these problems, or at Counties Power Limited request, the installation or starting system shall be modified at the customer’s cost. Discussions with Counties Power Engineering staff, at an early stage in the installation planning, may assist in overcoming these problems. When requested, Counties Power Engineering staff will indicate the maximum starting current available at that point in the system. In urban areas this maximum starting current may be less than the network capability due to the problem of starting flicker interference to residential customers. Providing clause 10.4 is satisfied, the following shall apply:
Ÿ Direct On Line Starters may be used for up to and including 5.0 HP multi cage low starting current motors and others approved by Counties Power Engineering staff.
Ÿ A Motor supplied from a transformer servicing that customer only, up to and including 50.0 HP, may be installed without Counties Power engineering consent.
Ÿ All motors above 50.0 HP shall only be connected with the consent of Counties Power Engineering staff
Ÿ Electronic speed control systems have the potential to introduce harmonics into the power system. Where the controlled load is a significant portion of the total load, the introduced harmonics can exceed the maximum levels This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
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Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations recommended by the Electrical Code of Practice – ECP 36. It is the customer’s responsibility to ensure that these levels are not exceeded.
Ÿ Where a number of motors are connected to the supply consideration should be given to configuring the overall control system to provide for staggered starting of motors to prevent the starting current capacity of the supply being exceeded and /or excessive voltage drop.
Ÿ Counties Power Limited Engineering staff will use the Electricity Engineers Association ‘Motor Starting Current for AC Motors’ as a guide when considering motor starters.
This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
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Reference: NW063 Version 2.2: June 2015 Authoriser: General Manager Network
Metering Requirements for Electrical Installations Wiring Diagrams 3641
Single Phase – No Controlled Load
3643
Single Phase Domestic with Control & Peak Saver Rate Urban
3639
Single Phase + Controlled Load – Urban Area
3705
Two Phase inc Controlled Load – Urban Area
3706
Two Phase + Controlled Load – Urban Area
3645
Two Phase Domestic + 2 Controlled Circuits
3650
Three Phase Domestic inc Controlled Load – Rural
3649
Three Phase Controlled & Uncontrolled– Urban
3652
Three Phase + One Phase Controlled – Rural
3653
Three Phase Uncontrolled Load
667
CT Operated Metering With 10 Way Test Block
672
CT Operated Metering With 13 Way Test Block
This document is from the Counties Power Quality Management System. Check Internet/ Intranet for the latest version.
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Q:\METERING\Landis & Gyr Smart Meters\CAD\1 Working\STD-5A-0667.dwg, 25/10/2013 12:49:36 p.m., alan.chant
COUNTIES POWER
Q:\METERING\Landis & Gyr Smart Meters\CAD\1 Working\STD-5A-0672.dwg, 25/10/2013 12:49:17 p.m., alan.chant
COUNTIES POWER
