Low-voltage electrical installations - Part 7-704: Requirements for special installations or locations - Construction and demolition site installations

IEC 60364-7-7-704:2017 lays down requirements which apply to installations for construction and demolition sites for use during the period of the construction or demolition work which are intended to be taken out of service upon completion of the works. Examples include the following:
- construction work of new buildings;
- repair, alteration, extension or demolition of existing buildings or parts of existing buildings;
- engineering works;
- earthworks;
- work of similar nature. The requirements apply to fixed or moveable installations. This new edition includes the following significant technical changes with respect to the previous edition:
- clarification of the scope;
- clarification of compliance with standards;
- clarification of devices for isolation.

Installations électriques à basse tension - Partie 7-704: Exigences pour les installations ou emplacements spéciaux - Installations de chantiers de construction et de démolition

IEC 60364-7-7-704:2017 s’applique aux installations pour chantiers de construction et de démolition utilisées lors des travaux de construction ou de démolition et destinées à être retirées du service à l’achèvement des travaux. Ces travaux comprennent par exemple:
- les travaux de construction de nouveaux bâtiments;
- les travaux de réparation, de modification, d’extension ou de démolition de bâtiments existants ou de parties de ces bâtiments;
- les travaux publics;
- les travaux de terrassement; et
- les travaux analogues.
Les exigences s’appliquent aux installations fixes ou mobiles.
Les exigences ne sont pas applicables aux installations de locaux administratifs des chantiers (par exemple bureaux, vestiaires, salles de réunion, cantines, restaurants, dortoirs et locaux sanitaires).
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- clarification du domaine d’application;
- clarification de la conformité aux normes;
- clarification des dispositifs de sectionnement.

General Information

Status
Published
Publication Date
27-Mar-2017
Current Stage
PPUB - Publication issued
Start Date
28-Mar-2017
Completion Date
28-Mar-2017
Ref Project

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IEC 60364-7-704
Edition 3.0 2017-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low voltage electrical installations –
Part 7-704: Requirements for special installations or locations – Construction
and demolition site installations
Installations électriques à basse tension –
Partie 7-704: Exigences pour les installations ou emplacements spéciaux –
Installations de chantiers de construction et de démolition
IEC 60364-7-704:2017-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60364-7-704
Edition 3.0 2017-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low voltage electrical installations –
Part 7-704: Requirements for special installations or locations – Construction
and demolition site installations
Installations électriques à basse tension –
Partie 7-704: Exigences pour les installations ou emplacements spéciaux –
Installations de chantiers de construction et de démolition
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.020; 91.140.50 ISBN 978-2-8322-6107-1

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60364-7-704:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

704 Construction and demolition site installations .................................................................. 6

704.1 Scope .............................................................................................................. 6

704.2 Normative references ....................................................................................... 6

704.3 Terms and definitions ....................................................................................... 7

704.30 Assessment of general characteristics ............................................................. 7

704.31 Purposes, supplies and structure ..................................................................... 7

704.313 Supplies ........................................................................................................... 7

704.4 Protection for safety ......................................................................................... 7

704.41 Protection against electric shock ...................................................................... 7

704.410 Introduction ...................................................................................................... 7

704.411 Protective measure: automatic disconnection of supply .................................... 8

704.414 Protective measure: Extra-low voltage provided by SELV and PELV ................ 8

704.44 Protection against voltage disturbances and electromagnetic

disturbances .................................................................................................... 8

704.443 Protection against transient overvoltages of atmospheric origin or due to

switching .......................................................................................................... 8

704.5 Selection and erection of equipment .............................................................. 8

704.51 Common rules ................................................................................................. 8

704.511 Compliance with standards............................................................................... 8

704.512 Operational conditions and external influences .................................................. 9

704.52 Wiring systems ................................................................................................. 9

704.53 Isolation, switching and control ........................................................................ 9

704.536 Isolation and switching ..................................................................................... 9

704.56 Safety services .............................................................................................. 10

704.6 Verification ..................................................................................................... 10

Annex A (informative) List of notes concerning certain countries .......................................... 11

Bibliography .......................................................................................................................... 15

---------------------- Page: 4 ----------------------
IEC 60364-7-704:2017 © IEC 2017 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW VOLTAGE ELECTRICAL INSTALLATIONS –
Part 7-704: Requirements for special installations or locations –
Construction and demolition site installations
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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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 60364-7-704 has been prepared by IEC technical committee 64:

Electrical installations and protection against electric shock.

