IEC 60364-6

SLOVENSKI SIST IEC 60364-6:2006

STANDARD
september 2006
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Low-voltage electrical installations - Part 6: Verification
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NORME CEI
INTERNATIONALE
IEC
60364-6
INTERNATIONAL
Première édition
STANDARD
First edition
2006-02
Installations électriques à basse tension –
Partie 6:
Vérification
Low-voltage electrical installations –
Part 6:
Verification
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60364-6  IEC:2006 – 3 –
CONTENTS
FOREWORD.7
6.1 Scope.11
6.2 Normative references .11
6.3 Terms and definitions .13
61 Initial verification .13
61.1 General .13
61.2 Inspection .15
61.3 Testing .17
61.3.1 General.17
61.3.2 Continuity of conductors.17
61.3.3 Insulation resistance of the electrical installation.19
61.3.4 Protection by SELV, PELV or by electrical separation .19
61.3.5 Insulation resistance/impedance of floors and walls .21
61.3.6 Protection by automatic disconnection of the supply .21
61.3.7 Additional protection. .25
61.3.8 Polarity test.25
61.3.9 Check of phase sequence .27
61.3.10 Functional tests .27
61.3.11 Verification of voltage drop .27
61.4 Reporting for initial verification .27
62 Periodic verification .29
62.1 General .29
62.2 Frequency of periodic verification .31
62.3 Reporting for periodic verification .31

Annex A (informative)  Methods for measuring the insulation resistance/impedance of
floors and walls to earth or to the protective conductor .35
A.1 General .35
A.2 Test method for measuring the impedance of floors and walls with
a.c.voltage .35
A.3 Test electrode 1 .37
A.4 Test electrode 2 .39
Annex B (informative) Method B1, B2 and B3 .41
B.1 Method B1 – Measurement of earth electrode resistance.41
B.2 Method B2 – Measurement of the fault loop impedance.43
B.3 Method B3 – Measurement of earth loop resistance with current clamps .45
Annex C (informative) Guide on the application of the rules of clause 61: Initial
verification .47
Annex D (informative) Example of a diagram suitable for the evaluation of the voltage drop 53
Annex E (informative) Recommendation for electrical equipment, which is being re-
used in electrical installations .55
Annex F (informative)  Description of the installation for verification .57
Annex G (informative) Form for inspection of electrical installations (see examples in G.2).63
Annex I (informative) Correspondence between IEC 60364-6-61:2001 and

60364-6  IEC:2006 – 5 –
Bibliography.83

Figure A.1 – Test electrode 1.37
Figure A.2 – Test electrode 2.39
Figure B.1 – Measurement of earth electrode resistance.41
Figure B.2 – Measurement of fault loop impedance by voltage drop.43
Figure B.3 – Measurement of earth loop resistance with current clamps .45

Table 6A – Minimum values of insulation resistance .19
Table H.1 – Model form for cicuit details and test results schedule .77

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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 co-operation on all questions concerning standardization in the electrical and electronic fields. To
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with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
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
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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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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
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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.
International Standard IEC 60364-6 has been prepared by IEC technical committee 64:
Electrical installations and protection against electrical shock.
This first edition of IEC 60364-6 replaces the second edition if IEC 60364-6-61, published in
2001, and constitutes a technical revision.
The main changes with respect to IEC 60364-6-61 are listed below:
– extension of the scope to cover, in addition to initial verification, also periodic verification
of electrical installations;
– modification of verification requirements in the case of protection by automatic
disconnection of the supply;
– requirements for verification of conditions for additional protection;
– requirements for reporting upon completion of initial and periodic verification;

