IEC 60364-6:2016

Low voltage electrical installations - Part 6: Verification

IEC 60364-6:2016 provides requirements for initial and periodic verification of an electrical installation. This second edition cancels and replaces the first edition published in 2006 and constitutes a technical revision.
The contents of the corrigendum of September 2017 have been included in this copy.

Installations électriques à basse tension - Partie 6: Vérification

L'IEC 60364-6:2016 spécifie des exigences pour la vérification initiale et périodique d une installation électrique. Cette deuxième édition annule et remplace la première édition parue en 2006. Cette édition constitue une révision technique.
Le contenu du corrigendum de septembre 2017a été pris en considération dans cet exemplaire.

General Information

• Status: Published
• Publication Date: 26-Apr-2016
• ICS: 29.020 - Electrical engineering in general
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: TC 64 - Electrical installations and protection against electric shock
• Drafting Committee: MT 12 - TC 64/MT 12
• Current Stage: PPUB - Publication issued
• Start Date: 27-Apr-2016
• Completion Date: 15-Jun-2016

Relations

• Corrected By: IEC 60364-6:2016/COR1:2017 - Corrigendum 1 - Low voltage electrical installations - Part 6: Verification
• Effective Date: 05-Sep-2023
• Revises: IEC 60364-6:2006 - Low-voltage electrical installations - Part 6: Verification
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60364-6 ®
Edition 2.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low voltage electrical installations –
Part 6: Verification
Installations électriques à basse tension –
Partie 6: Vérification
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IEC 60364-6 ®
Edition 2.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low voltage electrical installations –

Part 6: Verification
Installations électriques à basse tension –

Partie 6: Vérification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 91.140.50 ISBN 978-2-8322-3347-4

– 2 – IEC 60364-6:2016 © IEC 2016
CONTENTS
FOREWORD . 4
6.1 Scope . 6
6.2 Normative references . 6
6.3 Terms and definitions . 7
6.4 Initial verification . 7
6.4.1 General . 7
6.4.2 Inspection . 8
6.4.3 Testing . 9
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
B.1 General . 19
B.2 Test method for measuring the impedance of floors and walls with a.c.
voltage . 19
B.3 Test electrode 1 . 20
B.4 Test electrode 2 . 20
Annex C (informative) Measurement of earth electrode resistance – Methods C1, C2
and C3 . 22
C.1 Method C1 – Measurement of earth electrode resistance using an earth
electrode test instrument . 22
C.2 Method C2 – Measurement of earth electrode resistance using a fault loop
impedance test instrument . 23
C.3 Method C3 – Measurement of earth electrode resistance using current
clamps . 24
Annex D (informative) Guidance on the application of the rules of Clause 6.4 – Initial
verification . 26
Annex E (informative) Model forms for reporting . 29
Annex F (informative) Model forms for inspection of electrical installations . 36
F.1 Model schedule for items requiring inspection for initial verification of an
electrical installation. . 36
F.2 Model inspection schedule of items requiring inspection for an existing
electrical installation . 40
Annex G (informative) Model schedule of circuit details and test results . 45
Annex H (informative) List of notes concerning certain countries . 46
Bibliography . 48

Figure B.1 – Test electrode 1 . 20
Figure B.2 – Test electrode 2 . 21
Figure C.1 – Measurement of the earth electrode resistance . 23
Figure C.2 – Measurement of the earth electrode resistance using an earth fault loop
impedance test instrument . 24
Figure C.3 – Measurement of earth electrode resistance using current clamps . 25

Table 6.1 – Minimum values of insulation resistance . 10
Table A.1 – Specific conductor resistance R for copper wiring at 30 °C dependent on
the nominal cross-sectional area S for rough calculation of conductor resistances . 18
Table E.1 – Electrical installation verification report (new or altered installation) . 29
Table E.2 – Electrical installation condition report (existing installations) . 32
Table G.1 – Model schedule of circuit details and test results . 45

