IEC 61557-16/NP IEC:201x 1 2 3 4 5 6 7
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ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1 000 V AC AND 1 500 V DC – EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTECTIVE MEASURES – Part 16: Equipment for testing the effectiveness of the protective measures of electrical equipment described in IEC 62638 and/or medical electrical equipment described in IEC 62353
8 9
FOREWORD
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and nongovernmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
44 45 46
International Standard IEC 61557-16 has been prepared by subcommittee WG8: MEASURING AND MONITORING EQUIPMENT FOR TESTING PROTECTIVE DEVICES IN ENERGY DISTRIBUTION SYSTEMS, of IEC technical committee TC85:
47
The text of this standard is based on the following documents:
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
FDIS
Report on voting
XX/XX/FDIS
XX/XX/RVD
48 49 50
Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table.
51
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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The committee has decided that the contents of this publication will remain unchanged until the stability date 1 indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be
55 56 57 58 59
• • • •
reconfirmed, withdrawn, replaced by a revised edition, or amended.
60
INTRODUCTION
61 62 63 64 65
This Part 16 of IEC 61557 defines performance requirements for measuring equipment using measuring methods described in IEC 62353 and in IEC 62638, especially for evaluation of leakage currents within electrical equipment. It is the intention of this standard to achieve comparable measuring results, additional safety for the testing person and negligible electrical stress for the unit under test.
66
1
67 68 69 70
Part 16 of IEC 61557 defines performance requirements for test and measurement equipment to determine the effectiveness of the protective measures of electrical measures for electrical equipment described in IEC 62638 and/or medical electrical equipment described in IEC 62353.
71
2
72 73
IEC 61010-1:2010, Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 1: General requirements
74 75 76
IEC 61010-031:2008, Safety requirements for electrical equipment for measurement, control and laboratory use - Part 031: Safety requirements for hand-held probe assemblies for electrical measurement and test
77 78 79
IEC 61010-2-030: 2010, Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 2-030: Particular requirements for testing and measuring circuits
80 81 82
Safety requirements for electrical equipment for IEC 61010-2-032: 66/457/CDV 2 measurement, control, and laboratory use - Part 2-032: Particular requirements for HANDHELD and hand-manipulated current sensors for electrical test and measurement
83 84 85
IEC 61557-1:2007, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 1: General requirements
86 87 88
IEC 61557-2:2007, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 2: Insulation resistance.
Scope
Normative references
————————— 1 The National Committees are requested to note that for this publication the stability date is .... 2 Status 66/457/CDV: 2011-7, End of Voting is 2012-03-09
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89 90 91
IEC 61557-4:2007, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 4: Resistance of earth connection and equipotential bonding
92 93 94 95
IEC 61557-10:2000, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures Part 10: Combined measuring equipment for testing, measuring or monitoring of protective measures
96 97 98 99
IEC 61557-13:2011, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures Part 13: Hand-held and hand-manipulated current clamps and sensors for measurement of leakage currents in electrical distribution systems
100
IEC 60529:2001, Degrees of protection provided by enclosures (IP Code)
101 102
IEC 62353, Medical electrical equipment - Recurrent test and test after repair of medical electrical equipment
103
IEC 62638 3, Recurrent test and test after repair of electrical equipment
104
3
105 106 107
For the purpose of this document, the terms and definitions given in IEC 61557-1, IEC 615572, IEC 61557-4, IEC 61557-10 and, if applicable, IEC 61557-13 apply and in addition the following.