60364-6  IEC:2006 – 9 –
– information concerning the measurement of earth loop impedance with current clamps;
– information concerning the evaluation of voltage drop;
– recommendations for electrical equipment which is being re-used;
– model forms of schedules that might be used for the description and for initial and periodic
verification of electrical installations.
The text of this standard is based on the following documents:
FDIS Report on voting
64/1497/FDIS 64/1517/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.
IEC 60364 consists of the following parts, under the general title: Low-voltage electrical
installations:
Part 1: Fundamental principles, assessment of general characteristics, definitions
Part 4: Protection for safety
Part 5: Selection and erection of electrical equipment
Part 6: Verification
Part 7: Requirements for special installations or locations
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
60364-6  IEC:2006 – 11 –
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 61 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 completion of a new
installation or completion of additions or of alterations to existing installations.
Clause 62 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 referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
)
IEC 60364 (all parts), Low-voltage electrical installations
IEC 60364-4-41, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
IEC 60364-4-42, Electrical installations of buildings – Part 4-42: Protection for safety –
Protection against thermal effects
IEC 60364-4-43, Electrical installations of buildings – Part 4-43: Protection for safety –
Protection against overcurrent
IEC 60364-5-51, Electrical installation of buildings – Part 5-51: Selection and erection of
electrical equipment – Common rules
IEC 60364-5-52, Electrical installations of buildings – Part 5-52: Selection and erection of
electrical equipment – Wiring systems
IEC 60364-5-53, Electrical installations of buildings – Part 5-53: Selection and erection of
electrical equipment – Isolation, switching and control
IEC 60364-5-54, Electrical installations of buildings – Part 5-54: Selection and erection of
electrical equipment – Earthing arrangements, protective conductors and protective bonding
conductors
—————————
)
The main title has been revised. Certain Parts of the IEC 60364 series still carry the old title.

60364-6  IEC:2006 – 13 –
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 61557-2, 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
IEC 61577-6, 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:
Residual current devices (RCD) in TT and TN systems
6.3 Terms and definitions
For the purposes of this document, the following 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 It comprises inspection, testing and reporting.
6.3.2
inspection
examination of an electrical installation using all the senses in order to ascertain correct
selection and proper erection of electrical equipment
6.3.3
testing
implementation of measures in an electrical installation by means of which its effectiveness is
proved
NOTE It 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 supervision actions,
intended to retain an item in, or restore it to, a state in which it can perform a required
function
61 Initial verification
NOTE In Annex C guidance on the application of the rules of Clause 61 is given.
61.1 General
61.1.1 Every installation shall be verified during erection, as far as reasonably practicable,
and on completion, before being put into service by the user.
61.1.2 The information required by 514.5 of Part 5-51 and other information necessary for
initial verification shall be made available to the person carrying out the initial verification.

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61.1.3 Initial verification shall include comparison of the results with relevant criteria to
confirm that the requirements of IEC 60364 have been met.
61.1.4 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.
61.1.5 For an addition or alteration to an existing installation, it shall be verified that the
addition or alteration complies with IEC 60364 and does not impair the safety of the existing
installation.
NOTE For re-used equipment see Annex E.
61.1.6 The initial verification shall be made by a skilled person, competent in verification.
NOTE Requirements concerning qualifications for enterprises and persons are a matter for national
consideration.
61.2 Inspection
61.2.1 Inspection shall precede testing and shall normally be done prior to energizing the
installation.
61.2.2 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 may be ascertained by examination of the manufacturer’s information, marking or certification.
– correctly selected and erected according to IEC 60364 and to the manufacturer’s
instructions;
– not visibly damaged so as to impair safety.
61.2.3 Inspection shall include at least the checking of the following, where relevant:
a) method of protection against electric shock (see Part 4-41);
b) presence of fire barriers and other precautions against propagation of fire and protection
against thermal effects (see Part 4-42 and Clause 527 of Part 5-52);
c) selection of conductors for current-carrying capacity and voltage drop (see Part 4-43 and
Clauses 523 and 525 of Part 5-52);
d) choice and setting of protective and monitoring devices (see Part 5-53);
e) presence and correct location of suitable isolating and switching devices (see Clause 536
of Part 5-53);
f) selection of equipment and protective measures appropriate to external influences (see
Clause 422 of Part 4-42, 512.2 of Part 5-51 and Clause 522 of Part 5-52);
g) neutral and protective conductors correctly identified (see 514.3 of Part 5-51);
h) single-pole switching devices connected in the line conductors (see Clause 536 of Part
5-53);
i) presence of diagrams, warning notices or other similar information (see 514.5 of Part 5-
51);
j) identification of circuits, overcurrent protective devices, switches, terminals, etc. (see
Clause 514 of Part 5-51);
60364-6  IEC:2006 – 17 –
k) adequacy of connection of conductors (see Clause 526 of Part 5-52);
l) presence and adequacy of protective conductors, including main and supplementary
equipotential bonding conductors (see Part 5-54);
m) accessibility of equipment for convenience of operation, identification and maintenance
(see Clauses 513 and 514 of Part 5-51).
Inspection shall include all particular requirements for special installations or locations.
61.3 Testing
61.3.1 General
The test methods described in this clause 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 IEC 61557. If other measuring equipment is used, it shall provide no
less 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 61.3.2);
b) insulation resistance of the electrical installation (see 61.3.3);
c) protection by SELV, PELV or by electrical separation (see 61.3.4);
d) floor and wall resistance/impedance (see 61.3.5);
e) automatic disconnection of supply (see 61.3.6);
f) additional protection (see 61.3.7);
g) polarity test (see 61.3.8);
h) test of the order of the phases (see 61.3.9);
i) functional and operational tests (see 61.3.10);
j) voltage drop (see 61.3.11) .
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.
NOTE 1 When testing is in a potentially explosive atmosphere appropriate safety precautions in accordance with
IEC 60079-17 and IEC 61241-17 are necessary.
NOTE 2 In Ireland, the following additional test is made to verify erroneous connections between circuits: for each
circuit, its protective device is disconnected and a test voltage in accordance with Table 6A applied between the
line conductors of that circuit and the line conductors of the other circuits.
61.3.2 Continuity of conductors
An electrical continuity test shall be made on
a) protective conductors, including main and supplementary equipotential bonding
conductors, and
b) in the case of ring final circuits, live conductors.
NOTE A ring final circuit is a final circuit arranged in a form of a ring connected to a single point of supply.