This bilingual version (2018-10) corresponds to the monolingual English version, published in

2017-03.

This third edition cancels and replaces the second edition published in 2005. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) clarification of the Scope;
b) clarification of compliance with standards;
c) clarification of devices for isolation.
---------------------- Page: 5 ----------------------
– 4 – IEC 60364-7-704:2017 © IEC 2017
The text of this International Standard is based on the following documents:
FDIS Report on voting
64/2155/FDIS 64/2167/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.
The French version of this standard has not been voted upon.

This document 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 A lists all of the “in-some-countries”

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 document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 60364-7-704:2017 © IEC 2017 – 5 –
INTRODUCTION

For the purpose of this part of IEC 60364 (IEC 60364-7-704) the requirements of the general

parts 1 to 6 of IEC 60364 apply.

The IEC 60364-7-7XX parts of IEC 60364 contain particular requirements for special

installations or locations which are based on the requirements of the general parts of

IEC 60364 (IEC 60364-1 to IEC 60364-6). These IEC 60364-7-7XX parts are considered in

conjunction with the requirements of the general parts.

The particular requirements of this part of IEC 60364 supplement, modify or replace certain of

the requirements of the general parts of IEC 60364 being valid at the time of publication of

this part. The absence of reference to the exclusion of a part or a clause of a general part

means that the corresponding clauses of the general part are applicable (undated reference).

Requirements of other 7XX parts being relevant for installations covered by this part also

apply. This part may therefore also supplement, modify or replace certain of these

requirements valid at the time of publication of this part.

The clause numbering of this part follows the pattern and corresponding references of

IEC 60364. The numbers following the particular number of this part are those of the

corresponding parts, or clauses of the other parts of the IEC 60364 series, valid at the time of

publication of this part, as indicated in the normative references of this document (dated

reference).

If requirements or explanations additional to those of the other parts of the IEC 60364 series

are needed, the numbering of such items appears as 704.101, 704.102, 704.103 etc.

In the case where new or amended general parts with modified numbering were published

after this part was issued, the clause numbers referring to a general part in this 704 part may

no longer align with the latest edition of the general part. Dated references should be

observed.
---------------------- Page: 7 ----------------------
– 6 – IEC 60364-7-704:2017 © IEC 2017
LOW VOLTAGE ELECTRICAL INSTALLATIONS –
Part 7-704: Requirements for special installations or locations –
Construction and demolition site installations
704 Construction and demolition site installations
704.1 Scope

The requirements of this part of IEC 60364 apply to installations for construction and

demolition sites for use during the period of the construction or demolition work which are

intended to be taken out of service upon completion of the works. Examples include the

following:
• construction work of new buildings;

• repair, alteration, extension or demolition of existing buildings or parts of existing

buildings;
• engineering works;
• earthworks;
• work of similar nature.
The requirements apply to fixed or moveable installations.

The requirements do not apply to installations in administrative locations of construction

sites (e.g. offices, cloakrooms, meeting rooms, canteens, restaurants, dormitories, toilets).

704.2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements 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 60245-4, Rubber insulated cables – Rated voltages up to and including 450/750 V –

Part 4: Cords and flexible cables

IEC 60309-1, Plugs, socket-outlets and couplers for industrial purposes – Part 1: General

requirements

IEC 60309-2, Plugs, socket-outlets and couplers for industrial purposes – Part 2: Dimensional

interchangeability requirements for pin and contact-tube accessories
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
---------------------- Page: 8 ----------------------
IEC 60364-7-704:2017 © IEC 2017 – 7 –

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 61439-4, Low-voltage switchgear and controlgear assemblies – Part 4: Particular

requirements for assemblies for construction sites (ACS)
704.3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
704.30 Assessment of general characteristics

704.30.101 The clearances for overhead lines above construction sites shall be agreed with

the owner of the overhead power line, on the basis of the dimensions of the construction site

machines, such as cranes, and equipment, such as ladders and scaffolding, to be used.

