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

The requirements o f 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).

Errichten von Niederspannungsanlagen - Teil 7-704: Anforderungen für Betriebsstätten, Räume und Anlagen besonderer Art - Baustellen

Installations électriques à basse tension - Partie 7-704 : Installations de chantiers de construction et de démolition

Les exigences de la présente partie s’appliquent 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).

Nizkonapetostne električne inštalacije - 7-704. del: Zahteve za posebne inštalacije ali lokacije - Gradbišča

Zahteve tega dela standarda IEC 60364 so namenjene inštalacijam za gradbišča, ki se uporabljajo med izvajanjem gradbenih ali rušitvenih del in so ob zaključku del izločene iz uporabe. Primeri vključujejo:
• gradnjo novih stavb;
• popravilo, spremembo, razširitev ali rušitev obstoječih stavb ali delov obstoječih stavb;
• inženirska dela;
• zemeljska dela;
• podobna dela.
Zahteve se uporabljajo za fiksne ali premične inštalacije.
Zahteve se ne uporabljajo za inštalacije na upravnih lokacijah gradbišč (npr. pisarne, garderobe, sejne sobe, jedilnice, restavracije, spalni prostori, stranišča).

General Information

Status
Published
Publication Date
06-Sep-2018
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
06-Jul-2018
Due Date
10-Sep-2018
Completion Date
07-Sep-2018

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SLOVENSKI STANDARD
SIST HD 60364-7-704:2018
01-oktober-2018
1DGRPHãþD
SIST HD 60364-7-704:2007
SIST HD 60364-7-704:2007/A11:2017

1L]NRQDSHWRVWQHHOHNWULþQHLQãWDODFLMHGHO=DKWHYH]DSRVHEQHLQãWDODFLMH

DOLORNDFLMH*UDGELãþD

Low-voltage electrical installations - Part 7-704: Requirements for special installations or

locations - Construction and demolition site installations

Errichten von Niederspannungsanlagen - Teil 7-704: Anforderungen für Betriebsstätten,

Räume und Anlagen besonderer Art - Baustellen

Installations électriques à basse tension - Partie 7-704 : Installations de chantiers de

construction et de démolition
Ta slovenski standard je istoveten z: HD 60364-7-704:2018
ICS:
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
91.200 Gradbena tehnologija Construction technology
SIST HD 60364-7-704:2018 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST HD 60364-7-704:2018
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SIST HD 60364-7-704:2018
HARMONIZATION DOCUMENT HD 60364-7-704
DOCUMENT D'HARMONISATION
HARMONISIERUNGSDOKUMENT
May 2018
ICS 29.020; 91.140.50 Supersedes HD 60364-7-704:2007
English Version
Low voltage electrical installations - Part 7-704: Requirements
for special installations or locations - Construction and demolition
site installations
(IEC 60364-7-704:2017 , modified)

Installations électriques basse tension - Partie 7-704: Errichten von Niederspannungsanlagen - Teil 7-704:

Exigences pour les installations ou emplacements spéciaux Anforderungen für Betriebsstätten, Räume und Anlagen

- Installations de chantiers de construction et de démolition besonderer Art - Baustellen

(IEC 60364-7-704:2017 , modifiée) (IEC 60364-7-704:2017 , modifiziert)

This Harmonization Document was approved by CENELEC on 2017-05-02. CENELEC members are bound to comply with the

CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document at national level.

Up-to-date lists and bibliographical references concerning such national implementations may be obtained on application to the CEN-

CENELEC Management Centre or to any CENELEC member.

This Harmonization Document exists in three official versions (English, French, German).

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. HD 60364-7-704:2018 E
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HD 60364-7-704:2018 (E)
European foreword

The text of document 64/2155/FDIS, future edition 3 of IEC 60364-7-704:2017, prepared by

IEC/TC 64 "Electrical installations and protection against electric shock" was submitted to the

IEC-CENELEC parallel vote and approved by CENELEC as HD 60364-7-704:2018.

A draft amendment, which covers common modifications to IEC 60364-7-704 (64/2155/FDIS),

was prepared by CLC/TC 64 "Electrical installations and protection against electric shock"

and approved by CENELEC.
The following dates are fixed:
(dop) 2018-11-18
• latest date by which this document has to be implemented
at national level by publication of an identical
national standard or by endorsement
(dow) 2021-05-18
• latest date by which the national standards conflicting with
this document have to be withdrawn
HD 60364-7-704:2018 supersedes HD 60364-7-704:2007.
Annexes which are additional to those in IEC 60364-7-704:2017 are prefixed “Z”.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

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HD 60364-7-704:2018 (E)
Introduction
For the purpose of this part, the requirements of HD 60364/HD 384 apply.