60364-6  IEC:2006 – 19 –
61.3.3 Insulation resistance of the electrical installation
The insulation resistance shall be measured between live conductors and the protective
conductor connected to the earthing arrangement. For the purposes of this test, live
conductors may be connected together.
Table 6A – Minimum values of insulation resistance
Nominal circuit voltage Test voltage d.c. Insulation resistance
V V
MΩ
SELV and PELV 250 ≥ 0,5
Up to and including 500 V, including FELV 500
≥ 1,0
Above 500 V 1 000
≥ 1,0
The insulation resistance, measured with the test voltage indicated in Table 6A, is satisfactory
if each circuit, with the appliances disconnected, has an insulation resistance not less than
the appropriate value given in Table 6A.
Table 6A shall be applied for a verification of the insulation resistance between non-earthed
protective conductors and earth.
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 the particular circuit may be reduced
to 250 V d.c., but the insulation resistance must have a value of at least 1 MΩ.
NOTE 1 For measurement purposes, the neutral conductor is disconnected from the protective conductor.
NOTE 2 In TN-C systems, measurement is made between the live conductors and the PEN conductor.
NOTE 3 In locations exposed to fire hazard, a measurement of the insulation resistance between the live
conductors should be applied. In practice, it may be necessary to carry out this measurement during erection of the
installation before the connection of the equipment.
NOTE 4 Insulation resistance values are usually much higher than those of Table 6A. When such values show
evident differences, further investigation is needed to identify the reasons.
NOTE 5 In China and Spain the minimum insulation resistance for circuits up to and including 500 V is 0,5 MΩ
NOTE 6 In Spain, the insulation values given in Table 6A are designed for an installation in which the length of
the wiring systems, irrespective of the number of conductors it contains, does not exceed 100 m. When this length
exceeds the value cited above and the installation can be broken down into segments of approximately 100 m in
length, either by sectioning, disconnecting and withdrawing fuses or opening switches, each of the parts in which
the installation has been broken down must present the relevant insulation resistance. When it is not possible to
break the installation down as indicated above, the insulation resistance value of the entire installation may, with
respect to corresponding minimum, be inversely proportional to the overall length, in hectometres, of the wiring
systems.
61.3.4 Protection by SELV, PELV or by electrical separation
The separation of circuits shall be in accordance with 61.3.4.1 in the case of protection by
SELV, 61.3.4.2 in the case of protection by PELV and 61.3.4.3 in the case of protection by
electrical separation.
The resistance value obtained in 61.3.4.1, 61.3.4.2 and 61.3.4.3 shall be at least that of the
circuit with the highest voltage present in accordance with Table 6A.