108 109 110 111
3.1 test socket outlet socket outlet on the test equipment for the unit under test, separated from the active parts of the mains circuit by DOUBLE INSULATION
112 113 114
3.2 test terminal terminal used independently, in parallel or in combination with the test socket
115 116 117
3.3 mains socket outlet socket outlet on the test equipment used to supply mains to the equipment under test
118 119 120 121
3.4 combined test-mains socket outlet socket outlet on the test equipment that can be switched to either test-condition and/or supply condition
122 123 124 125
3.5 service socket socket outlet on the test equipment to supply mains to further test equipment or additional equipment
126 127 128 129
3.6 measuring circuit MD measuring circuit with defined components and defined frequency characteristic according to IEC 62353, Annex C, Figure C.1
Terms and definitions
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3.7 measuring circuit M measuring circuit with defined frequency characteristic according to IEC 62353, Annex C, Figure C.1 but with an impedance ≤ 5 Ω
134
4
135
4.1
136
The measuring equipment shall be capable of measuring at least the following quantities:
137
–
resistance of protective bonding and/or protective earth,
138
–
insulation resistance,
139
–
protective conductor current and/or equipment leakage current,
140
–
touch current and/or applied part leakage current.
141 142 143
The operating uncertainty for all measured parameters within the required ranges or in case of leakage current measurements at the applicable limits according to IEC 62638 or IEC 62353 shall be ± 15 % at the maximum.
144 145 146 147
If external current clamps are connected to the test equipment, they shall comply with the requirements of IEC 61557-13 and their operating uncertainty shall be included. In case of current clamps of class 2 and class 1 and external magnetic fields of 30 A/m and 100 A/m the overall operating uncertainty is extended to ± 20 % and ± 30 % at the maximum.
148 149 150
The operating uncertainty shall be determined according to IEC 61557-1 with the influence quantities E 1 , E 2 , E 3 , E 9 modified, E 11 , E 12 , and, if applicable, E 13 , E 14 , E 15 according to IEC 61557-13.
151
4.1.1
152 153 154
The measuring equipment shall be in compliance with IEC 61557-4. The withstand capability against extraneous voltages is not required if the test equipment is not intended to test fixed installed or permanently connected equipment.
155 156 157 158
The measuring circuit shall be separated from the active parts of mains by DOUBLE or REINFORCED INSULATION according to IEC 61010-1.The protective conductor may be connected but parallel earth connections shall be indicated and/or taken into account by the test equipment.
159 160
In case of calibrated detachable test leads, the calibration shall be indicated and the indication shall continue as long as the calibration is valid.
161 162 163 164
The measuring range shall include the values between 0,05 Ω and 1,99 Ω and the display shall have a minimum resolution of 0,01 Ω. Within the range of 0,1 Ω and 1,99 Ω, the measuring current shall not be below 0,2 A. The operating uncertainty shall be within the limits of 4.1.
165 166
Continuous measurements shall be possible for measuring currents below 5 A. For higher currents a limitation is allowed after a specified time or by a temperature control.
167
4.1.2
168 169 170
The measuring equipment shall be in compliance with IEC 61557-2. The withstand capability against extraneous voltages is not required if the test equipment is not intended to test fixed installed or permanently connected equipment.
Requirements General requirements
Measurement of resistance of protective bonding or protective earth resistance
Measurement of insulation resistance
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The measuring range shall include the values between 100 kΩ and 100 MΩ and the operating uncertainty shall be within the limits of 4.1.If the test equipment is not intended to test applied parts type F according to IEC 62353, the measuring range is limited to 10 MΩ.
174 175
The measuring circuit shall be separated from the active parts of mains by DOUBLE or REINFORCED INSULATION according to IEC 61010-1.
176 177
4.1.3
178 179
If the test equipment includes the alternative method, the following requirements for the measuring circuit apply:
180
–
sinusoidal test voltage at mains frequency,
181
–
test voltage between 25 V and 250 V,
182
–
current measuring range between 0,02 mA and 19,99 mA at the minimum,
183
–
minimum resolution 0,01 mA,
184
–
current measuring circuit M,
185
–
output current limitation to 3,5 mA for test voltages above 50 V,
186
–
recalculation of the measuring result up to the nominal supply voltage.
187 188
If the test equipment is intended only for tests according to IEC 62638, the lower limit of the measuring range may be increased to 0,2 mA and the resolution to 0,1 mA.