The Parts 7XX of HD 60364 contain particular requirements for special installations or

locations which are based on the requirements of the general parts of HD 60364 (Part 1,

Part 4, Part 5 and Part 6). These Parts 7XX have to be considered in conjunction with the

requirements of the general parts.

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

the requirements of the general parts of HD 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 Parts 7XX 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

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

corresponding parts, or clauses of HD 60364 being valid at the time of publication of this part

as indicated in the normative references of this document (dated reference).

If additional requirements or explanations are needed which have no direct relation to general

parts or other Parts 7XX the numbering of such clauses are stated as 712.101, 712.102,

712.103 etc.

NOTE 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 Part 704 may no longer align with the latest

edition of the general part. Dated references should be observed.
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HD 60364-7-704:2018 (E)
704.1 Scope

The requirements of this part 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

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

requirements

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

interchangeability requirements for pin and contact-tube accessories
HD 60364 (all parts), Low voltage electrical installations

HD 60364-4-41:2007, Low-voltage electrical installations – Part 4-41: Protection for safety –

Protection against electric shock

HD 60364-5-537:2016, Low-voltage electrical installations - Part 5-53: Selection and erection

of electrical equipment - Devices for protection, isolation, switching, control and monitoring -

Clause 537: Isolation and switching

EN 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.

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HD 60364-7-704:2018 (E)
704.31 Purpose, supplies and structure
704.313 Supplies
The following note is added:

NOTE A single construction site may be served by several sources of supply, including

generating sets; see HD 60364-5-551.
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 HD 60364-4-41:2007, Annex B shall not be used.
704.410.3.6 Replace with the following:
The protective measures
- non-conducting location,
- earth-free equipotential bonding, and
- electrical separation for the supply of more than one current-using equipment
as specified in HD 60364-4-41:2007, 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 HD

60364-4-41:2007, 415.1.1), or
– be supplied by SELV or PELV (HD 60364-4-41:2007, 414), or

– have electrical separation of circuits (HD 60364-4-41:2007, 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 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
704.414.4.5 Replace the clause with the following:
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HD 60364-7-704:2018 (E)

Irrespective of the nom inal voltage, in AC. and DC circuits, the requirement for basic

protection shall be provided by the following:
– insulation in accordance with HD 60364-4-41:2007, Clause A.1, or
– barriers or enclosures in accordance with HD 60364-4-41:2007, 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 EN 61439-4.
Where interchangeability is required:

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

national standards, and

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

EN 60309-2.
Socket-outlets shall comply with EN 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,

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HD 60364-7-704:2018 (E)
resistant to abrasion and to water.
704.537 Devices for isolation and switching
704.537.2 Devices for isolation
704.537.2.101
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

HD 60364-5-537:2016, 537.2.5) (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.
704.56 Safety services
The following note is added:

NOTE Site conditions may require the provision of safety services, e.g. 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, e.g. 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
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SIST HD 60364-7-704:2018
HD 60364-7-704:2018 (E)
Annex ZB
(normative)
Special national conditions

Special national condition: National characteristic or practice that cannot be changed even over a long

period, e.g. climatic conditions, electrical earthing conditions.
NOTE If it affects harmonization, it forms part of the Harmonization Document.

For the countries in which the relevant special national conditions apply these provisions are

normative, for other countries they are informative.
1 Country 2 Clause 3 Special national condition
IT 704.30.101 In Italy clearances are established in ANNEX IX of Dlgs 81/08

GB 704.313 Protection by reduced low voltage system in which the highest voltage shall not exceed 110

V a.c. between phases and 55 V a.c. to earth (single-phase) or 63,5 V a.c. to earth (three

phases) is considered as a particular application of the protection measure by automatic

disconnection of supply in the TN system according to Clause 411.4. In this case, socket-

outlets do not need the additional protective measures specified below.

IE 704. 410.3.1.01 In IE, only portable equipment with the protective measure Reduced Low Voltage is

permitted for equipment having a rating of 2kVA or less

DE 704.410.3.6 In Germany add the following new sentence at the end of 704.410.36

This requirements does not affect the use of generating sets in accordance with HD 60364-5-

551.
GB 704.411.3 In the United Kingdom, the following applies:

704.411.3.1 A PME earthing facility shall not be used for the means of earthing for an

installation falling within the scope of this section unless all extraneous-conductive-parts are

reliably connected to the main earthing terminal in accordance with Regulation 411.3.1.2.

NOTE: If the PME earthing facility is considered for use, see also BS 7375.

