IEC 60364-1

Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, definitions

Gives the rules for the design, erection, and verification of electrical installations. The rules are intended to provide for the safety of persons, livestock and property against dangers and damage which may arise in the reasonable use of electrical installations and to provide for the proper functioning of those installations.[
]IEC 60364-1 applies to the design, erection and verification of electrical installations such as those of a) residential premises; b) commercial premises; c) public premises; d) industrial premises; e) agricultural and horticultural premises; f) prefabricated buildings; g) caravans, caravan sites and similar sites; h) construction sites, exhibitions, fairs and other installations for temporary purposes; i) marinas; j) external lighting and similar installations; k) medical locations; l) mobile or transportable units; m) photovoltaic systems; n) low-voltage generating sets.[
]IEC 60364-1 covers[
]a) circuits supplied at nominal voltages up to and including 1 000 V a.c. or 1 500 V d.c.;[
]b) circuits, other than the internal wiring of apparatus, operating at voltages exceeding 1 000 V and derived from an installation having a voltage not exceeding 1 000 V a.c., for example, discharge lighting, electrostatic precipitators;[
]c) wiring systems and cables not specifically covered by the standards for appliances;[
]d) all consumer installations external to buildings;[
]e) fixed wiring for information and communication technology, signalling, control and the like (excluding internal wiring of apparatus);[
]f) the extension or alteration of the installation and also parts of the existing installation affected by the extension or alteration.[
]The contents of the corrigendum of August 2009 have been included in this copy.

Installations électriques à basse tension - Partie 1: Principes fondamentaux, détermination des caractéristiques générales, définitions

Donne des règles pour la conception, la mise en  uvre et la vérification des installations électriques. Ces règles sont Destinées à assurer la sécurité des personnes, des animaux et des biens contre les dangers et les dommages susceptibles de se produire lors d'une utilisation raisonnable des installations électriques et à assurer le fonctionnement correct de ces installations.[
]La CEI 60364-1 s'applique à la conception, à la mise en  uvre et aux vérifications des installations électriques telles que celles des: a) bâtiments à usage d'habitation; b) bâtiments à usage commercial; c) établissements recevant du public; d) établissements industriels; e) établissements agricoles et horticoles; f) bâtiments préfabriqués; g) caravanes, terrains de campement et installations analogues; h) hantiers, fêtes foraines, foires, expositions et autres installations temporaires; i) marinas; j) éclairages extérieurs et analogues; k) locaux médicaux; l) unités  mobiles ou transportables; m) réseaux photovoltaïques; n) groupes générateurs à basse tension.[
]La CEI 60364-1 est applicable:[
]a) aux circuits alimentés sous une tension nominale au plus égale à 1 000 V en courant alternatif et à 1 500 V en courant continu;[
]b) aux circuits, autres que les circuits internes des appareils, fonctionnant sous une tension supérieure à 1 000 V à partir d'une installation de tension au plus égale à 1 000 V en courant alternatif, par exemple: circuits de lampes à décharge, dépoussiéreurs électrostatiques;[
]c) à tout câblage et à toute canalisation qui ne font pas l'objet des normes relatives aux appareils d'utilisation;[
]d) à toutes les installations d'utilisateur situées à l'extérieur des bâtiments;[
]e) aux canalisations fixes de communication, de signalisation ou de commande (à l'exception de circuits internes des appareils);[
]f) aux extensions ou modifications d'installations ainsi qu'aux parties des installations existantes affectées par ces extensions ou modifications.[
]Le contenu du corrigendum d'août 2009 a été pris en considération dans cet exemplaire.

Nizkonapetostne električne inštalacije – 1. del: Temeljna načela, ocenjevanje splošnih značilnosti, definicije

General Information

• Status: Not Published
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: TC 64 - Electrical installations and protection against electric shock
• Current Stage: PPUB - Publication issued
• Start Date: 29-Nov-2005
• Ref Project: SIST IEC 60364-1:2006 - Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, definitions

Standards Content (Sample)

SLOVENSKI SIST IEC 60364-1:2006

STANDARD
september 2006
Nizkonapetostne električne inštalacije – 1. del: Temeljna načela, ocenjevanje
splošnih značilnosti, definicije
Low-voltage electrical installations - Part 1: Fundamental principles, assessment of
general characteristics, definitions
ICS 91.140.50 Referenčna številka
SIST IEC 60364-1:2006(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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IEC 60364-1
Edition 5.0 2005-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage electrical installations –
Part 1: Fundamental principles, assessment of general characteristics,
definitions

Installations électriques à basse tension –
Partie 1: Principes fondamentaux, détermination des caractéristiques générales,
définitions

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 91.140.50 ISBN 2-8318-8354-7

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60364-1  IEC:2005 – 3 –
CONTENTS
FOREWORD.5

