IEC 61892-7:2014

Mobile and fixed offshore units - Electrical installations - Part 7: Hazardous areas

IEC 61892-7:2014 contains provisions for hazardous areas classification and choice of electrical installation in hazardous areas in mobile and fixed offshore units, including pipelines, pumping or 'pigging' stations, compressor stations and exposed location single buoy moorings, used in the offshore petroleum industry for drilling, processing and for storage purposes. It applies to all installations, whether permanent, temporary, transportable or hand-held, to AC installations up to and including 35 000 V and DC installations up to and including 1 500 V. (AC and DC voltages are nominal values). This standard does not apply to electrical installations in rooms used for medical purposes, or in tankers. This edition includes the following significant technical changes with respect to the previous edition.
a) The EPL (Explosion Protection Level) concept has been introduced.
b) The requirements to installations in hazardous area has been rewritten, based on the requirements of IEC 60079-14:2013.

Unités mobiles et fixes en mer - Installations électriques - Partie 7: Emplacements dangereux

L'IEC 61892-7:2014 contient des dispositions sur le classement des emplacements dangereux et le choix d'une installation électrique pour les unités mobiles et fixes en mer correspondantes, dont les tuyaux, les stations de pompage ou de raclage, les stations de compression et les bouées d'amarrage par point unique pour les situations exposées dans le secteur pétrolier offshore pour les processus de forage, de traitement et de stockage. Elle s'applique à toutes les installations, qu'elles soient permanentes ou provisoires, mobiles ou portatives, en courant alternatif jusqu'à 35 000 V inclus ou en courant continu jusqu'à 1 500 V inclus (les tensions alternatives et continues sont des valeurs nominales). La présente norme ne s'applique pas aux installations électriques présentes dans les salles à vocation médicale ni sur les navires-citernes. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente.
a) Le concept EPL (niveau de protection contre l'explosion, Explosion Protection Level) a été introduit.
b) Les exigences applicables aux installations situées sur des emplacements dangereux ont été reformulées à partir de celles de l'IEC 60079-14:2013.

General Information

• Status: Published
• Publication Date: 10-Dec-2014
• ICS: 47.020.60 - Electrical equipment of ships and of marine structures
• Technical Committee: TC 18 - Electrical installations of ships and of mobile and fixed offshore units
• Drafting Committee: MT 18 - TC 18/MT 18
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 09-Apr-2019

Relations

• Revised: IEC 61892-7:2019 - Mobile and fixed offshore units - Electrical installations - Part 7: Hazardous areas
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61892-7


®


Edition 3.0 2014-12



INTERNATIONAL



STANDARD



NORME
INTERNATIONALE
colour
inside


Mobile and fixed offshore units – Electrical installations –
Part 7: Hazardous areas

Unités mobiles et fixes en mer – Installations électriques –
Partie 7: Emplacements dangereux

IEC 61892-7:2014-12(en-fr)

---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED


Copyright © 2014 IEC, Geneva, Switzerland


All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or

your local IEC member National Committee for further information.



Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie

et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des

questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch

About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 14
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 55 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: [e-mail].


A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.


Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient plus de 30 000 termes et définitions en
Spécifications techniques, Rapports techniques et autres
anglais et en français, ainsi que les termes équivalents dans
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
14 langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.


Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
Plus de 55 000 entrées terminologiques électrotechniques, en
La recherche avancée permet de trouver des publications IEC
en utilisant différents critères (numéro de référence, texte, anglais et en français, extraites des articles Termes et
comité d’études,…). Elle donne aussi des informations sur les Définitions des publications IEC parues depuis 2002. Plus
projets et les publications remplacées ou retirées. certaines entrées antérieures extraites des publications des

CE 37, 77, 86 et CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished

Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications IEC. Just
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
[e-mail].

