prHD IEC 60364-6:2025

SLOVENSKI STANDARD
01-november-2025
Nizkonapetostne električne inštalacije - 6. del: Preverjanje
Low voltage electrical installations - Part 6: Verification
Installations électriques à basse tension - Partie 6: Vérification
Ta slovenski standard je istoveten z: prHD IEC 60364-6:2025
ICS:
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

64/2769/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60364-6 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-09-05 2025-11-28
SUPERSEDES DOCUMENTS:
64/2692A/CD, 64/2766/CC
IEC TC 64 : ELECTRICAL INSTALLATIONS AND PROTECTION AGAINST ELECTRIC SHOCK
SECRETARIAT: SECRETARY:
Germany Mr Wolfgang Niedenzu
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 1,SC 8B,SC 8C,TC 17,SC 17A,TC 18,TC 20,TC 22,SC
22E,SC 22G,SC 22H,TC 23,SC 23A,SC 23B,SC 23E,SC
23G,SC 23H,SC 23J,SC 23K,TC 32,SC 32B,TC 34,SC 37A,SC
37B,TC 44,TC 61,TC 69,TC 78,TC 82,TC 85,TC 95,TC 99,TC
120,TC 121,SC 121A,SC 121B,PC 128
ASPECTS CONCERNED:
Safety
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The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for Vote
(CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
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This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are
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be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC c lauses.
(SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Low voltage electrical installations – Part 6: Verification

PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
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IEC CDV 60364-6 © IEC 2025
CONTENTS
FOREWORD . 3
6.1 Scope . 5
6.2 Normative references . 5
6.3 Terms and definitions . 6
6.4 Initial verification . 7
6.4.1 General . 7
6.4.2 Inspection . 7
6.4.3 Testing . 8
6.4.4 Reporting for initial verification . 14
6.5 Periodic verification . 15
6.5.1 General . 15
6.5.2 Frequency of periodic verification . 16
6.5.3 Reporting for periodic verification . 16
ANNEX A (informative) Estimation of the resistance value likely to be obtained during
continuity testing . 18
ANNEX B (informative) Methods for measuring the insulation resistance/impedance of
floors and walls to earth or to the protective conductor . 19
ANNEX C (informative) Examples of methods to measure earth electrode resistance . 20
Method C1 – Measurement of earth electrode resistance using a three terminal
earth electrode test instrument . 20
Method C2 – Measurement of earth electrode resistance using a loop impedance
test instrument . 22
Method C3 – Measurement of earth electrode resistance using clamps . 23
ANNEX D (informative) Guidance on the application of the rules of Clause 6.4 – Initial
verification . 25
D.6.4.3.7 Protection by automatic disconnection of supply . 26
ANNEX E (informative) Model forms for reporting . 27
ANNEX F (informative) Model forms for inspection of electrical installations . 42
ANNEX G (informative) Model schedule of circuit details and test results . 55
Annex H (informative) Recommended period before the first periodic verification,
following the initial verification . 58
ANNEX I (informative) Periodic verification of an electrical installation in dwellings . 59
ANNEX J (informative) List of notes concerning certain countries . 62
Bibliography . 66

Figure C.1 – Method C1 – Measurement of earth electrode resistance using a three
terminal earth electrode test instrument . 21
Figure C.2 – Measurement of the earth electrode resistance using a loop impedance
test instrument . 22
Figure C.3 – Measurement of earth electrode resistance using clamps . 23

Table 1 – Minimum values of insulation resistance . 8
Table A.1 – Specific conductor resistance R for copper wiring at 30 °C dependent on
the nominal cross-sectional area S for calculation of conductor resistances . 17
IEC CDV 60364-6 © IEC 2025
Table H.1 – Recommended period before the first periodic verification, following the
initial verification . 57
Table I.1 – Maximum value of rated residual operating current of residual current
operating protective device as a function of earth impedance . 59
Table I.2 – Rating of overcurrent protective device versus conductors' cross-sectional
area 60
IEC CDV 60364-6 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
LOW VOLTAGE ELECTRICAL INSTALLATIONS –

Part 6: Verification
FOREWORD
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
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60364-6 has been prepared by the IEC technical committee 64:
Electrical installations and protection against electric shock.