704.31 Purposes, supplies and structure
704.313 Supplies
The following note is added:

NOTE A single construction site can be served by several sources of supply, including generating sets; see

IEC 60364-5-55:2011, Clause 551.
704.4 Protection for safety
704.41 Protection against electric shock
704.410 Introduction
704.410.3 General requirements
704.410.3.5 Replace with the following:
The protective measures:
• obstacles, and
• placing out of reach
as specified in IEC 60364-4-41:2005, Annex B shall not be used.
704.410.3.6 Replace with the following:
The protective measures
_____________

A consolidated version of this publication exists, comprising IEC 60364-5-53:2001, IEC 60364-5-53:2001/AMD

1:2002 and IEC 660364-5-53:2001/AMD 2:2015.
---------------------- Page: 9 ----------------------
– 8 – IEC 60364-7-704:2017 © IEC 2017
• non-conducting location,
• earth-free equipotential bonding, and
• electrical separation for the supply of more than one current-using equipment
as specified in IEC 60364-4-41:2005, Annex C shall not be used.

704.410.3.101 Circuits supplying socket-outlets with rated current up to and including 32 A

and other circuits supplying hand-held electrical equipment with rated current up to and

including 32 A shall:

• be protected by automatic disconnection of supply together with additional protection by

the use of residual current devices having a rated residual operating current not exceeding

30 mA (see IEC 60364-4-41:2005, 415.1.1), or
• be supplied by SELV or PELV (see IEC 60364-4-41:2005, 414), or

• have electrical separation of circuits (see IEC 60364-4-41:2005, 413), each socket-outlet

and hand-held electrical equipment being supplied by an individual isolating transformer or

by separate windings of an isolating transformer.
704.411 Protective measure: automatic disconnection of supply
704.411.3 Requirements for fault protection
704.411.3.2 Automatic disconnection in case of a fault

704.411.3.2.101 For circuits supplying socket-outlets with a rated current exceeding 32 A,

residual current devices shall be used as disconnection devices.
704.414 Protective measure: Extra-low voltage provided by SELV and PELV
704.414.4 Requirements for SELV and PELV circuits
subclause with the following:
704.414.4.5 Replace the

Irrespective of the nominal voltage, in AC and DC circuits, the requirement for basic

protection shall be provided by the following:
• insulation in accordance with IEC 60364-4-41:2005, Clause A.1, or
• barriers or enclosures in accordance with IEC 60364-4-41:2005, Clause A.2.
704.44 Protection against voltage disturbances and electromagnetic disturbances

704.443 Protection against transient overvoltages of atmospheric origin or due to

switching
704.443.1 General

704.443.1.101 Cranes, lifts, cement mixers and similar items of equipment are liable to

produce switching overvoltages. Where such equipment is present, consideration should be

given to the need for protection against switching overvoltages.
704.5 Selection and erection of equipment
704.51 Common rules
704.511 Compliance with standards
704.511.1 Add the following:

All assemblies on construction and demolition sites (ACS) for the distribution of electricity

shall be in compliance with the requirements of IEC 61439-4.
---------------------- Page: 10 ----------------------
IEC 60364-7-704:2017 © IEC 2017 – 9 –
Where interchangeability is required:

• socket-outlets with a rated current not exceeding 16 A shall comply with IEC 60309-2 or

relevant national standards, and

• socket-outlets with a rated current exceeding 16 A but not exceeding 125 A shall comply

with IEC 60309-2.
Socket-outlets shall comply with IEC 60309-1 where:
• the rated current exceeds 125 A, or
• interchangeability is not required.
704.512 Operational conditions and external influences
704.512.2 External influences
Add the following:

Consideration shall be given to the risk of damage to electrical equipment by corrosive

substances, movement of structures and vehicles, wear and tear, tension, flexing, impact,

abrasion, severing and ingress of liquids or solids.
704.52 Wiring systems
704.522.8 Other mechanical stresses (AJ)
704.522.8.101

To avoid damage, cables should not be run across site roads or walkways. Where this is

necessary, special protection against mechanical damage and contact with construction plant

machinery shall be provided.