11 Scope.7
12 Normative references .9
13 Fundamental principles .10
131 Protection for safety.10
131.1 General.10
131.2 Protection against electric shock .10
131.3 Protection against thermal effects .11
131.4 Protection against overcurrent.11
131.5 Protection against fault currents .11
131.6 Protection against voltage disturbances and measures against
electromagnetic influences .11
131.7 Protection against power supply interruption .12
132 Design .12
132.1 General.12
132.2 Characteristics of available supply or supplies .12
132.3 Nature of demand.13
132.4 Electric supply systems for safety services or standby electric
supply systems.13
132.5 Environmental conditions .13
132.6 Cross-sectional area of conductors .13
132.7 Type of wiring and methods of installation.14
132.8 Protective equipment.14
132.9 Emergency control .14
132.10 Disconnecting devices.14
132.11 Prevention of mutual detrimental influence .14
132.12 Accessibility of electrical equipment .14
132.13 Documentation for the electrical installation .15
133 Selection of electrical equipment .29
133.1 General.29
133.2 Characteristics.29
133.3 Conditions of installation .15
133.4 Prevention of harmful effects.16
134 Erection and verification of electrical installations .16
134.1 Erection .16
134.2 Initial verification.17
134.3 Periodic verification.17
20 Terms and definitions .17
30 Assessment of general characteristics.17
31 Purposes, supplies and structure.17
311 Maximum demand and diversity .17
312 Conductor arrangement and system earthing .17
312.1 Current-carrying conductors depending on kind of current.18
312.2 Types of system earthing .19

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60364-1  IEC:2005 – 5 –
313 Supplies.36
313.1 General.36
313.2 Supplies for safety services and standby systems .36
314  Division of installation.36
32 Classification of external influences.37
33 Compatibility .37
33.1 Compatibility of characteristics .37
33.2 Electromagnetic compatibility .37
34 Maintainability .37
35 Safety services.38
35.1  General .38
35.2  Classification .38
36 Continuity of service.38

Annex A (informative) Numbering system and plan of IEC 60364 series.39
Annex B (informative) Definitions – Application guide and explanations to selected
terms of IEC 60050-826 (IEV 826 – Electrical Installations) .42
Annex C (informative) Comparison of the structure of IEC 60364-1 fourth edition 2001
and IEC 60364-1 fifth edition 2005.45

Bibliography.47

Figure 1 – Single-phase 2-wire .18
Figure 2 – Single-phase 3-wire .18
Figure 3 – Two-phase 3-wire.18
Figure 4 – Three-phase 3-wire .18
Figure 5 – Three-phase 4-wire .19
Figure 6 – 2-wire.19
Figure 7 – 3-wire.19
Figure 31A1 – TN-S system with separate neutral conductor and protective conductor
throughout the system .20
Figure 31A2 – TN-S system with separate earthed line conductor and protective
conductor throughout the system .21
Figure 31A3 – TN-S system with earthed protective conductor and no distributed
neutral conductor throughout the system .21
Figure 31B1 – TN-C-S system 3-phase, 4-wire, where the PEN is separated into PE
and N elsewhere in the installation .22
Figure 31B2 – TN-C-S system 3-phase, 4-wire where the PEN is separated into PE
and N at the origin of the installation.23
Figure 31B3 – TN-C-S system – Single-phase, 2-wire where the PEN is separated into
PE and N at the origin of the installation .23
Figure 31C – TN-C system with neutral and protective conductor functions combined in
a single conductor throughout the system .24
Figure 31D – TN-C-S multiple source system with separate protective conductor and
neutral conductor to current using equipment.25
Figure 31E – TN multiple source system with protective conductor and no neutral
conductor throughout the system for 2- or 3-phase load.26

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60364-1  IEC:2005 – 7 –
Figure 31F1 – TT system with separate neutral conductor and protective conductor
throughout the installation.27
Figure 31F2 – TT system with earthed protective conductor and no distributed neutral
conductor throughout the installation .28
Figure 31G1 – IT system with all exposed-conductive-parts interconnected by a
protective conductor which is collectively earthed .29
Figure 31G2 – IT system with exposed-conductive-parts earthed in groups or
individually.30
Figure 31H – TN-S d.c. system .31
Figure 31J – TN-C d.c. system.32
Figure 31K – TN-C-S d.c. system.33
Figure 31L – TT d.c. system .34
Figure 31M – IT d.c. system.35
Figure B.1 – Zone of arm’s reach.43

Table A.1 – Numbering system of IEC 60364 series.39
Table A.2 – Plan of IEC 60364 series: Electrical installations of buildings .40

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60364-1  IEC:2005 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

LOW-VOLTAGE ELECTRICAL INSTALLATIONS –

Part 1: Fundamental principles, assessment of
general characteristics, definitions