This third edition cancels and replaces the second edition published in 2016 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Normative references updated to current publications;
b) Annex E: New model forms for reporting;
c) Annex F: New model inspection schedules
d) Annex G: New schedule of circuit details and schedule of test results
e) Annex H: Recommended period before the first periodic verification initial frequencies of
inspection of electrical installations
f) Annex I: Periodic verification of an electrical installation in dwellings
IEC CDV 60364-6 © IEC 2025
g) Annex J: Listing of notes concerning some countries;
h) Bibliography – Updated:
The text of this standard is based on the following documents:
FDIS Report on voting
64/xxxx/FDIS 64/xxxx/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60364 series, published under the general title Low voltage electrical
installations, can be found on the IEC website.
The reader's attention is drawn to the fact that Annex J lists all of the “in-some-country” clauses
on differing practices of a less permanent nature relating to the subject of this standard.
The committee has decided that the contents of this publication will remain unchanged until the
stability date 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;
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
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contents. Users should therefore print this document using a colour printer.

IEC CDV 60364-6 © IEC 2025
1 LOW VOLTAGE ELECTRICAL INSTALLATIONS –
3 Part 6: Verification
7 6.1 Scope
8 This part of IEC 60364 provides requirements for initial and periodic verification of an electrical
9 installation.
10 It provides requirements for initial verification, by inspection and testing, of an electrical
11 installation to determine, as far as reasonably practicable, whether the requirements of parts 1,
12 4, 5 and 8 of IEC 60364 have been met, and requirements for the reporting of the results of the
13 initial verification. The initial verification takes place upon the completion of a new electrical
14 installation or completion of an addition or an alteration to an existing electrical installation.
15 It provides requirements for periodic verification of an electrical installation to determine, as far
16 as reasonably practicable, whether the electrical installation and all its constituent equipment
17 are in a satisfactory condition for continued use and requirements for the reporting of the results
18 of the periodic verification.
19 6.2 Normative references
20 The following documents, in whole or in part, are normatively referenced in this document and
21 are indispensable for its application. For dated references, only the edition cited applies. For
22 undated references, the latest edition of the referenced document (including any amendments)
23 applies.