189 190 191
The requirements for operating uncertainty according to 4.1 shall be fulfilled within the specified range but at least at the applicable limits for the leakage currents according to IEC 62628 or IEC 62353.
192 193
The measuring circuit shall be separated from the active parts of mains by DOUBLE or REINFORCED INSULATION according to IEC 61010-1.
194 195
4.1.4
196 197
If the test equipment includes the alternative method, the following requirements for the measuring circuit apply:
198
–
sinusoidal test voltage at mains frequency,
199
–
test voltage between 25 V and 250 V,
200
–
current measuring range between 0,02 mA and 19,99 mA at the minimum,
201
–
minimum resolution 0,001 mA,
202
–
current measuring circuit M,
203
–
output current limitation to 3,5 mA for test voltages above 50 V,
204
–
recalculation of the measuring result up to the nominal supply voltage.
205 206
If the test equipment is intended only for tests according to IEC 62638, the lower limit of the measuring range may be increased to 0,1 mA and the resolution to 0,01 mA.
207 208
The measuring circuit shall be separated from the active parts of mains by DOUBLE or REINFORCED INSULATION according to IEC 61010-1.
Measurement of protective conductor current and/or equipment leakage current with the alternative method
Measurement of touch current, patient leakage current and applied part leakage current with the alternative method
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209 210
4.1.5
Measurement of protective conductor current and or equipment leakage current with the direct method or differential method (residual method)
211 212
If the test equipment includes the direct method or differential method the following requirements apply:
213
–
measurement in both polarities of mains supply voltage in case of single phase equipment,
214
–
current measuring range between 0,02 mA and 19,99 mA at the minimum,
215
–
minimum resolution 0,01 mA,
216
–
current measuring circuit M,
217 218 219
–
measurement of r.m.s values up to a peak factor 2 at the minimum taking into account the required frequency characteristic according to Figure C.1 of IEC 62353: In case of differential method the lower limit of frequency range is 40 Hz.
220 221
If the test equipment is intended only for tests according to IEC 62638, the lower limit of the measuring range is increased to 0,1 mA and the resolution to 0,1 mA.
222 223
The test equipment shall provide additional protective means against electric shock or fire in case of faulty units under test.
224 225 226
In case of automatic test sequences the unit under test shall not be connected to the supply voltage as long the applicable limits for resistance of protective bonding and insulation resistance according to IEC 62638 and IEC 62353 are exceeded.
227 228
In case of non-automatic test sequences the test equipment shall indicate or display a warning to be aware of connection to the mains supply
229 230 231 232 233 234
If external current clamps are used for measurements according to IEC 62638, they shall comply with the requirements of IEC 61557-13 and their operating uncertainty shall be included. The lower limit of measuring range may be increased to 1 mA. In case of current clamps of class 2 and class 1 and external magnetic fields of 30 A/m and 100 A/m, the overall operating uncertainty may be extended to 20 % and 30 %. Leakage currents shall be evaluated according to the frequency characteristic of measuring circuit M beginning at 40 Hz.
235 236
4.1.6
237 238
If the test equipment includes the direct method or differential method, the following requirements apply:
239
–
measurement in both polarities of mains supply voltage in case of single phase equipment
240
–
current measuring range between 0,01 mA and 1,999 mA at the minimum
241
–
minimum resolution 0,001 mA
242
–
current measuring circuit MD
243 244 245
–
measurement of r.m.s values up to a peak factor of 2 at the minimum taking in account the required frequency characteristic according to IEC 62353. In case of the differential method, the lower limit of frequency range shall be 40 Hz.
246 247
If the test equipment is intended only for tests according to IEC 62638, the lower limit of the measuring range may be increased to 0,1 mA and the resolution to 0,01 mA.
248 249
The test equipment shall provide additional protective means against electric shock and fire in case of faulty units under test.
250 251 252
In case of automatic test sequences, the unit under test shall not be connected to the supply voltage as long the applicable limits for resistance of protective bonding and insulation resistance according to IEC 62638 and IEC 62353 are exceeded.