60364-6  IEC:2006 – 21 –
61.3.4.1 Protection by SELV
The separation of the live parts from those of other circuits and from earth, according to
Clause 414 of Part 4-41, shall be confirmed by a measurement of the insulation resistance.
The resistance values obtained shall be in accordance with Table 6A.
61.3.4.2 Protection by PELV
The separation of the live parts from other circuits, according to Clause 414 of Part 4-41, shall
be confirmed by a measurement of the insulation resistance. The resistance values obtained
shall be in accordance with Table 6A.
61.3.4.3 Protection by electrical separation
The separation of the live parts from those of other circuits and from earth, according to 413
of Part 4-41, shall be confirmed by a measurement of the insulation resistance. The
resistance values obtained shall be in accordance with Table 6A.
In case of electrical separation with more than one item of current-using equipment, either by
measurement or by calculation, it shall be verified that in 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.
61.3.5 Insulation resistance/impedance of floors and walls
When it is necessary to comply with the requirements of Clause C.1 of Part 4-41, 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 In Annex A, methods for measuring the insulating resistance/impedance of floors and walls are given as
examples.
61.3.6 Protection by automatic disconnection of the supply
NOTE Where RCDs are applied also for protection against fire, the verification of the conditions for protection by
automatic disconnection of the supply may be considered as covering the aspects of Part 4-42.
61.3.6.1 General
The verification of the effectiveness of the measures for protection against indirect contact by
automatic disconnection of supply is effected as follows:
a) For TN systems
Compliance with the rules of 411.4.4 and 411.3.2 of Part 4-41 shall be verified by:
1) measurement of the fault loop impedance (see 61.3.6.3).
NOTE 1 When RCDs with I ≤ 500 mA are used as disconnecting devices, measurement of the fault
Δn
loop impedance is normally not necessary
Alternatively, where the calculation of the fault loop impedance or of the resistance of
the protective conductors are available, and where the arrangement of the installation
permits the verification of the length and cross-sectional area of the conductors, the
verification of the electrical continuity of the protective conductors (see 61.3.2) is
sufficient.
NOTE 2 Compliance may be verified by measurement of the resistance of protective conductors.

60364-6  IEC:2006 – 23 –
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 (i.e.short time or
instantaneous tripping setting for circuit-breakers, current rating and type for
fuses);
– for RCDs, by visual inspection and test.
The effectiveness of automatic disconnection of supply by RCDs shall be verified using
suitable test equipment according to IEC 61557-6 (see 61.3.1) confirming that the
relevant requirements in Part 4-41 are met.
It is recommended that the disconnecting times required by Part 4-41 be verified.
However, the requirements for disconnecting times shall be verified in case of:
– re-used RCDs;
– additions or alterations to an existing installation where existing RCDs are also to
be used as disconnecting devices for such additions or alterations.
NOTE 1 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.
NOTE 2 In Sweden the verification is carried out by inspection.
In addition, it shall be confirmed by mutual agreement between the contractor and the
electricity supplier that the requirement of 411.4.1 of Part 4-41 is complied with.
b) For TT systems
Compliance with the rules of 411.5.3 of Part 4-41 shall be verified by:
1) measurement of the resistance R of the earth electrode for exposed- conductive-parts
A
of the installation (see 61.3.6.2);
NOTE Where the measurement of R is not possible, it may be possible to replace it by the measure of
A
the fault loop impedance as in a) 1).
2) verification of the characteristics and/or effectiveness of the associated protective
device. This verification shall be made:
– for overcurrent protective devices, by visual inspection (i.e. short time or
instantaneous tripping setting for circuit-breakers, current rating and type for
fuses);
– for RCDs, by visual inspection and by test.
The effectiveness of automatic disconnection of supply by RCDs shall be verified using
suitable test equipment according to IEC 61557-6 (see 61.3.1) confirming that the
relevant requirements in Part 4-41 are met.
It is recommended that the disconnecting times required by Part 4-41 be verified.
However, the requirements for disconnecting times shall be verified in case of:
– re-used RCDs;
– additions or alterations to an existing installation where existing RCDs are also to
be used as disconnecting devices for such additions or alterations.
NOTE 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 IT systems
Compliance with the rules of 411.6.2 of Part 4-41 shall be verified by calculation or
measurement of the current I in case of a first fault at the line conductor or at the neutral.
d
NOTE 1 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.
Where conditions that are similar to conditions of TT systems occur, in the event of a
second fault in another circuit (see point a) of 411.6.4 of Part 4-41), verification is made as
for TT systems (see point b) of this clause).