24 IEC 60079-17, Explosive atmospheres – Part 17: Electrical installations inspection and
25 maintenance
26 IEC 60364 (all parts), Low-voltage electrical installations
27 IEC 60364-4-41:2017, Low-voltage electrical installations – Part 4-41: Protection for safety –
28 Protection against electric shock IEC 60364-4-41:2005/AMD1:2017
29 IEC 60364-4-42:2010, Low-voltage electrical installations – Part 4-42: Protection for safety –
30 Protection against thermal effects
31 IEC 60364-4-42:2010/AMD1:2014
32 IEC 60364-4-43:2023, Low-voltage electrical installations – Part 4-43: Protection for safety –
33 Protection against overcurrent
34 IEC 60364-4-44:2024, Low-voltage electrical installations – Part 4-44: Protection for safety –
35 Protection against voltage disturbances and electromagnetic disturbances
36 IEC 60364-5-51:2005, Electrical installations of buildings – Part 5-51:– Selection and erection
37 of electrical equipment – Common rules
38 IEC 60364-5-52:2009, Low-voltage electrical installations – Part 5-52: Selection and erection
39 of electrical equipment – Wiring systems
40 IEC 60364-5-53:2020, Electrical installations of buildings – Part 5-53: Selection and erection
41 of electrical equipment – Isolation, switching and control
IEC CDV 60364-6 © IEC 2025
43 IEC 60364-5-54, Low-voltage electrical installations – Part 5-54: Selection and erection of
44 electrical equipment – Earthing arrangements and protective conductors
45 IEC 61557 (all parts), Electrical safety in low voltage distribution systems up to 1 000 V a.c.
46 and 1 500 V d.c. – Equipment for testing, measuring or monitoring of protective measures
47 IEC 61557-6, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500
48 V d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 6:
49 Effectiveness of residual current devices (RCD) in TT, TN and IT systems
50 6.3 Terms and definitions
51 For the purposes of this document, the terms and definitions given in IEC 60050-195 and
52 IEC 60050-826 and the following apply.
53 ISO and IEC maintain terminology databases for use in standardization at the following
54 addresses:
55 IEC Electropedia: available at https://www.electropedia.org/
56 ISO Online browsing platform: available at https://www.iso.org/obp
57 6.3.1
58 verification
59 measures of determining compliance of the electrical installation with the relevant requirements
60 of the IEC 60364 series
61 Note 1 to entry: Verification comprises inspection, testing and reporting.
62 6.3.2
63 inspection
64 examination of an electrical installation using all appropriate senses in order to ascertain correct
65 selection and proper erection of electrical equipment
66 6.3.3
67 testing
68 measurement by instrument or procedure to assess compliance of an electrical installation with
69 the IEC 60364 series
70 6.3.4
71 reporting
72 recording of the results of inspection and testing
73 6.3.5
74 maintenance
75 combination of all technical and administrative actions, including supervisory actions, intended
76 to retain an item in, or restore it to, a state in which it can perform a required function
77 [SOURCE: IEC 60050:2020 192-06-01, modified – Changed reference from management to
78 administrative duties and Note 1 to entry removed.]
IEC CDV 60364-6 © IEC 2025
80 6.4 Initial verification
81 6.4.1 General
82 6.4.1.1 Every electrical installation shall be verified during erection, as far as reasonably
83 practicable, and on completion, before being put into service.
84 6.4.1.2 The information required by IEC 60364-5-51:2005, 514.5 and other information
85 necessary for initial verification shall be made available to the person carrying out the initial
86 verification.
87 6.4.1.3 The initial verification shall include comparison of the results with relevant criteria
88 to confirm that the requirements of the IEC 60364 series have been met.
89 6.4.1.4 Precautions shall be taken to ensure that the verification shall not cause danger to
90 persons or livestock and shall not cause damage to property and equipment even if the circuit
91 is defective.
92 6.4.1.5 It shall be verified that an extension, addition or alteration to an existing electrical
93 installation conforms to the IEC 60364 series and does not impair the safety of that electrical
94 installation, and that the safety of the new electrical installation is not impaired by the existing
95 electrical installation.
96 6.4.1.6 Verification shall be made by a one or more skilled persons competent in such work.
97 6.4.1.7 Where there are multiple sources of supply, the effectiveness of protective measures
98 for each applicable combination of supplies shall be verified.
99 6.4.2 Inspection
100 6.4.2.1 Inspection shall precede testing and shall normally be done prior to energizing the
101 electrical installation.
102 6.4.2.2 The inspection shall be made to confirm that electrical equipment which is part of
103 the electrical installation is:
104 – in compliance with the safety requirements of the relevant equipment standards;
105 NOTE This can be ascertained by examination of the manufacturer’s information, marking or certification.
106 – correctly selected and erected according to the IEC 60364 series and taking into account
107 the manufacturer’s instructions;
108 – not visibly damaged or defective so as to impair safety.
