SIST IEC 60364-6:2006

SLOVENSKI SIST IEC 60364-6:2006

STANDARD
september 2006
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Low-voltage electrical installations - Part 6: Verification
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91.140.50
SIST IEC 60364-6:2006(en)
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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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For price, see current catalogue

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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

IEC 60364-6:2006.81

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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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60364-6  IEC:2006 – 7 –
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
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC 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
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
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;

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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.

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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.
)
1
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
—————————
)
1
 The main title has been revised. Certain Parts of the IEC 60364 series still carry the old title.

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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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60364-6  IEC:2006 – 15 –
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);

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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.

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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.

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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 measureme
...