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 60364-1 has been prepared by IEC Technical Committee 64:
Electrical installations and protection against electric shock.
This fifth edition cancels and replaces the fourth edition, published in 2001. It constitutes a
technical revision.
The main changes with respect to the previous edition are:
– in order to complete the scope, the new items external lighting and similar installations,
medical locations, mobile or transportable units, photovoltaic power supply units and low-
voltage generating sets are added;
– in Clause 131, "Fundamental principles", the list of hazards which may arise in electrical
installations is completed; furthermore, a new subclause dealing with protection against
voltage disturbances and measures against electromagnetic influences and a new
subclause dealing with protection against power supply interruption are added;

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60364-1  IEC:2005 – 11 –
– in Clause 132, "Design", the new subclause "Documentation for the electrical installation"
is added;
– in Clause 134, "Erection and verification of electrical installations", the new subclause "
periodic verification" is added;
– the former Clause 312, "Types of distribution system" is renamed "Conductor arrangement
and system earthing" and, in the relevant subclauses, several new figures are included for
better understanding of the different kind of a.c. and d.c. circuits and types of systems and
their earthing being applied nowadays in IEC member countries;
– in 33.1, "Compatibility of characteristics", a new item for excessive PE conductor currents
is added;
– a new Clause 36, "Continuity of service", is included;
– Annex B is aligned with the second edition of IEC 60050-826:2004.
The text of this standard is based on the following documents:
FDIS Report on voting
64/1488/FDIS 64/1499/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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60364-1  IEC:2005 – 13 –
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –

Part 1: Fundamental principles, assessment of
general characteristics, definitions



1
11 Scope
IEC 60364-1 gives the rules for the design, erection, and verification of electrical installations.
The rules are intended to provide for the safety of persons, livestock and property against
dangers and damage which may arise in the reasonable use of electrical installations and to
provide for the proper functioning of those installations.
11.1 IEC 60364-1 applies to the design, erection and verification of electrical installations
such as those of
a) residential premises;
b) commercial premises;
c) public premises;
d) industrial premises;
e) agricultural and horticultural premises;
f) prefabricated buildings;
g) caravans, caravan sites and similar sites;
h) construction sites, exhibitions, fairs and other installations for temporary purposes;
i) marinas;
j) external lighting and similar installations (see, however ,11.3e));
k) medical locations;
l) mobile or transportable units;
m) photovoltaic systems;
n) low-voltage generating sets.
NOTE “Premises” covers the land and all facilities including buildings belonging to it.
11.2 IEC 60364-1 covers
a) circuits supplied at nominal voltages up to and including 1 000 V a.c. or 1 500 V d.c.;
For a.c., the preferred frequencies which are taken into account in this standard are
50 Hz, 60 Hz and 400 Hz. The use of other frequencies for special purposes is not
excluded.
b) circuits, other than the internal wiring of apparatus, operating at voltages exceeding 1 000 V
and derived from an installation having a voltage not exceeding 1 000 V a.c., for example,
discharge lighting, electrostatic precipitators;
—————————
1
 The numbering system is explained in Annex A.

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60364-1  IEC:2005 – 15 –
c) wiring systems and cables not specifically covered by the standards for appliances;
d) all consumer installations external to buildings;
e) fixed wiring for information and communication technology, signalling, control and the like
(excluding internal wiring of apparatus);
f) the extension or alteration of the installation and also parts of the existing installation
affected by the extension or alteration.
NOTE The rules of IEC 60364-1 are intended to apply to electrical installations generally but, in certain cases,
they may need to be supplemented by the requirements or recommendations of other IEC standards (for example,
for installations in explosive gas atmospheres).
11.3 IEC 60364-1 does not apply to
a) electric traction equipment, including rolling stock and signaling equipment;
b) electrical equipment of motor vehicles, except those covered in Part 7;
c) electrical installations on board ships and mobile and fixed offshore platforms;
d) electrical installations in aircraft;
e) public street-lighting installations which are part of the public power grid;
f) installations in mines and quarries;
g) radio interference suppression equipment, except where it affects the safety of the
installation;
h) electric fences;
i) external lightning protection systems for buildings (LPS);
NOTE Atmospheric phenomena are covered in IEC 60364-1 but only insofar as effects on the electrical
installations are concerned (for example, with respect to selection of surge protective devices).
j) certain aspects of lift installations;
k) electrical equipment of machines.
11.4 IEC 60364-1 is not intended to apply to
– systems for distribution of energy to the public, or
– power generation and transmission for such systems.
NOTE 1 Countries wishing to do so may, however, use this standard in whole or in part for that purpose.
NOTE 2 According to IEC 61936 which provides common rules for the design and the erection of electrical power
installations in systems with nominal voltages above 1kV a.c. and nominal frequency up to and including 60 Hz,
low- voltage a.c. and d.c. protection and monitoring systems should be in accordance with IEC 60364 series.
11.5 Electrical equipment is dealt with only so far as its selection and application in the
installation are concerned.
This applies also to assemblies of electrical equipment complying with the relevant standards.