109 6.4.2.3 Inspection shall include at least the checking of the following, where relevant:
110 a) method of protection against electric shock (see IEC 60364-4-41);
111 b) presence of fire barriers and other precautions against propagation of fire an d protection
112 against thermal effects (see IEC 60364-4-42 and IEC 60364-5-52:2009, Clause 527);
113 c) selection of conductors for current-carrying capacity (see IEC 60364-4-43 and IEC 60364-
114 5-52:2009, Clauses 523);
115 d) choice, setting, selectivity and coordination of protective and monitoring devices (see
116 IEC 60364-5-53:2020, Clause 535);
117 e) selection, location and installation of suitable surge protective devices (SPD) (see
118 IEC 60364-5-53:2020 and IEC 60364-5-53:2001/AMD2:2015, Clause 534);
119 f) selection, location and installation of suitable isolating and switching devices (see
120 IEC 60364-5-53:2020, Clause 536);
IEC CDV 60364-6 © IEC 2025
121 g) selection of equipment and protective measures appropriate to external influences and
122 mechanical stresses (see IEC 60364-4-42:2010, Clause 422, IEC 60364-5-51:2005, 512.2
123 and IEC 60364-5-52:2009, Clause 522);
124 h) identification of conductors (see IEC 60364-5-51:2005, Clause 514);
125 i) presence of diagrams, warning notices or similar information (see IEC 60364-5-51:2005,
126 514.5);
127 j) identification of circuits, overcurrent protective devices, switches, terminals etc. (see
128 IEC 60364-5-51:2005, Clause 514);
129 k) adequacy of termination and connection of cables and conductors (see
130 IEC 60364­5­52:2009, Clause 526);
131 l) selection and installation of earthing arrangements, protective conductors and their
132 connections (see IEC 60364-5-54);
133 m) accessibility of equipment for convenience of operation, identification and maintenance (see
134 IEC 60364-5-51:2005, Clauses 513 and 514);
135 n) measures against electromagnetic disturbances (see IEC 60364-4-44:2018, Clause 444);
136 o) exposed-conductive-parts are connected to the earthing arrangement (see
137 IEC 60364­4­41:2017, Clause 411);
138 p) selection and erection of the wiring systems (see IEC 60364-5-52:2009, Clauses 521 and
139 522).
140 q) verification of phase sequence;
141 r) requirements for stationary batteries (see IEC 60364-5-57)
142 s) requirements for energy efficiency (see IEC 60364-8-81)
143 t) requirements for Prosumer’s electrical installation (see IEC 60364-8-82)
144 Inspection shall include all particular requirements for special installations or locations.
145 6.4.3 Testing
146 6.4.3.1 General
147 The test methods described in 6.4.3 are given as reference methods; other methods are not
148 precluded, provided they give no less valid results.
149 Measuring instruments and monitoring equipment shall conform to the relevant parts of
150 IEC 61557.
151 The following tests shall be carried out where relevant and should be made in the following
152 sequence:
153 a) continuity of protective conductors (see 6.4.3.2);
154 b) insulation resistance of the wiring system (see 6.4.3.3);
155 c) insulation resistance testing to confirm the effectiveness of protection by SELV, PELV or
156 electrical separation (see 6.4.3.4);
157 d) insulation resistance testing to confirm the effectiveness of floor and wall
158 resistance/impedance (see 6.4.3.5);
159 e) verification of conductor function (see 6.4.3.6);
160 f) verification of automatic disconnection of supply (see 6.4.3.7);
161 g) verification of additional protection (see 6.4.3.8);
162 h) test of phase rotation (see 6.4.3.9);
163 i) correct operation of equipment (see 6.4.3.10);
164 j) voltage drop (see 6.4.3.11).
IEC CDV 60364-6 © IEC 2025
165 If any test shows non-compliance, that test and any preceding test, the results of which could
166 have been influenced by the fault indicated, shall be repeated after the fault has been rectified.
167 When testing in a potentially explosive atmosphere appropriate safety precautions in
168 accordance with IEC 60079-17 shall be applied.
169 6.4.3.2 Continuity of protective conductors
170 The continuity of protective conductors and connection to exposed-conductive-parts and
171 extraneous-conductive-parts, if any, shall be verified by a measurement of resistance.
172 NOTE Example values of conductor resistance are given in Annex A
173 6.4.3.3 Insulation resistance
174 The insulation resistance shall be measured between:
175 a) live conductors, and
176 b) live conductors and the protective conductor connected to the earthing arrangement.