Particular attention shall be given to the protection of surface run and overhead cables

against mechanical damage, given the environment and activities at the construction site.

Flexible cables that are subject to movement shall be IEC 60245-4 type 66 or equivalent,

resistant to abrasion and to water.
704.53 Isolation, switching and control
704.536 Isolation and switching
704.536.2 Isolation
704.536.2.2 Devices for isolation
The following requirements are added:

Each assembly for construction sites (ACS) shall incorporate devices for isolating the

incoming supply.

Devices for isolating the incoming supply shall be suitable for securing in the off position

(see IEC 60364-5-53:2001, 536.2.1.2) (for example, by providing a padlocking facility on

the device or by locating the device inside a lockable enclosure). Safety and standby

supplies shall be connected by means of devices arranged to prevent interconnection of

the different supplies.
---------------------- Page: 11 ----------------------
– 10 – IEC 60364-7-704:2017 © IEC 2017
704.56 Safety services
Add the following:

Site conditions may require the provision of safety services, for example escape lighting.

704.6 Verification

704.6.101 Site work is in a constant state of change and, therefore, the associated electrical

installation is subject to risk of damage or misuse. Therefore, in addition to initial and periodic

verification, the installation shall be inspected frequently, for example daily, weekly, or

monthly, as appropriate. Examples of some items to be inspected include:
• the adequacy of connections and the condition of the protective conductors;

• the condition of flexible conductors and their connections to portable equipment and hand-

held equipment;

• the rating and condition of fuses and the setting of the circuit-breakers to ensure that they

are not unduly altered;
• the functioning of residual current devices.
---------------------- Page: 12 ----------------------
IEC 60364-7-704:2017 © IEC 2017 – 11 –
Annex A
(informative)
List of notes concerning certain countries
Country Clause/ Nature Rationale Wording
Subclause No. (permanent or (detailed
less permanent justification for
according to the requested
IEC Directives) country note)
IT 704.30.101 In Italy clearances are established
in ANNEX IX of Dlgs 81/08.
FR 704.410.3.101 In France, all final circuits supplying
socket-outlets shall be protected by:
– residual current devices having a
rated residual operating current
not exceeding 30 mA, or
– be supplied by SELV or PELV, or
– have electrical separation of
circuits, each socket-outlet and
handheld electrical equipment
being supplied by an individual
isolating transformer or by
separate windings of an isolating
transformer.
FI 704.410.3.101 In Finland, circuits supplying
socket-outlets with rated current up
to and including 32 A that supply
other ACSs are exempted provided
that constructional provisions or
warning signs for these socket-
outlets have been provided to avoid
misuse.
GB 704.410.3.101 In Great Britain, the use of a
reduced low voltage system is also
permitted.
In Hungary, if the environmental
HU 704.410.3.101
conditions require it, then residual
current devices with rated residual
operating current of 100 mA can be
used.
IE 704.410.3.101 In Ireland, the protective measure
”electrical separation” is not
permitted.
IE 704.410.3.101 In Ireland, only portable equipment
with the protective measure
Reduced Low Voltage is permitted
for equipment having a rating of
2kVA or less.
NL 704.410.3.101 In the Netherlands, circuits
supplying socket-outlets with rated
current up to and including 32 A
that supply other assemblies for
construction sites (ACS) are
exempted provided that
constructional provisions for these
socket-outlets have been provided
to avoid misuse.
SE 704.410.3.101 In Sweden, the requirement of this
clause applies for socket-outlets
with rated current up to and
including 16 A.
---------------------- Page: 13 ----------------------
– 12 – IEC 60364-7-704:2017 © IEC 2017
Country Clause/ Nature Rationale Wording
Subclause No. (permanent or (detailed
less permanent justification for
according to the requested
IEC Directives) country note)
GB 704.411.3 In Great Britain, a PME earthing
facility shall not be used for the
means of earthing for an installation
falling within the scope of this
document unless all extraneous-
conductive-parts are reliably
connected to the main earthing
terminal in accordance with
IEC 60364-4-41:2005, 411.3.1.2.
...

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