– 4 – IEC 60364-6:2016 © IEC 2016
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
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indispensable for the correct application of this publication.
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patent 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 second edition cancels and replaces the first edition published in 2006 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) Re-numbered to align with current IEC numbering;
c) Initial inspection requirements: 3 items added;
d) Testing sequence changed;
e) General requirements for periodic reporting – more details added;
f) New Annex A: Table A.1 – Specific resistance values for copper conductors;

g) Annex D: Example of a diagram suitable for evaluation of voltage drop. Content removed;
h) Annex E: Recommendation for electrical equipment which is being re-used in an electrical
installation. Content removed;
i) Annex F: Content replaced with new Annex E – Model forms for reporting;
j) Annex G: Changed to Annex F – Model forms for inspection of electrical installations;
k) Annex H: Changed to Annex G – Model schedule of circuit details and test results;
l) Annex H: Listing of notes concerning some countries;
m) Bibliography – Updated:
The text of this standard is based on the following documents:
FDIS Report on voting
64/2107/FDIS 64/2114/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 H 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.
The contents of the corrigendum of September 2017 have been included in this copy.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 6 – IEC 60364-6:2016 © IEC 2016
LOW VOLTAGE ELECTRICAL INSTALLATIONS –

Part 6: Verification
6.1 Scope
This part of IEC 60364 provides requirements for initial and periodic verification of an
electrical installation.
Clause 6.4 provides requirements for initial verification, by inspection and testing, of an
electrical installation to determine, as far as reasonably practicable, whether the requirements
of the other parts of IEC 60364 have been met and requirements for the reporting of the
results of the initial verification. The initial verification takes place upon the completion of a
new installation or completion of an addition or an alteration to an existing installation.
Clause 6.5 provides requirements for periodic verification of an electrical installation to
determine, as far as reasonably practicable, whether the installation and all its constituent
equipment are in a satisfactory condition for use and requirements for the reporting of the
results of the periodic verification.
6.2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60079-17, Explosive atmospheres – Part 17: Electrical installations inspection and
maintenance
IEC 60364 (all parts), Low-voltage electrical installations
IEC 60364-4-41:2005, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
IEC 60364-4-42:2010, Low-voltage electrical installations – Part 4-42: Protection for safety –
Protection against thermal effects
IEC 60364-4-42:2010/AMD1:2014
IEC 60364-4-44:2007, Low-voltage electrical installations – Part 4-44: Protection for safety –
Protection against voltage disturbances and electromagnetic disturbances
IEC 60364-4-44:2007/AMD1:2015
IEC 60364-5-51:2005, Electrical installations of buildings – Part 5-51:– Selection and erection
of electrical equipment – Common rules
IEC 60364-5-52:2009, Low-voltage electrical installations – Part 5-52: Selection and erection
of electrical equipment – Wiring systems
IEC 60364-5-53:2001, Electrical installations of buildings – Part 5-53: Selection and erection
of electrical equipment – Isolation, switching and control
IEC 60364-5-53:2001/AMD1:2002
IEC 60364-5-53:2001/AMD2:2015
IEC 60364-5-54, Low-voltage electrical installations – Part 5-54: Selection and erection of
electrical equipment – Earthing arrangements and protective conductors
IEC 61557 (all parts), 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
IEC 61557-6, 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 6:
Effectiveness of residual current devices (RCD) in TT, TN and IT systems
6.3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
6.3.1
verification
all measures by means of which compliance of the electrical installation with the relevant
requirements of IEC 60364 is checked
Note 1 to entry: Verification comprises inspection, testing and reporting.
6.3.2
inspection
examination of an electrical installation using all appropriate senses in order to ascertain
correct selection and proper erection of electrical equipment
6.3.3
testing
implementation of measures to assess an electrical installation by means through which its
effectiveness is proved
Note 1 to entry: Testing includes ascertaining values by means of appropriate measuring instruments, said values
not being detectable by inspection.
6.3.4
reporting
recording of the results of inspection and testing
6.3.5
maintenance
combination of all technical and administrative actions, including supervisory actions,
intended to retain an item in, or restore it to, a state in which it can perform a required
function
6.4 Initial verification
6.4.1 General
6.4.1.1 Every installation shall be verified during erection, as far as reasonably practicable,
and on completion, before being put into service.
6.4.1.2 The information required by IEC 60364-5-51:2005, 514.5 and other information
necessary for initial verification shall be made available to the person carrying out the initial
verification.
6.4.1.3 The initial verification shall include comparison of the results with relevant criteria
to confirm that the requirements of the IEC 60364 series have been met.