177 Where appropriate, during the measurement between live conductors and the protective
178 conductor, live conductors may be connected together. In practice, this measurement should
179 be carried out during erection of the electrical installation before the equipment is connected.
180 The value of insulation resistance measured with the test voltages indicated in Table 1 shall be
181 considered satisfactory if the test is carried out with current-using equipment disconnected with:
182 • the main switchboard and each distribution circuit tested separately, with all its final
183 circuits connected, or
184 • the circuits tested individually
185 has an insulation resistance not less than the appropriate value given in Table 1.
186 Where the measured value of insulation resistance for circuits tested collectively is less than  2 MΩ,
187 the possibility of a latent defect exists and circuits should be tested individually.
188 NOTE Where the measured value of insulation resistance for circuit tested individually it is likely that measured
189 values will be significantly higher than 20 MΩ.
191 Table 1 – Minimum values of insulation resistance
Nominal circuit voltage Test voltage DC Minimum insulation resistance
V V M
SELV and PELV 250 0.5
Up to and including 500 V 500 1
Above 500 V 1 000 1
193 Table 1 shall also be applied for a verification of the insulation resistance between non-earthed
194 protective conductors and local earth.
195 FELV circuits shall be tested at the same test voltage as that applied to the primary side of the
196 source.
IEC CDV 60364-6 © IEC 2025
197 Where the circuit includes equipment that is likely to influence the results, or to be damaged,
198 (e.g. surge protective devices (SPDs), insulation monitoring devices (IMDs)), either:
199 - a measurement between the live conductors connected together and the protective
200 conductor shall be made; or
201 - such equipment shall be disconnected during the insulation resistance test; or
202 - where it is not reasonably practicable to disconnect such equipment (e.g. in case of
203 fixed socket-outlets incorporating a SPD) the test voltage for a particular circuit may be
204 reduced to 250 V DC but the insulation resistance shall have a value of at least 1 M .
205 Where a live part is connected to the earthing arrangement, it shall be disconnected from the
206 earthing arrangement during the measurement.
207 6.4.3.4 Measurement of insulation resistance of conductors where SELV, PELV or electrical
208 separation are applied
209 The separation of circuits shall be in accordance with 6.4.3.4.1 in the case of protection by
210 SELV, 6.4.3.4.2 in the case of protection by PELV and 6.4.3.4.3 in the case of protection by
211 electrical separation.
212 The resistance value obtained in 6.4.3.4.1, 6.4.3.4.2 and 6.4.3.4.3 shall be at least that of the
213 circuit with the highest voltage present in accordance with Table 1.
214 6.4.3.4.1 Protection by SELV
215 The separation of live parts from those of other circuits and from earth, according to IEC 60364-
216 4-41:2005, Clause 414, shall be confirmed by a measurement of the insulation resistance.
217 6.4.3.4.2 Protection by PELV
218 The separation of the live parts from those of other circuits, according to IEC 60364-4-41:2005
219 Clause 414, shall be confirmed by a measurement of the insulation resistance.
220 6.4.3.4.3 Protection by electrical separation
221 The separation of the live parts from those of other circuits and from earth, according to
222 IEC 60364-4-41:2005, Clause 413, shall be confirmed by a measurement of the insulation
223 resistance.
224 For electrical separation with more than one item of current-using equipment, it shall be verified,
225 either by measurement or by calculation, that in the case of two coincidental faults with
226 negligible impedance between different line conductors and either the protective bonding
227 conductor or exposed-conductive-parts connected to it, at least one of the faulty circuits shall
228 be disconnected. The disconnection time shall be in accordance with that for the protective
229 measure automatic disconnection of supply in a TN system.