60364-6  IEC:2006 – 25 –
Where conditions that are similar to conditions of TN systems occur, in the event of a
second fault in another circuit (see point b) of 411.6.4 of Part 4-41), verification is made as
for TN systems (see point a) of this clause).
NOTE 2 During the measurement of the fault loop impedance, it is necessary to establish a connection of
negligible impedance between the neutral point of the system and the protective conductor preferably at the
origin of the installation or, where this is not acceptable, at the point of measurement.
NOTE 3 In Norway, the capacitive leakage current may vary, depending on the connected equipment and the
layout of the distribution network. If the capacitive leakage current is not possible to determine, either by
accurate calculations or by measurement, the leakage current, in mA, can be assumed to be 2 x the rated
power (S ) of the distribution transformer given in kVA.
N
61.3.6.2 Measurement of the resistance of the earth electrode
Measurement of the resistance of an earth electrode, where prescribed (see 411.5.3, for TT
systems, 411.4.1, for TN systems, and 411.6.2, for IT systems, of Part 4-41), is made by an
appropriate method.
NOTE 1 Annex B, Method B1, 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 fault loop impedance according to 61.3.6.3, or Annex B,
Methods B2 and B3, will give an excess value.
61.3.6.3 Measurement of the fault loop impedance
An electrical continuity test shall be made according to 61.3.2 before carrying out the fault
loop impedance measurement.
The measured fault loop impedance shall comply with 411.4.4 of Part 4-41 for TN systems
and with 411.6.4 of Part 4-41 for IT systems.
Where the requirements of this subclause are not satisfied or in case of doubt and where
supplementary equipotential bonding according to 415.2 of Part 4-41 is applied, the
effectiveness of that bonding shall be checked according to 415.2.2 of the same Part 4-41.
61.3.7 Additional protection
The verification of the effectiveness of the measures applied for additional protection is
fulfilled by visual inspection and test.
Where RCDs are required for additional protection, the effectiveness of automatic
disconnection of supply by RCDs shall be verified using suitable test equipment according to
IEC 61557-6 (see 61.3.1) confirming that the relevant requirements in Part 4-41 are met.
NOTE 1 Where an RCD is provided for fault protection and for additional protection, it should be tested according
to the relevant most onerous requirements of Part 4-41.
NOTE 2 In Sweden, verification is carried out by inspection.
61.3.8 Polarity test
Where the rules forbid the installation of single-pole switching devices in the neutral
conductor, a test shall be made to verify that all such devices are connected in the line
conductor(s) only.
NOTE 1 In Ireland and the United Kingdom, 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

60364-6  IEC:2006 – 27 –
b) except for E14 and E27 lampholders to EN 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.
NOTE 2 In Sweden the polarity test may be done by means of inspection only.
61.3.9 Check of phase sequence
In case of multiphase circuits, it shall be verified that the phase sequence is maintained.
61.3.10 Functional tests
Assemblies, such as switchgear and controlgear assemblies, drives, controls and interlocks,
shall be subjected to a test of their function to verify that they are properly mounted, adjusted
and installed in accordance with the relevant requirements of this standard.
Protective devices shall be submitted to a test of their function, as necessary, to check that
they are properly installed and adjusted.
NOTE This functional test does not replace the functional test indicated by the relevant standards.
61.3.11 Verification of voltage drop
Where required to verify compliance with Clause 525 of Part 5-52, the following options may
be used:
– the voltage drop may be evaluated by measuring the circuit impedance;
– the voltage drop may be evaluated by using diagrams similar to the one shown as an
example in Annex D.
61.4 Reporting for initial verification
61.4.1 Upon completion of the verification of a new installation or additions or alterations to
an existing installation, an initial report shall be provided. Such documentation shall include
details of the extent of the installation covered by the report, together with a record of the
inspection and the results of testing.
Any defects or omissions revealed during verification of the work shall be made good before
the contractor declares that the installation complies with IEC 60364.
61.4.2 In the case of initial verification of alterations or additions of existing installations, the
report may contain recommendations for repairs and improvements, as may be appropriate.
61.4.3 The initial report shall include:
– records of inspections;
– records of circuits tested and test results.
The records of circuit details and test results shall identify every circuit, including its related
protective device(s), and shall record the results of the appropriate tests and measurements.
NOTE In Sweden, the required content of the records of inspections and test results is not normative.