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60364-1  IEC:2005 – 17 –
12 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 60038, IEC standard voltages
IEC 60050(691), International Electrotechnical Vocabulary (IEV) – Chapter 691: Tariffs for
electricity
IEC 60050-826, International Electrotechnical Vocabulary (IEV) – Part 826: Electrical
installations
IEC 60364-4-41, Electrical installations of buildings – 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 60364-4-44, Electrical installations of buildings – Part 4-44: Protection for safety –
Protection against voltage disturbances and electromagnetic disturbances
IEC 60364-5-51, Electrical installations 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 60364-5-53:2001, 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
IEC 60364-5-55:2001, Electrical installations of buildings – Part 5-55: Selection and erection
of electrical equipment – Other equipment
IEC 60445, Basic and safety principles for man-machine interface, marking and identification -
Identification of equipment terminals and of terminations of certain designated conductors,
including general rules for an alphanumeric system
IEC 60446, Basic and safety principles for man-machine interface, marking and identification
– Identification of conductors by colours or numerals
2
IEC 60617-DB:2001 , Graphical symbols for diagrams
IEC 60721 (all parts), Classification of environmental conditions
—————————
2
 ″DB″ refers to the IEC on-line database.

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60364-1  IEC:2005 – 19 –
13 Fundamental principles
NOTE 1 Where countries not yet having national regulations for electrical installations deem it necessary to
establish legal requirements for this purpose, it is recommended that such requirements be limited to fundamental
principles which are not subject to frequent modification on account of technical development. The contents of
Clause 13 may be used as a basis for such legislation.
NOTE 2 This clause contains basic requirements. In other parts of this standard (see Table A.2), more detailed
requirements may be given.
131 Protection for safety
131.1 General
The requirements stated in 131.2 to 131.7 are intended to provide for the safety of persons,
livestock and property against dangers and damage which may arise in the reasonable use of
electrical installations. The requirements to provide for the safety of livestock are applicable in
locations intended for them.
NOTE In electrical installations, the following hazards may arise:
– shock currents;
– excessive temperatures likely to cause burns, fires and other injurious effects;
– ignition of a potentially explosive atmosphere;
– undervoltages, overvoltages and electromagnetic influences likely to cause or result in injury or
damage;
– power supply interruptions and/or interruption of safety services;
– arcing, likely to cause blinding effects, excessive pressure, and/or toxic gases;
– mechanical movement of electrically activated equipment.
131.2 Protection against electric shock
131.2.1 Basic protection (protection against direct contact)
NOTE For low-voltage installations, systems and equipment, basic protection generally corresponds to protection
against direct contact.
Protection shall be provided against dangers that may arise from contact with live parts of the
installation by persons or livestock.
This protection can be achieved by one of the following methods:
– preventing a current from passing through the body of any person or any livestock;
– limiting the current which can pass through a body to a non-hazardous value.
131.2.2 Fault protection (protection against indirect contact)
NOTE For low-voltage installations, systems and equipment, fault protection generally corresponds to protection
against indirect contact, mainly with regard to failure of basic insulation.
Protection shall be provided against dangers that may arise from contact with exposed-
conductive-parts of the installation by persons or livestock.

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60364-1  IEC:2005 – 21 –
This protection can be achieved by one of the following methods:
– preventing a current resulting from a fault from passing through the body of any person or
any livestock;
– limiting the magnitude of a current resulting from a fault, which can pass through a body,
to a non-hazardous value;
– limiting the duration of a current resulting from a fault, which can pass through a body, to
a non-hazardous time period.
131.3 Protection against thermal effects
The electrical installation shall be so arranged to minimize the risk of damage or ignition of
flammable materials due to high temperature or electric arc. In addition, during normal
operation of the electrical equipment, there shall be no risk of persons or livestock suffering
burns.
131.4 Protection against overcurrent
Persons and livestock shall be protected against injury and property shall be protected
against damage due to excessive temperatures or electromechanical stresses caused by any
overcurrents likely to arise in conductors.
Protection can be achieved by limiting the overcurrent to a safe value or duration.
131.5 Protection against fault curre
...

SLOVENSKI STANDARD
SIST IEC 60364-1:200
01-IHEUXDU-200
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Low-voltage electrical installations - Part 1: Fundamental principles, assessment of
general characteristics, definitions
Installations électriques à basse tension - Partie 1: Principes fondamentaux,
détermination des caractéristiques générales, définitions
Ta slovenski standard je istoveten z: IEC 60364-1
ICS:
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
SIST IEC 60364-1: en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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