230 In addition, in the case of electrical separation with more than one item of current -using
231 equipment, the separation from other circuits which are simultaneously accessible, or the earth
232 of the protective equipotential bonding conductor in accordance with IEC 60364-4-41:2005,
233 Clause C.3.4, shall be confirmed by measurement of the insulation resistance.
234 6.4.3.5 Measurement of insulation resistance/impedance of floors and walls
235 Where requirements of IEC 60364-4-41:2005, Clause C.1 are applied, at least three
236 measurements shall be made in the same location, one of these measurements being
IEC CDV 60364-6 © IEC 2025
237 approximately 1 m from any accessible extraneous-conductive-part in the location. The other
238 two measurements shall be made at greater distances.
239 The measurement of resistance/impedance of insulating floors and walls is carried out with the
240 system voltage to earth at nominal frequency.
241 The above series of measurements shall be repeated for each relevant surface of the location.
242 NOTE Further information on the measurement of the insulation resistance/impedance of floors and walls is given
243 in Annex B.
244 6.4.3.6 Verification of conductor function
245 NOTE Verification of conductor function was previously called polarity in IEC 60364-6:2016.
246 Where relevant, the conductor function of the supply at the origin of the electrical installation
247 shall be verified before the electrical installation is energized.
248 Where single-pole switching or protective devices are not permitted in the neutral conductor, it
249 shall be verified that all such devices are connected in the line conductor only.
250 It should be verified that:
251 a) except for E14 and E27 lampholders according to IEC 60238, in circuits having an earthed
252 neutral conductor, centre contact bayonet and Edison screw lampholders, the outer or
253 screwed contacts are connected to the neutral conductor, and
254 b) wiring has been correctly connected throughout the electrical installation.
255 6.4.3.7 Verification of automatic disconnection of supply
256 6.4.3.7.1 General
257 The effectiveness of the measures for fault protection by automatic disconnection of supply
258 shall be verified for every intended combination of sources of supply.
259 Where there are multiple sources of supply, the settings of the protective devices for each
260 combination of the different supplies shall be verified. This information shall be provided with
261 the report indicating the additional source supply characteristics, earthing arrangements and
262 test results.
263 The verification of the effectiveness of the measures for fault protection by automatic
264 disconnection of supply is effected as follows:
265 a) For a TN system
266 Compliance with the rules of IEC 60364-4-41:2005+A1:2017, 411.3.2 and 411.4.4 shall be
267 verified by:
268 1) Measurement of the earth fault loop impedance where possible (see 6.4.3.7.3) .
269 Alternatively, where the measurement of earth fault loop impedance is not possible , the
270 verification of the electrical continuity of the protective conductors (see 6.4.3.2) and the
271 system referencing conductor is sufficient, provided that calculations of earth fault loop
272 impedance are available; and
273 2) Verification of the characteristics or the effectiveness of the associated protective
274 device, or both. This verification shall be made:
275 – for overcurrent protective devices, by visual inspection or other appropriate methods
276 (i.e. short time or instantaneous tripping setting for circuit-breakers, current rating
277 and type for fuses);
278 – for RCDs, by visual inspection.
IEC CDV 60364-6 © IEC 2025
279 The effectiveness of automatic disconnection by RCDs may be verified using suitable
280 test equipment according to IEC 61557-6.
281 Where the effectiveness of the protective measure has been confirmed at a point
282 located downstream of an RCD, the protection of the electrical installation
283 downstream from this point may be proved by verification of the continuity of the
284 protective conductors. This method should be used where it is not possible to measure
285 or calculate earth fault loop impedance.
286 b) For a TT system
287 Compliance with the rules of IEC 60364-4-41:2005+A1:2017, 411.3.2 and 411.5.3 shall be
288 verified by:
289 1) Measurement of the resistance R of the earth electrode or the impedance Zs of the
A
290 fault loop for exposed-conductive-parts of the electrical installation (see 6.4.3.7.2);
291 and
292 NOTE Annex C provides some examples of applicable methods for measurement of earth electrode resistance.
293 2) Verification of the characteristics or the effectiveness of the associated protective
294 device, or both. This verification shall be made:
295 – for overcurrent protective devices, by visual inspection or other appropriate methods
296 (i.e. short time or instantaneous tripping setting for circuit-breakers, current rating
297 and type for fuses);
298 – for RCDs, by visual inspection.