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61.4.4 The person or persons responsible for the safety, construction and verification of the
installation, shall give the report, which takes account of their respective responsibilities, to
the person ordering the work, together with the records mentioned in 61.4.3.
NOTE 1 The initial report of the electrical installation should make a recommendation for a period between initial
verification and the first periodic verification.
NOTE 2 In some countries, the period between initial verification and the first periodic verification is given by
legal or other national regulations.
61.4.5 Reports shall be compiled and signed or otherwise authenticated by a person or
persons competent in verification.
NOTE 1 Annexes F, G and H give model forms of schedules that might be used for the description and for initial,
and also periodic, verification of installations, particularly suitable for domestic installations.
NOTE 2 In Germany, in Hungary and in the Netherlands, Annexes F, G and H are replaced by amended national
normative annexes with a required minimum content.
62 Periodic verification
62.1 General
62.1.1 Where required, periodic verification of every electrical installation shall be carried
out in accordance with 62.1.2 to 62.1.6.
Wherever possible, the records and recommendations of previous periodic verifications shall
be taken into account.
62.1.2 Periodic inspection comprising a detailed examination of the installation shall be
carried out without dismantling, or with partial dismantling, as required, supplemented by
appropriate tests from Clause 61, including verification, to show that the requirements for
disconnecting times as set out in Part 4-41 for RCDs are complied with, and by
measurements, to provide for
a) safety of persons and livestock against the effects of electric shock and burn, and
b) protection against damage to property by fire and heat arising from an installation defect,
and
c) confirmation that the installation is not damaged or deteriorated so as to impair safety, and
d) the identification of installation defects and departures from the requirements of this
standard that may give rise to danger.
Where no previous report is available, further investigation is necessary.
NOTE 1 Existing installations may have been designed and installed to conform to previous editions of
IEC 60364, applicable at the time of their design and erection. This does not necessarily mean that they are
unsafe.
NOTE 2 According to the fifth edition of IEC 60364-4-41, when verifying compliance with the maximum
disconnecting times, the test should be applied at a residual current equal to 5 I .
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62.1.3 Precautions shall be taken to ensure that the periodic verification shall not cause
danger to persons or livestock and shall not cause damage to property and equipment even if
the circuit is defective.
60364-6  IEC:2006 – 31 –
Measuring instruments and monitoring equipment and methods shall be chosen in accordance
with relevant parts of IEC 61557. If other measuring equipment is used, it shall provide no
less degree of performance and safety.
62.1.4 The extent and results of the periodic verification of an installation, or any part of an
installation, shall be recorded.
62.1.5 Any damage, deterioration, defects or dangerous condition shall be recorded.
Furthermore, significant limitations of the periodic verification in accordance with this standard
and their reasons shall be recorded.
62.1.6 The verification shall be made by a skilled person, competent in verification.
NOTE Requirements concerning qualifications for enterprises and persons are a matter for national consideration.
62.2 Frequency of periodic verification
62.2.1 The frequency of periodic verification of an installation shall be determined having
regard to the type of installation and equipment, its use and operation, the frequency and
quality of maintenance and the external influences to which it is subjected.
NOTE 1 The maximum interval between periodic verifications may be laid down by legal or other national
regulations.
NOTE 2 The periodic report should recommend to the person carrying out the periodic verification the interval to
the next periodic verification.
NOTE 3 The interval may be, for instance some years (e.g. 4 years), with the exception of the following cases
where a higher risk may exist and shorter periods may be required:
- working places or locations where risks of electric shock, fire or explosion exist due to degradation;
- working places or locations where both high and low voltage installations exist;
- communal facilities;
- construction sites;
- safety installations (e.g. emergency luminaires).
For dwellings, longer periods (e.g. 10 years) may be appropriate. When occupancy of a dwelling has changed, a
verification of the electrical installation is strongly recommended.
The results and recommendations of the previous reports, where available, shall be taken into
account.
NOTE 4 Where no previous report is available, further investigation is necessary.
62.2.2 In the cas
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