Measurement of touch current, patient leakage current and applied part leakage current with the direct method or differential method (residual method)
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In case of non-automatic test sequences, the test equipment shall indicate or display a warning to make aware of connection to the mains supply.
255
4.2
256
4.2.1
257 258 259
The overload capability of test equipment shall be in compliance with the requirements of IEC 61557-10, if the test equipment is intended to test fixed installed or permanently connected equipment.
260
4.2.2
261 262
All terminals shall be designed in such a way that during connection no unintended touching of hazardous live parts is possible.
263
4.2.3
264 265 266 267 268
Sockets for the connection of further external equipment shall be clearly marked. Protection against overcurrent and short-circuits shall be provided. Protection against electric shock shall be achieved by using an RCD with a tripping current of 30 mA at the maximum. The inner wiring of the socket shall be designed according to the maximum nominal current, but at least for 16 A.
269
4.2.4
270 271
The degree of protection for the enclosure, except service-sockets and terminals, shall be at least IP40 in accordance with IEC 60529.
272
4.2.5
273 274 275
Measuring equipment intended to be hand-held during measurement shall be double insulated according to IEC 61010-1 and IEC 61010-2-030. Other equipment may be protected by protective bonding.
276
4.2.6
277 278
The resistance between protective conductor terminal and connected conductive parts including the protective conductor terminal of service-sockets shall not exceed 0,1 Ω.
279
4.2.7
280
Battery control circuits shall comply with IEC 61557-1, 4.3.
281
4.2.8
282
See IEC 61557-1, 4.10.
283
4.2.9
284
See IEC 61557-1, 4.6.
285
4.2.10
286 287
Test equipment shall comply with IEC 61010-1, IEC 61010-2-030 and, if applicable, with IEC 61010-2-032.
Construction requirements for testing equipment Overload capability
Terminals
Sockets for service purposes
Degree of protection
Class of protection
Resistance of protective bonding
Battery control
Mechanical requirements
Pollution degree
Safety
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4.2.10.1
Overvoltage category
289 290
The supply circuit of the testing equipment shall be rated at least for overvoltage category II according to IEC 61010-1.
291
4.2.10.2
292 293 294 295 296 297
Measuring circuits of the test equipment shall be rated IEC 61010-2-030. If the test equipment is not intended measuring circuits to measure resistance of protective leakage currents with the alternative method may be according to IEC 61010-2-030. External current clamps minimum.
298
4.2.11
299 300
The measuring equipment shall be in compliance with the requirements of IEC 61326-2-2 and in addition with the requirements of IEC 61326-1 for industrial locations.
301
4.2.12
302
Specified accessories shall comply with the requirements of IEC 61010-031.
303
Current clamps shall comply with IEC 61010-2-032, Type A.
304
5
305
5.1
306 307 308
In addition to the requirements of IEC 61010-1, IEC 61010-2-030, IEC 61557-1 and other applicable parts of IEC 61557, the measuring equipment shall have the following markings clearly visible:
309
–
service-socket, if applicable, with maximum rated current,
310
–
test and measurement terminals,
311
–
measuring function,
312
–
instructions for connection.
313
5.2
314 315
Additional to the requirements of IEC 61010-1, IEC 61010-2-030 and IEC 61557-1 the operating instructions shall include the following information:
316 317
–
warnings about possible hazards during connection of unit under test to the mains power supply,
318
–
operating uncertainty, intrinsic uncertainty, influencing quantities and their effect,
319
–
recommendations about intervals for recalibration.
320
6
Tests
321 322 323
Safety of measuring equipment shall be tested according to IEC 61010-1, IEC 61010-2-030, IEC 61010-2-032 and IEC 61010-31, if not otherwise stated. All tests shall be carried out under reference conditions, if not otherwise stated.