– 8 – IEC 60364-6:2016 © IEC 2016
6.4.1.4 Precautions shall be taken to ensure that the verification shall not cause danger to
persons or livestock and shall not cause damage to property and equipment even if the circuit
is defective.
6.4.1.5 It shall be verified that an extension, addition or alteration to an existing installation
complies with the IEC 60364 series and does not impair the safety of that installation, and
that the safety of the new installation is not impaired by the existing installation.
6.4.1.6 The verification shall be made by a skilled person, competent in verification.
NOTE Requirements concerning qualifications are a matter for national consideration.
6.4.2 Inspection
6.4.2.1 Inspection shall precede testing and shall normally be done prior to energizing the
installation.
6.4.2.2 The inspection shall be made to confirm that electrical equipment which is part of
the fixed installation is:
– in compliance with the safety requirements of the relevant equipment standards;
NOTE This can be ascertained by examination of the manufacturer’s information, marking or certification.
– correctly selected and erected according to the IEC 60364 series and taking into account
the manufacturer’s instructions;
– not visibly damaged or defective so as to impair safety.
6.4.2.3 Inspection shall include at least the checking of the following, where relevant:
a) method of protection against electric shock (see IEC 60364-4-41);
b) presence of fire barriers and other precautions against propagation of fire and protection
against thermal effects (see IEC 60364-4-42 and IEC 60364-5-52:2009, Clause 527);
c) selection of conductors for current-carrying capacity (see IEC 60364-4-43 and IEC 60364-
5-52:2009, Clauses 523);
d) choice, setting, selectivity and coordination of protective and monitoring devices (see
IEC 60364-5-53:2001, Clause 536);
e) selection, location and installation of suitable overvoltage protective devices (SPD) where
specified (see IEC 60364-5-53:2001 and IEC 60364-5-53:2001/AMD2:2015, Clause 534);
f) selection, location and installation of suitable isolating and switching devices (see
IEC 60364-5-53:2001, Clause 536);
g) selection of equipment and protective measures appropriate to external influences and
mechanical stresses (see IEC 60364-4-42:2010, Clause 422, IEC 60364-5-51:2005, 512.2
and IEC 60364-5-52:2009, Clause 522);
h) identification of neutral and protective conductors (see IEC 60364-5-51:2005, 514.3);
i) presence of diagrams, warning notices or similar information (see IEC 60364-5-51:2005,
514.5);
j) identification of circuits, overcurrent protective devices, switches, terminals etc. (see
IEC 60364-5-51:2005, Clause 514);
k) adequacy of termination and connection of cables and conductors (see
IEC 60364-5-52:2009, Clause 526);
l) selection and installation of earthing arrangements, protective conductors and their
connections (see IEC 60364-5-54);
m) accessibility of equipment for convenience of operation, identification and maintenance
(see IEC 60364-5-51:2005, Clauses 513 and 514);
n) measures against electromagnetic disturbances (see IEC 60364-4-44:2007, Clause 444);