---------------------- Page: 2 ----------------------
IEC 61892-7



®



Edition 3.0 2014-12







INTERNATIONAL





STANDARD







NORME



INTERNATIONALE
colour

inside










Mobile and fixed offshore units – Electrical installations –

Part 7: Hazardous areas




Unités mobiles et fixes en mer – Installations électriques –

Partie 7: Emplacements dangereux

















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX XC


ICS 47.020.60 ISBN 978-2-8322-1986-7



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 61892-7:2014 © IEC 2014


CONTENTS


FOREWORD . 8

INTRODUCTION . 10


1 Scope . 11

2 Normative references . 11

3 Terms and definitions . 13

4 Area classification . 20

4.1 General . 20

4.2 Safety principles . 20
4.3 Sources of release . 21
4.4 Type of zone . 22
4.5 Relative density of the gas or vapour when it is released . 22
4.6 Mobile drilling units . 22
4.6.1 General . 22
4.6.2 Zone 0 . 23
4.6.3 Zone 1 . 23
4.6.4 Zone 2 . 23
4.6.5 Well test facilities . 23
4.7 Fixed units . 24
4.7.1 General . 24
4.7.2 Zone 0 . 24
4.7.3 Zone 1 . 24
4.7.4 Zone 2 . 24
4.7.5 Drilling facilities . 24
4.8 Floating production units . 24
4.9 Provisions regarding all types of offshore units (floating, mobile and fixed
units) . 25
4.10 Openings, access and ventilation conditions affecting the extent of
hazardous areas . 25
4.10.1 General . 25
4.10.2 Enclosed space with direct access to any zone 1 location . 25
4.10.3 Enclosed space with direct access to any zone 2 location . 25
4.10.4 Warning notices . 26
5 Electrical systems . 26

5.1 Sources of electrical power . 26
5.2 Distribution systems . 26
5.2.1 General . 26
5.2.2 Earth fault detection . 26
5.3 Electrical protection . 26
5.4 Emergency conditions due to drilling operations – Mobile drilling units . 27
5.5 Emergency switch-off – Ignition source control –Production units . 28
5.5.1 General . 28
5.5.2 Low gas alarm . 28
5.5.3 High gas alarm . 29
5.5.4 Manual disconnection . 29
6 Protection from dangerous (incendive) sparking . 29
6.1 General . 29
6.2 Light metal as construction materials . 29

---------------------- Page: 4 ----------------------
IEC 61892-7:2014 © IEC 2014 – 3 –


6.3 Dangers from live parts . 29

6.4 Dangers from exposed and extraneous conductive parts . 29

6.4.1 General . 29

6.4.2 System with earthed neutral . 30

6.4.3 System with isolated or impedance earthed neutral . 30

6.4.4 Systems in zone 0 . 30

6.4.5 SELV and PELV systems . 30

6.4.6 Electrical separation . 30

6.4.7 Non Ex electrical equipment above hazardous areas . 30

6.5 Potential equalization . 31

6.5.1 General . 31
6.5.2 Temporary bonding . 31
6.6 Static electricity . 32
6.7 Cathodically protected metallic parts . 32
6.8 Electromagnetic radiation. 32
6.9 Danger from mechanical parts . 32
7 Assurance of conformity of equipment . 33
7.1 Equipment with certificates according to IEC standards . 33
7.1.1 General . 33
7.1.2 IEC standards . 33
7.1.3 Equipment without certificates according to IEC standards . 33
7.2 Selection of repaired, second hand or existing equipment . 33
7.3 Qualifications of personnel . 33
8 Selection of equipment (excluding cables and conduits) . 34
8.1 General . 34
8.2 Information requirements . 34
8.3 Zones . 34
8.4 Relationship between equipment protection levels (EPLs) and zones . 34
8.5 Selection of equipment according to EPLs . 34
8.5.1 General . 34
8.5.2 Relationship between EPLs and types of protection . 35
8.5.3 Equipment for use in locations requiring EPL 'Ga' . 35
8.5.4 Equipment for use in locations requiring EPL ‘Gb’. 35
8.5.5 Equipment for use in locations requiring EPL ‘Gc’ . 36
8.6 Selection according to equipment grouping . 36

8.7 Selection according to the ignition temperature of the gas or vapour and
ambient temperature . 36
8.7.1 General . 36
8.7.2 Gas or vapour . 37
8.8 Selection of radiating equipment . 37
8.9 Selection of ultrasonic equipment . 37
8.10 Selection to cover external influences . 37
8.11 Selection of transportable, portable and personal equipment . 38
8.11.1 Transportable and portable equipment . 38
8.11.2 Personal equipment . 38
8.12 RFID tags . 39
9 Cable system – General . 39
9.1 Cables . 39
9.2 Connections . 39

---------------------- Page: 5 ----------------------
– 4 – IEC 61892-7:2014 © IEC 2014