299 The effectiveness of automatic disconnection by RCDs may be verified using suitable
300 test equipment according to IEC 61557-6.
301 Where the effectiveness of the protective measure has been confirmed at a point
302 located downstream of an RCD, the protection of the electrical installation
303 downstream from this point may be proved by verification of the continuity of the
304 protective conductors. This method should be used where it is not possible to
305 measure or calculate earth fault loop impedance.
306 c) For an IT system
307 Compliance with the rules of IEC 60364-4-41:2005+A1:2017, 411.6.2 shall be verified by
308 calculation or measurement of the current I in case of a first fault of a live conductor.
d
309 The measurement is made only if the calculation is not possible, because all the parameters
310 are not known. Precautions are to be taken while making the measurement in order to avoid
311 the danger due to a double earth fault.
312 Where disconnection at the first fault is specified, the earth fault loop impedance shall be
313 verified. The inserted high impedance between live conductors and earth shall be verified by
314 measurement, as it is part of the earth fault loop impedance.
315 In the case of a double earth fault, the fault loop impedance shall be verified by calculations or
316 by measurements. Where the condition is similar to that of a TT-system (see
317 IEC 60364­4­41:2005, 411.6.4 item b), verification shall be made as for a TT system (see
318 6.4.3.7.1, item b)). Where conditions are similar to that of a TN-system (see IEC 60364-4-
319 41:2005+A1:2017, 411.6.2), verification by measurement shall be made as follows.
320 – For IT electrical installations supplied from a local transformer, the earth-loop impedance is
321 measured by inserting a connection with negligible impedance between a live conductor and
322 earth at the origin of the electrical installation. The earth-loop impedance measurement is
323 made between a second live conductor and protective-earth at the end of the circuit.
324 Verification is achieved if the measured value is  50 % of the maximum allowed loop-
325 impedance.
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326 – For IT systems connected to a public grid, the earth fault loop impedance is determined by
327 verification of the continuity of the protective conductor and measuring the loop-impedance
328 between two live conductors at the end of the circuit. Verification is achieved if the measured
329 value is  50 % of the maximum permitted loop-impedance.
330 6.4.3.7.2 Measurement of the resistance of the earth electrode
331 Measurement of the resistance of an earth electrode, where prescribed (see IEC 60364-4-41:
332 2005, 411.5.3, for a TT system, IEC 60364-4-41:2005+A1:2017, 411.4.1, for a TN system, and
333 IEC 60364-4-41:2005+A1:2017, 411.6.2, for an IT system), shall be made by an appropriate
334 method.
335 NOTE 1 Annex C, Method C1 gives, as an example, a description of a method of measurement using two auxiliary
336 earth electrodes and the conditions to be fulfilled.
337 NOTE 2 Where the location of the electrical installation (e.g. in towns) is such that it is not possible in practice to
338 provide the two auxiliary earth electrodes, measurement of the earth fault loop impedance a ccording to 6.4.3.7.3, or
339 Annex C, Methods C2 and C3 will give an acceptable approximate value.
340 6.4.3.7.3 Measurement of the earth fault loop impedance
341 Continuity of protective conductors shall be verified according to 6.4.3.2 before measuring the
342 earth fault loop impedance.
343 The measured earth fault loop impedance shall comply with IEC 60364-4-41:2005+A1:2017,
344 411.4.4 for TN systems and with IEC 60364-4-41: 2005, 411.6.4 for IT systems.
345 NOTE 1 The validity of test readings taken with a loop impedance test instrument could be
346 adversely affected by power converting equipment, such as inverters. Where the requirements
347 of 6.4.3.7.2 are not satisfied or in case of doubt and where supplementary bonding according
348 to IEC 60364-4-41:2005, 415.2 is applied, the effectiveness of that bonding shall be checked
349 according to IEC 60364-4-41:2005, 415.2.2.