o) exposed-conductive-parts are connected to the earthing arrangement (see
IEC 60364-4-41:2005, Clause 411);
p) selection and erection of the wiring systems (see IEC 60364-5-52:2009, Clauses 521 and
522).
Inspection shall include all particular requirements for special installations or locations.
6.4.3 Testing
6.4.3.1 General
The test methods described in 6.4.3 are given as reference methods; other methods are not
precluded, provided they give no less valid results.
Measuring instruments and monitoring equipment and methods shall be chosen in accordance
with the relevant parts of the IEC 61557 series. If other measuring equipment is used, it shall
provide no less a degree of performance and safety.
The following tests shall be carried out where relevant and should preferably be made in the
following sequence:
a) continuity of conductors (see 6.4.3.2);
b) insulation resistance (see 6.4.3.3);
c) insulation resistance testing to confirm the effectiveness of protection by SELV, PELV or
electrical separation (see 6.4.3.4);
d) insulation resistance testing to confirm the effectiveness of floor and wall
resistance/impedance (see 6.4.3.5);
e) polarity test (see 6.4.3.6);
f) testing to confirm effectiveness of automatic disconnection of supply (see 6.4.3.7);
g) testing to confirm the effectiveness of additional protection (see 6.4.3.8);
h) test of phase sequence (see 6.4.3.9);
i) functional tests (see 6.4.3.10);
j) voltage drop (see 6.4.3.11).
In the event of any test indicating failure to comply, that test and any preceding test, the
results of which may have been influenced by the fault indicated, shall be repeated after the
fault has been rectified.
When testing in a potentially explosive atmosphere appropriate safety precautions in
accordance with IEC 60079-17 are necessary.
6.4.3.2 Continuity of conductors
The continuity of conductors and connection to exposed-conductive-parts, if any, shall be
verified by a measurement of resistance on:
a) protective conductors, including protective bonding conductors,
b) exposed-conductive-parts, and
c) in the case of ring final circuits, live conductors.
NOTE See also Annex A.
6.4.3.3 Insulation resistance of the electrical installation
The insulation resistance shall be measured between:
a) live conductors, and
– 10 – IEC 60364-6:2016 © IEC 2016
b) live conductors and the protective conductor connected to the earthing arrangement.
Where appropriate during this measurement, live conductors may be connected together. In
practice, it may be necessary to carry out this measurement during erection of the installation
before the connection of the equipment.
Where the circuit includes equipment that is likely to influence the results or be damaged,
only a measurement between the live conductors connected together and earth shall be
made.
The insulation resistance measured with the test voltages indicated in Table 6.1 shall be
considered satisfactory if the main switchboard and each distribution circuit tested separately,
with all its final circuits connected but with current-using equipment disconnected, has an
insulation resistance not less than the appropriate value given in Table 6.1.
Table 6.1 – Minimum values of insulation resistance
Nominal circuit voltage Test voltage d.c. Minimum insulation resistance
V V MΩ
SELV and PELV 250 0.5
Up to and including 500 V, 500 1
including FELV
Above 500 V 1 000 1
Table 6.1 shall be applied for a verification of the insulation resistance between non-earthed
protective conductors and earth.
FELV circuits shall be tested at the same test voltage as that applied to the primary side of
the source.
Where surge protective devices (SPDs) or other equipment are likely to influence the
verification test, or be damaged, such equipment shall be disconnected before carrying out
the insulation resistance test.
Where it is not reasonably practicable to disconnect such equipment (e.g. in case of fixed
socket-outlets incorporating an SPD) the test voltage for a particular circuit may be reduced to
250 V d.c. but the insulation resistance shall have a value of at least 1 MΩ.
To facilitate measurement, the neutral conductor shall be disconnected from the main earthing
terminal (MET).
In TN-C systems, a measurement should be made between the live conductors and the PEN
conductor.
Insulation resistance values are usually much higher than those of Table 6.1. When measured
values show evident differences between circuits, further investigation to identify the reasons
is required.
6.4.3.4 Insulation resistance testing to confirm effectiveness of SELV, PELV or
electrical separation
The separation of circuits shall be in accordance with 6.4.3.4.1 in the case of protection by
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
electrical separation.
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
circuit with the highest voltage present in accordance with Table 6.1.
6.4.3.4.1 Protection by SELV
The separation of live parts from those of other circuits and from earth, according to
IEC 60364-4-41:2005, Clause 414, shall be confirmed by a measurement of the insulation
resistance.
6.4.3.4.2 Protection by PELV
The separation of the live parts from other circuits, according to IEC 60364-4-41:2005
Clause 414, shall be confirmed by a measurement of the insulation resistance.
6.4.3.4.3 Protection by electrical separation
The separation of the live parts from those of other circuits and from earth, according to
IEC 60364-4-41:2005, Clause 413, shall be confirmed by a measurement of the insulation
resistance.
For electrical separation with more than one item of current-using equipment, it shall be
verified either by measurement or by calculation that in the case of two coincidental faults
with negligible impedance between different line conductors and either the protective bonding
conductor or exposed-conductive-parts connected to it, at least one of the faulty circuits shall
be disconnected. The disconnection time shall be in accordance with that for the protective
measure automatic disconnection of supply in a TN system.
6.4.3.5 Insulation resistance/impedance of floors and walls
When it is necessary to comply with the requirements of IEC 60364-4-41:2005, Clause C.1, at
least three measurements shall be made in the same location, one of these measurements
being approximately 1 m from any accessible extraneous-conductive-part in the location. The
other two measurements shall be made at greater distances.
The measurement of resistance/impedance of insulating floors and walls is carried out with
the system voltage to earth at nominal frequency.
The above series of measurements shall be repeated for each relevant surface of the
location.
NOTE Further information on the measurement of the insulation resistance/impedance of floors and walls is given
in Annex B.
6.4.3.6 Polarity
Where relevant, the polarity of the supply at the origin of the installation shall be verified
before the installation is energized.
Where single pole switching devices are not permitted in the neutral conductor, a test shall be
made to verify that all such devices are connected in the line conductor(s) only.
During the polarity test, it should be verified that:
a) every fuse and single-pole control and protective device is connected in the line conductor
only, and
b) except for E14 and E27 lampholders according to IEC 60238, in circuits having an earthed
neutral conductor centre contact bayonet and Edison screw lampholders, the outer or
screwed contacts are connected to the neutral conductor, and
c) wiring has been correctly connected to socket-outlets and similar accessories.

