IEC 60364-7-721:2007

INTERNATIONAL IEC
STANDARD
CEI
60364-7-721
NORME
First edition
INTERNATIONALE
Première édition
2007-04
Low-voltage electrical installations –
Part 7-721:
Requirements for special installations
or locations – Electrical installations
in caravans and motor caravans

Installations électriques à basse tension –
Partie 7-721:
Exigences pour les installations ou
emplacements spéciaux – Installations
électriques dans les caravanes
et caravanes à moteur
Reference number
Numéro de référence
IEC/CEI 60364-7-721:2007
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INTERNATIONAL IEC
STANDARD
CEI
60364-7-721
NORME
First edition
INTERNATIONALE
Première édition
2007-04
Low-voltage electrical installations –
Part 7-721:
Requirements for special installations
or locations – Electrical installations
in caravans and motor caravans

Installations électriques à basse tension –
Partie 7-721:
Exigences pour les installations ou
emplacements spéciaux – Installations
électriques dans les caravanes
et caravanes à moteur
PRICE CODE
U
CODE PRIX
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur

– 2 – 60364-7-721 © IEC:2007
CONTENTS
FOREWORD.3
INTRODUCTION.5

721 Electrical installations in caravans and motor caravans.6
721.1 Scope.6
721.2 Normative references.6
721.3 Terms and definitions .8
721.31 Purposes, supplies and structure .8
721.313 Supplies .8
721.4 Protection for safety.8
721.41 Protection against electric shock.8
721.413 Protective measure: electrical separation.9
721.414 Protective measure: extra-low voltage provided by SELV and PELV .9
721.43 Protection against overcurrent .9
721.5 Selection and erection of equipment .10
721.51 Common rules.10
721.510 Introduction.10
721.512 Operational conditions and external influences .10
721.514 Identification .10
721.521 Types of wiring systems.10
721.522 Selection and erection of wiring systems in relation to external
influences .11
721.524 Cross-sectional areas of conductors .11
721.526 Electrical connections .11
721.528 Proximity of wiring systems to other services .11
721.53 Isolation, switching and control .11
721.536 Isolation and switching.11
721.543 Protective conductors .12
721.55 Other equipment.12

Annex A (normative) Instructions for electricity supply .14
Annex B (informative) Extra low-voltage d.c. installations .15
Annex C (informative) Current-carrying capacities .22
Annex D (informative) List of notes concerning certain countries .25

Bibliography.26

Figure C.1 – Graph for obtaining minimum cross-sectional area for conductors for
fixed wiring installations with a voltage drop of 0,8 V .22
Figure C.2 – Graph for obtaining minimum cross-sectional area for conductors for
battery cable installations with a voltage drop of 0,3 V.23

Table 721A – Cross-sectional areas of flexible cords and cables for caravan
connection .13
Table B.721.1 – Functional allocation and cross-sectional areas of cores for caravan
connectors.18

60364-7-721 © IEC:2007 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –

Part 7-721: Requirements for special installations or locations –
Electrical installations in caravans and motor caravans

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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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 60364-7-721 has been prepared by IEC technical committee 64:
Electrical installations and protection against electrical shock.
The text of this standard is based on the following documents:
FDIS Report on voting
64/1576/FDIS 64/1596/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.

– 4 – 60364-7-721 © IEC:2007
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The reader’s attention is drawn to the fact that Annex D lists all of the “in-some-country”
clauses on differing practices of a less permanent nature relating to the subject of this
standard.
A list of all the parts in the IEC 60364 series, under the general title Low-voltage electrical
installations, can be found on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
60364-7-721 © IEC:2007 – 5 –
INTRODUCTION
The requirements of this part of IEC 60364 supplement, modify or replace certain of the
general requirements in Parts 1 t
...