DE 704.411.3.2.101 In DE, for circuits supplying socket-outlets with a rated current exceeding 32 A, residual

current operating devices having a rated residual operating current not exceeding 500 mA

shall be used as disconnection devices.
IT 704.411.3.2.101
In IT, socket-outlets with a rated current exceeding 32 A shall be protected
according to the general rules.
NO 704.411.3.2.101 In NO, the following requirement is added:

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

devices or insulation monitoring devices provided with means for tripping a circuit breaker

shall be used as disconnection devices. The rated residual operating current of the devices

shall:

- in TN and TT systems, not exceed 50 % of the minimum prospective earth fault current in

the circuit, and

- in IT system, not exceeding 3 x the expected leakage current in the circuit during normal

operation.

DE 704.511.101 In DE, plugs and socket-outlets with a rated current above 16 A up to and including 125 A

shall comply with EN 60309-2.

ES 704.511.1 In Spain assemblies on construction sites to be installed in Spain shall comply with 61439-4

and also with the constructive requirements included in UNE 201008-IN

GB 704.511.1 In GB, plugs and socket-outlets with a rated current of 16 A up to 125A shall comply with the

requirements of BS EN 60309-2. Plugs and socket-outlets with a rated current exceeding

125A up to 800A and where interchangeability is not required shall comply with BS EN

60309-1.

IT 704.511.1 In IT, plugs and socket-outlets with a rated current above 16 A up to and including 125 A

shall comply with EN 60309-2.
NL 704.521.11 In NL the following is added:
704.521.11 Selection of wiring
704.521.11.1

Electrical conductors shall be selected and erected according to table 700.A.1 in annex

700.A, under the condition that they are suitable for the applied external influences.

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HD 60364-7-704:2018 (E)
1 Country 2 Clause 3 Special national condition
NL 704.521.12 In NL the following is added:

704.521.12 In addition to clause 704.521.11.1 unarmoured cables with protective earth

screen but without mechanical protection can be buried directly in the ground if simultaneous

compliance is provided with the following:

a) the construction site cables are buried in separate cable routing that is clearly and durably

marked;

b) other pipes/ tubes than the construction site cables may not be placed directly adjacent;

c) clear and reliable drawings of the construction site cable routing shall be present on the

construction site;

d) digging works may only be performed after written permission of the site responsible

contractor and under continuous supervision of a therefore appointed person;
e) the cables are buried at a depth of at least 0,5 m
DE 704.522.8.101 In DE, the following cables are also allowed:

H07BQ-F (EN 50525-2-21) taking into account the thermal effects, such as from welding

sputter

GB 704.522.8.101 In GB, for reduced low voltage systems, low temperature 300/500 V thermoplastic (PVC) or

equivalent flexible cables shall be used.

DE 531.3 In DE, 3-phase socket outlets up to and included 63 A shall be protected by a residual

current protective device of Type B in accordance with EN 62423.
NL 704.536.1 In NL the following is added:
Switch disconnectors have to be easily accessible during working hours.

DE 704.537.101 In DE, fixed connected assembly for construction sites (ACS) with socket-outlets shall

incorporate an isolation and lockable device which is usable by ordinary Persons (BA1). A

lockable enclosure is not sufficient.
NL 704.559.3 In NL the following is added:

In the Netherlands, only class II luminaires shall be used with the exception of:

- fixed installed luminaires not within arm’s reach;

- fixed installed luminaires on board of ships where the external conductive parts are

durably and conductively connected to the ship’s hull;
- luminaires being part of SELV-circuits.
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HD 60364-7-704:2018 (E)
Annex ZB
(informative)
A-deviations

A-deviation: National deviation due to regulations, the alteration of which is for the time being outside

the competence of the CENELEC national member.
This Harmonization Document does not fall under any Directive of the EC.

In the relevant CENELEC countries these A-deviations are valid instead of the provisions of the

Harmonization Document until they have been removed.
4 Country 5 Clause 6 A-deviation

GB 704.30 In GB, BS 7375 Distribution of electricity on construction and demolition sites – Code of practice

also applies.

FR 704.6 In France, the whole part 6 is covered by the following legislation: “Décret" No. 2010-1016 of 30

August 2010 and "arrêté" of 19 april 2012.
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HD 60364-7-704:2018 (E)
Bibliography

EN 50110-1, Operation of electrical installations - Part 1: General requirements. Clause 6.4.4

Construction work and other non-electrical work
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SIST HD 60364-7-704:2018
IEC 60364-7-704
Edition 3.0 2017-03
INTERNATIONAL
STANDARD
Low voltage electrical installations –
Part 7-704: Requirements for special installations or locations – Construction
and demolition site installations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.020; 91.140.50 ISBN 978-2-8322-4020-5

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 15 ----------------------
SIST HD 60364-7-704:2018
– 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

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SIST HD 60364-7-704:2018
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

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

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in the subject dealt with may participate in this preparatory work. International, governmental and non-

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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

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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

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6) All users should ensure that they have the latest edition of this publication.

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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 (includ

...

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