– 12 – IEC 60364-6:2016 © IEC 2016
6.4.3.7 Protection by automatic disconnection of supply
NOTE Where RCDs are employed also for protection against fire, the verification of the conditions for protection
by automatic disconnection of the supply can be considered as covering the relevant requirements of IEC 60364-4-
42.
6.4.3.7.1 General
The verification of the effectiveness of the measures for fault protection by automatic
disconnection of supply is effected as follows:
a) For a TN system
Compliance with the rules of IEC 60364-4-41: 2005, 411.4.4 and 411.3.2 shall be verified by:
1) Measurement of the earth fault loop impedance where possible (see 6.4.3.7.3).
Alternatively, where the measurement of earth fault loop impedance is not possible the
verification of the electrical continuity of the protective conductors (see 6.4.3.2) is
sufficient provided that calculations of earth fault loop impedance or protective
conductor resistance are available.
2) Verification of the characteristics and/or the effectiveness of the associated protective
device. This verification shall be made:
– for overcurrent protective devices, by visual inspection or other appropriate
methods (i.e. short time or instantaneous tripping setting for circuit-breakers,
current rating and type for fuses);
– for RCDs, by visual inspection and testing.
The effectiveness of automatic disconnection by RCDs shall be verified using
suitable test equipment according to IEC 61557-6 confirming that the relevant
requirements in IEC 60364-4-41 are met taking into account the operating
characteristic of the device. The effectiveness of the protective measure is verified
if disconnection occurs with a fault current lower than or equal to the rated residual
operating current I .
∆n
It is recommended that the disconnection times required by IEC 60364-4-41 be
verified. However, the requirements for disconnecting times shall be verified in case
of additions and alterations to an existing installation where existing RCDs are also
used as disconnecting devices for such additions and alterations.
Where the effectiveness of the protective measure has been confirmed at a point located
downstream of an RCD, the protection of the installation downstream from this point may be
proved by confirmation of the continuity of the protective conductors.
b) For a TT system
Compliance with the rules of IEC 60364-4-41: 2005, 411.5.3 and 411.3.2 shall be verified by:
of the earth electrode for exposed-conductive-parts
1) Measurement of the resistance R
A
of the installation (see 6.4.3.7.2).
Where a measurement of R is not practicable the measured value of external earth
A
fault loop impedance may be used (see Annex C, Methods C2 and C3).
2) Verification of the characteristics and/or the effectiveness of the associated protective
device. This verification shall be made:
– for overcurrent protective devices, by visual inspection or other appropriate
methods (i.e. short time or instantaneous tripping setting for circuit-breakers,
current rating and type for fuses);
– for RCDs, by visual inspection and testing.
The effectiveness of automatic disconnection by RCDs shall be verified using
suitable test equipment according to IEC 61557-6 confirming that the relevant
requirements in IEC 60364-4-41 are met taking into account the operating
characteristic of the device. The effectiveness of the protective measure is verified