9.3 Jointing . 40

9.4 Cable system . 40

9.4.1 Construction . 40

9.4.2 Earthing of metallic covering . 40

9.5 Conduit systems . 40

9.6 Cable and conduit systems . 41

9.6.1 Zone 0, EPL 'Ga' . 41

9.6.2 Cable and conduit systems for zone 1 and 2, EPL, ‘Gb’ and ‘Gc’ . 41

9.7 Installation requirements . 42

9.7.1 Circuits traversing a hazardous area . 42

9.7.2 Terminations . 42
9.7.3 Unused cores . 42
10 Cable entry systems and blanking elements . 42
10.1 General . 42
10.2 Connections of cables to equipment . 42
10.3 Selection of cable glands . 43
10.4 Additional entries other than Ex ’d’ or Ex ’nR’ . 44
10.5 Unused openings . 44
10.6 Additional requirements for type of protection 'd' – Flameproof enclosures . 44
10.6.1 General . 44
10.6.2 Selection of cable glands . 45
10.7 Additional requirements for type of protection 'nR' – Restricted breathing
enclosure . 45
11 Rotating electrical machines . 45
11.1 Type of protection 'd' – Flameproof enclosures . 45
11.2 Type of protection 'e' – Increased safety . 45
11.3 Type of protection 'p' – Pressurized enclosures . 45
11.4 Type of protection 'nA' – Non-sparking . 45
11.5 Ex protected permanent magnet motor . 46
12 Electric heating systems . 46
12.1 General . 46
12.2 Temperature monitoring . 46
12.3 Limiting temperature . 46
12.4 Safety device . 46
12.5 Electrical trace heating systems . 47

13 Additional requirements for type of protection 'd' – Flameproof enclosures . 47
13.1 General . 47
13.2 Solid obstacles . 48
13.3 Protection of flameproof joints. 48
13.4 Conduit systems . 49
14 Additional requirements for type of protection ‘e’ – Increased safety . 49
14.1 General . 49
14.2 Maximum dissipated power of terminal box enclosures . 49
14.3 Conductor terminations . 50
14.4 Maximum number of conductors in relation to the cross-section and the
permissible continuous current . 50
15 Additional requirements for type of protection 'i' – Intrinsic safety . 50
15.1 Introductory remark . 50
15.2 Earthing of intrinsically safe circuits . 51

---------------------- Page: 6 ----------------------
IEC 61892-7:2014 © IEC 2014 – 5 –


15.3 Earthing of conducting screens . 52

15.4 Cable braid bonding . 52

15.5 Verification of intrinsically safe circuits . 52

15.6 Simple apparatus . 52

16 Additional requirements for pressurized enclosures . 53

16.1 General . 53

16.2 Type of protection 'p'. 53

16.2.1 General . 53

16.2.2 Ducting . 54


16.2.3 Action to be taken on failure of pressurization . 54
16.2.4 Multiple pressurized enclosures with a common safety device . 56
16.2.5 Purging . 57
16.2.6 Protective gas. 57
17 Pressurized rooms . 57
17.1 General . 57
17.2 Doors . 58
17.3 Inlets and outlets . 58
17.4 Clean air supply . 58
17.4.1 Source of clean air . 58
17.4.2 Minimum flow rate . 58
17.5 Purging . 58
17.5.1 General . 58
17.5.2 Sequence of operations of the purging safety devices . 59
17.5.3 Enclosures within the room . 59
17.6 Safety devices . 59
17.6.1 General . 59
17.6.2 Safety devices based on type of protection . 60
17.7 Failure of the pressurization system . 60
17.8 Pressurized room in a hazardous area . 60
General . 60
17.8.2 Preventing the explosive atmosphere from entering an open door . 60
17.9 Gas detection . 61
17.10 Action when pressurization system fails . 61
17.10.1 Type of protection 'px'. 61
17.10.2 Type of protection 'py'. 61

17.10.3 Re-energizing the room . 62
17.11 Marking . 62
18 Analyser houses . 62
19 Additional requirements for type of protection 'n' . 62
20 Additional requirements for type of protection 'o'– Oil immersion . 63
21 Additional requirements for type of protection 'q' – Powder filling . 63
22 Additional requirements for type of protection 'm' – Encapsulation . 63
23 Additional requirements for type of protection 'op' – Optical radiation . 63
24 Ventilation . 63
24.1 General . 63
24.2 Ventilation of spaces containing electrical apparatus . 64
24.3 Ventilation of other hazardous spaces. 64
25 Ventilation requirements for battery compartments .
...