350 NOTE 2 Annex D.6.4.3.7.3 provides guidance on taking the increase of conductor temperature into account when
351 determining earth fault loop impedance.
352 6.4.3.8 Verification of additional protection
353 The verification of the effectiveness of the measures applied for additional protection shall be
354 fulfilled by visual inspection.
355 The effectiveness of automatic disconnection of supply by RCD may be verified using suitable
356 test equipment according to IEC 61557-6.
357 Where additional protection is provided by supplementary protective bonding, the effectiveness
358 of that bonding shall be checked according to IEC 60364-4-41:2005+A1:2017, 415.2.2.
359 6.4.3.9 Test of phase rotation
360 In the case of polyphase circuits, it shall be verified that the desired direction of phase rotation
361 for the application is confirmed.
362 6.4.3.10 Correct operation of equipment
363 It shall be confirmed that equipment is operating as intended and installed in accordance with
364 the relevant requirements of the IEC 60364 series.
365 EXAMPLES:
366 – switchgear and controlgear assemblies, drives, controls and interlocks,
367 – systems for emergency switching off and emergency stopping,
IEC CDV 60364-6 © IEC 2025
368 – insulation monitoring device (IMD),
369 – transfer switching equipment (TSE),
370 – system-referencing-conductor switching device (SRCSD).
371 6.4.3.11 Verification of voltage drop
372 Where required to verify compliance with IEC 60364-5-52:2009, Clause 525, the voltage drop
373 shall be evaluated by measurement or by calculation (see IEC 60364-5-52:2009, Annex G).
374 NOTE Annex D.6.4.3.11 provides guidance on measurement of voltage drop.
375 6.4.3.12 Verification of prosumer’s electrical installation (PEI)
376 The following items shall be verified for a PEI:
377 – Grid connected PEI: disconnection of all the local supplies when the connection to the grid is de-energised;
378 – Islandable PEI:
379 • effectiveness of the local earth electrode(s) (where required),
380 • operation of the system-referencing-conductor switching device (SRCSD),
381 • the protective device settings for each combination of the different supplies.
383 6.4.4 Reporting for initial verification
384 6.4.4.1 Upon completion of the verification of a new electrical installation or additions or
385 alterations to an existing electrical installation, an electrical installation verification report shall
386 be provided. Such documentation shall include details of the extent of the electrical installation
387 covered by the report, together with a record of the inspection and the results of testing.
388 Any defects or omissions revealed during verification of the electrical installation shall be
389 corrected before the person carrying out the verification declares that the electrical installation
390 complies with the IEC 60364 series.
391 6.4.4.2 The verification report for alterations or additions, may contain recommendations for
392 repairs and improvements of the existing electrical installation.
393 6.4.4.3 The Initial report shall include details of the extent of the work covered, and
394 schedules of:
395 – inspections; and
396 – circuit details and test results.
397 The records of circuit details and test results shall identify every circuit, including its related
398 protective device(s) and shall record the results of the appropriate tests and measurements.
399 6.4.4.4 The person or persons responsible for the design, construction and verification of
400 the electrical installation shall give the report, which takes account of their respective
401 responsibilities, to the person ordering the work, together with the records mentioned in 6.4.4.3.
402 The initial report of the electrical installation shall make a recommendation for a period between
403 initial verification and the first periodic verification.
404 NOTE Examples of recommended intervals are provided in Annex H.
405 6.4.4.5 The report shall be compiled by one or more skilled persons, competent in
406 verification. The person undertaking the verification and the organisation responsible for it, shall
407 be identified on the report.
IEC CDV 60364-6 © IEC 2025
409 NOTE Annexes E, F and G contain model forms of reports and schedules that can be used for the description of initial and
410 periodic verification of electrical installations which are particularly suitable for residential electrical installations.
411 6.5 Periodic verification
412 6.5.1 General
413 6.5.1.1 Where required, periodic verification of every electrical installation shall be carried
414 out in accordance with 6.5.1.2 to 6.5.1.5.
415 The records and recommendations of previous verifications
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