if disconnection occurs with a fault current lower or equal to the rated residual
operating current I .
∆n
It is recommended that the disconnection times required by IEC 60364-4-41 be
verified. However, the requirements for disconnecting times shall be verified in
case of additions and alterations to an existing installation where existing RCDs are
also used as disconnecting devices for such additions and alterations.
Where the effectiveness of the protective measure has been confirmed at a point located
downstream of an RCD, the protection of the installation downstream from this point may be
proved by confirmation of the continuity of the protective conductors.
c) For an IT system
Compliance with the rules of IEC 60364-4-41: 2005, 411.6.2 shall be verified by calculation or
measurement of the current I in case of a first fault of a live conductor.
d
The measurement is made only if the calculation is not possible, because all the parameters
are not known. Precautions are to be taken while making the measurement in order to avoid
the danger due to a double fault.
In the case of a double earth fault, the fault loop impedance shall be verified by calculations
or by measurements. Where the condition is similar to that of a TT-system (see
IEC 60364-4-41:2005, 411.6.4 item b), verification shall be made as for a TT system (see
6.4.3.7.1, item b)). Where conditions are similar to that of a TN-system (see IEC 60364-4-
41:2005, 411.6.2), verification by measurement shall be made as follows.
– For IT installations supplied from a local transformer, the earth-loop impedance is
measured by inserting a connection with negligible impedance between a live conductor
and earth at the origin of the installation. The earth-loop impedance measurement is made
between a second live conductor and protective-earth at the end of the circuit. Verification
is achieved if the measured value is ≤ 50 % of the maximum allowed loop-impedance.
– For IT systems connected to a public grid, the earth fault loop impedance is determined by
verification of the continuity of the protective conductor and measuring the loop-
impedance between two live conductors at the end of the circuit. Verification is achieved if
the measured value is ≤ 50 % of the maximum permitted loop-impedance. If verification is
not achieved, more detailed measurements are necessary.
6.4.3.7.2 Measurement of the resistance of the earth electrode
Measurement of the resistance of an earth electrode, where prescribed (see IEC 60364-4-41:
2005, 411.5.3, for a TT system, 411.4.1, for a TN system, and 411.6.2, for an IT system),
shall be made by an appropriate method. When measuring the resistance is not possible, the
resistance may also be calculated using applicable values.
NOTE 1 Annex C, Method C1 gives, as an example, a description of a method of measurement using two auxiliary
earth electrodes and the conditions to be fulfilled.
NOTE 2 Where the location of the installation (e.g. in towns) is such that it is not possible in practice to provide
the two auxiliary earth electrodes, measurement of the earth fault loop impedance according to 6.4.3.7.3, or
Annex C, Methods C2 and C3 will give an acceptable approximate value.
6.4.3.7.3 Measurement of the earth fault loop impedance
An electrical continuity test shall be carried out according to 6.4.3.2 before carrying out the
earth fault loop impedance measurement.
The measured earth fault loop impedance shall comply with IEC 60364-4-41: 2005, 411.4.4
for TN systems and with IEC 60364-4-41: 2005, 411.6.4 for IT systems.

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Where the requirements of 6.4.3.7.2 are not satisfied or in case of doubt and where
supplementary bonding according to IEC 60364-4-41:2005, 415.2 is applied, the effectiveness
of that bonding shall be checked according to IEC 60364-4-41:2005, 415.2.2.
6.4.3.8. Additional protection
The verification of the effectiveness of the measures applied for additional protection is
fulfilled by visual inspection and test.
Where an RCD is required for additional protection, the effectiveness of automatic
disconnection of supply by RCD shall be verified using suitable test equipment according to
IEC 61557-6.
Where additional protection is provided by supplementary protective bonding, the
effectiveness of that bonding shall be checked according to IEC 60364-4-41:2005, 415.2.2.
6.4.3.9 Phase sequence
In the case of multiphase circuits, it shall be verified that the phase sequence is maintained.
6.4.3.10 Functional testing
Equipment shall be subjected to functional testing to verify that it is properly mounted,
adjusted and installed in accordance with the relevant requirements of the IEC 60364 series.
Examples of such equipment are:
– switchgear and controlgear assemblies, drives, controls and interlocks,
– systems for emergency switching off and emergency stopping,
– insulation monitoring.
NOTE 1 This list is not exhaustive.
Protective devices shall be submitted to a test of their function, as necessary, to check that
they are properly installed and adjusted. Where fault protection and/or additional protection is
to be provided by an RCD, the effectiveness of any test facility incorporated in the device
shall be verified.
NOTE 2 This functional test does not replace the functional test indicated by the relevant standards.
6.4.3.11 Verification of voltage drop
Where required to verify compliance with IEC 60364-5-52: 2009, Clause 525, the voltage drop
shall be evaluated by measurement or by calculation (see IEC 60364-5-52: 2009, Annex G).
Measurement may be:
– comparison of the difference between the voltage with and without the design load
connected, or
– comparison of the difference between the voltage with and without any known load
connected and recalculated to the design load, or
– circuit impedance values.
6.4.4 Reporting for initial verification
6.4.4.1 Upon completion of the verification of a new installation or additions or alterations
to an existing installation, an electrical installation verification report shall be provided. Such
documentation shall include details of
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