Measurement category at least for CAT II according to to test fixed installed equipment, bonding, insulation resistance or classified as secondary circuits shall be rated for CAT II at the
Electromagnetic compatibility (EMC)
Accessories
Markings and operating instructions Markings
Operating instructions
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6.1
Operating uncertainty
325 326
The percentage operating uncertainty shall be determined according to IEC 61557-1, 4.1 taking into account applicable influencing quantities according to Table 1.
327 328
The intrinsic uncertainty A shall be determined for each measured parameter under the following reference conditions (routine test):
329
–
nominal system voltage,
330
–
nominal system frequency,
331
–
reference temperature (23 °C to ± 2 °C),
332
–
reference position according to manufacturer’s specification,
333
–
nominal supply voltage or battery voltage,
334
–
no low-frequency external magnetic field,
335 336
–
specified load current for the differential method (50 % of the maximum load current or higher).
337
6.2
338
6.2.1
339 340
If applicable, the variation E 1 due to position shall be determined in positions +90° and -90° from the reference position for all measuring functions (routine test).
341
6.2.2
342 343
The variation E 2 due to supply voltage shall be determined for all measuring functions under the following conditions (routine test):
344
–
for measuring equipment with mains supply at -15 % and +10 % of the nominal voltage;
345
–
for measuring equipment with battery supply at the limits defined under IEC 61557-1, 4.3.
346
6.2.3
347 348
The variation E 3 due to temperature shall be determined for all measuring functions under the following conditions:
349
- at 0 °C and +35 °C after the equipment will have reached steady state conditions (type test).
350
6.2.4
351 352
The variation E 9 due to harmonics shall be determined for the measurement of leakage currents with the direct or differential method at:
353
–
5 % of 3. harmonic / 0° phase shift
354
–
6 % of 5. harmonic / 180° phase shift
355
–
5 % of 7. harmonic / 0° phase shift
356
In addition the variation due to the peak factor shall be determined at:
357
–
30 % of 3. harmonic/ 180° phase shift
358
–
3.4 % of 7. harmonic / 180° phase shift
359 360
The variation shall be determined at the values of all applicable limits of leakage currents according to IEC 62638 or to IEC 62353. The highest variation shall be used for calculation.
361
The percentage of harmonics shall be determined from the nominal wave (type test).
Variations Variation due to position
Variation due to supply voltage
Variation due to temperature
Variation due to harmonics
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6.2.5
Variations due to external low frequency magnetic field
363 364
The variation E 11 due to external low frequency magnetic field shall be determined at a field strength of 30 A/m , and for external current clamps according to IEC 61557-13 (type test).
365
6.2.6
366 367
The variation E 12 due to load current in case of leakage current measurements with the differential method shall be determined.
368
6.2.7
369 370
The variation E 13 due to touch current caused by common mode voltage for external clamps shall be determined according to IEC 61557-13 (type test).
371 372
6.2.8
373 374 375
Compliance with the required frequency characteristic of the measuring device according to IEC 62638, Figure C.1 shall be verified but shall not be included in the calculation of the operating uncertainty. The maximum deviation from the characteristic shall be below 3 dB.
376
6.2.9
377 378
The variation E 15 due to repeated clamping shall be determined according to IEC 61557-13 (routine test).
379
6.3
380
6.3.1
381
Compliance with requirements according to 4.1.1 shall be verified (type test)
382
6.3.2 Test of measuring circuits for measurement of insulation resistance
383
Compliance with requirements according to 4.1.2 shall be verified (type test).
384
6.3.3
385 386
Compliance with requirements according to 4.1.3, to 4.1.4, to 4.1.5 and to 4.1.6 shall be verified (type test).
387
6.4
388
6.4.1
389
Compliance with requirements according to 4.2.1 shall be verified (type test).
390
6.4.2
391
Compliance with requirements according to 4.2.2 shall be verified (routine test).
392
6.4.3
393
Compliance with requirements according to 4.2.3 shall be verified (routine test).
394
6.4.4
395
Compliance with requirements according to 4.2.4 shall be verified (type test).
Variations due to load current
Variations due to touch current caused by common mode voltage (if applicable)
Variations due to frequency of measured leakage current with direct method or differential method
Variations due to repeated clamping (if applicable)
Tests of measuring circuits according to measuring functions Test of measuring circuits for measurement of resistance of electric bonding
Test of measuring circuits for measurement of leakage currents
Test of construction requirements of test equipment Test of overload capability
Test of terminals
Test of service sockets
Test of degree of protection
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6.4.5 Test of protection class
397
Compliance with the requirements according to 4.2.5 shall be verified (type test).
398
6.4.6 Test of protective bonding
399
Compliance with the requirements according to 4.2.6 shall be verified (routine test).
400
6.4.7 Test of battery control
401
Compliance with the requirements according to 4.2.7 shall be verified (routine test).
402
6.4.8 Test of mechanical requirements
403
Compliance with the requirements according to 4.2.8 shall be verified (type test).
404
6.4.9 Test of pollution degree
405
Compliance with the requirements according to 4.2.9 shall be verified (type test).
406
6.4.10 Test of electrical safety
407
Compliance with the requirements according to 4.2.10 shall be verified (type test).
408
6.4.11
409
Compliance with the requirements according to 4.2.11 shall be verified (type test).
410
6.4.12
411
Compliance with the requirements according to 4.2.12 shall be verified (type test).
412
6.4.13
413
Compliance with the requirements according to 5.1 shall be verified (routine test).
414
6.4.14
415
Compliance with the requirements according to 5.2 shall be verified (type test).
Test of electromagnetic compatibility (EMC)
Test of accessories
Test of markings
Test of operating instructions
Table 1 – Determination of operating uncertainty
416 417 Intrinsic uncertainty or Influencing quantity
Reference conditions or specified operating range
Designation code
Type of test
6.1
R
Intrinsic uncertainty
Reference conditions
Position
Reference position ± 90° For clamps: Reference position ±30°, for any position within the clamp jaws, if no fixing device is specified
E1
85 % and 110 %
E2
6.2.2
T
E3
6.2.3
T
Mains supply voltage Battery voltage
Temperature
A
Requirements or test according to
IEC 61557-13, 4.4 and 6.2 6.2.1
T
IEC 61557-13
As specified
0 °C to +35 °C or extended range specified by the manufacturer
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th
6 % of 5 harmonic at 180° 5 % of 7 harmonic at 0° For test equipment: 30 A/m
T
IEC 61557-3, 4.1, 6.1
th
External low frequency magnetic field 15 Hz....400 Hz according to IEC 61000-4-8
6.2.7
E
11
For current clamps:
6.2.9
T
IEC 61557-13, 4.2
Operating class 1 at 100 A/m 30 A/m 10 A/m Operating class 2 at 30 A/m 10 A/m Operating class 3 at 10 A/m
Load current
Nominal range of load current according to manufacturers specification
E 12
Touch current caused by common mode voltage
Touch current through circuit A1 according to IEC 61010-1 between hand-held parts (covered with metal foil) and earth. Conductor held at maximum common mode voltage and highest rated mains frequency.
E 13
Repeatability
Difference between the highest and lowest value of the intrinsic uncertainty
E 15
6.2.10
6.2.11
T
IEC 61557-13, 4.5
6.2.13
R
IEC 61557-13, 4.5
Percentage operating uncertainty R routine test T type test A intrinsic uncertainty E n further variations, if applicable NOTE The intrinsic uncertainty A is to be determined at least at the upper and lower limit of the measuring range. Digitizing error, nonlinearity and traceability are to be taken into account. The highest value is to be used for the calculation of the operating uncertainty.
418
T
IEC 61557-13, 4.1
T
IEC 61557-16/NP IEC:201x
– 15 –
85/405/NP
419 420
Annex A (informative)
421 422
Examples of measuring circuits according to IEC 62353 and IEC 62638
423
Under consideration
