IEC 60092-502:1999
(Main)Electrical installations in ships - Part 502: Tankers - Special features
Electrical installations in ships - Part 502: Tankers - Special features
General Information
Standards Content (Sample)
INTERNATIONAL
IEC
STANDARD
60092-502
Fifth edition
1999-02
Electrical installations in ships –
Part 502:
Tankers –
Special features
Installations électriques à bord des navires –
Partie 502:
Navires-citernes –
Caractéristiques spéciales
Reference number
Numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series.
Consolidated publications
Consolidated versions of some IEC publications including amendments are
available. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the
base publication, the base publication incorporating amendment 1 and the base
publication incorporating amendments 1 and 2.
Validity of this publication
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology.
Information relating to the date of the reconfirmation of the publication is available
in the IEC catalogue.
Information on the subjects under consideration and work in progress undertaken by
the technical committee which has prepared this publication, as well as the list of
publications issued, is to be found at the following IEC sources:
• IEC web site*
• Catalogue of IEC publications
Published yearly with regular updates
(On-line catalogue)*
• IEC Bulletin
Available both at the IEC web site* and as a printed periodical
Terminology, graphical and letter symbols
For general terminology, readers are referred to IEC 60050: International Electro-
technical Vocabulary (IEV).
For graphical symbols, and letter symbols and signs approved by the IEC for
general use, readers are referred to publications IEC 60027: Letter symbols to be
used in electrical technology, IEC 60417: Graphical symbols for use on equipment.
Index, survey and compilation of the single sheets and IEC 60617: Graphical symbols
for diagrams.
* See web site address on title page.
INTERNATIONAL
IEC
STANDARD
60092-502
Fifth edition
1999-02
Electrical installations in ships –
Part 502:
Tankers –
Special features
Installations électriques à bord des navires –
Partie 502:
Navires-citernes –
Caractéristiques spéciales
IEC 1999 Copyright - all rights reserved
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 the publisher.
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Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
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International Electrotechnical Commission
For price, see current catalogue
– 2 – 60092-502 © IEC:1999(E)
CONTENTS
Page
FOREWORD . 4
INTRODUCTION . 5
Clause
1 Scope. 6
2 Normative references. 6
3 Definitions. 7
4 Area classification. 11
4.1 General. 11
4.2 Tankers carrying flammable liquids other than liquefied gases having
a flashpoint not exceeding 60 °C, for example crude oil, oil products,
chemical products. 15
4.3 Tankers carrying flammable liquids having a flashpoint exceeding 60 °C . 17
4.4 Tankers carrying flammable liquefied gases. 17
4.5 Tankers carrying cargoes (for example acids) reacting with other
products/materials to evolve flammable gases . 18
5 Electrical systems. 18
5.1 Sources of electrical power . 18
5.2 Distribution systems. 18
5.3 Electrical protection. 18
5.4 Equipotential bonding. 19
5.5 Static electricity. 19
5.6 Lightning protection. 20
5.7 Cathodically protected metallic parts . 20
5.8 Electromagnetic radiation. 20
6 Electrical equipment. 20
6.1 General. 20
6.2 Selection of electrical equipment. 20
6.3 Certified safe type equipment. 22
6.4 Electrical equipment of the type “n” and that which ensures the absence
of sparks and arcs and of “hot spots” during its normal operation. . 22
6.5 Electrical equipment in hazardous areas . 23
6.6 Movable equipment. 24
7 Installation. 24
7.1 General. 24
7.2 Selection of apparatus. . 25
7.3 Wiring system – general . 25
7.4 Cable wiring systems . 25
60092-502 © IEC:1999(E) – 3 –
7.5 Connection of cables . 25
7.6 Cable joints. 25
8 Ventilation and pressurisation . 26
8.1 General. 26
8.2 Design principles. 27
8.3 Ventilation related to area classification . 27
8.4 Protection by over-pressure . 27
9 Inspection and maintenance. 29
9.1 General. 29
9.2 Inspection and testing. 29
9.3 Isolation of apparatus . 29
9.4 Maintenance. 29
9.5 Qualifications of personnel. 29
10 Documentation. 29
10.1 Area classification. 29
10.2 Equipment. 30
10.3 Installation. 31
10.4 Maintenance. 32
10.5 Administration of the documentation . 32
Annexes
A (informative) Examples of hazardous area classification – Basic principles . 33
B (informative) Examples of hazardous area classification – Tankers carrying flammable
liquids other than liquefied gases having a flashpoint not exceeding 60 °C,
for example, crude oil, oil products, chemical products. 37
C (informative) Examples of hazardous area classification – Tankers carrying flammable
liquids having a flashpoint exceeding 60 °C – Unheated cargoes
and cargoes heated to temperature (TH) below, and not within 15 °C of,
their flashpoint (FP). . 40
D (informative) Examples of hazardous area classification – Tankers carrying flammable
liquefied gases . 41
E (informative) Examples of hazardous area classification – Tanker carrying cargoes
(for example acids) reacting with other products/materials to evolve
flammable gases . 43
– 4 – 60092-502 © IEC:1999(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSTALLATIONS IN SHIPS –
Part 502: Tankers – Special features
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60092-502 has been prepared by IEC technical committee 18:
Electrical installations of ships and of mobile and fixed offshore units.
This fifth edition cancels and replaces the fourth edition published in 1994.
The text of this standard is based on the following documents:
FDIS Report on voting
18/853/FDIS 18/862/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.
Annexes A, B, C, D and E are for information only.
A bilingual version of this standard may be issued at a later date.
60092-502 © IEC:1999(E) – 5 –
INTRODUCTION
This standard introduces the zonal concept for hazardous area classification and permits the
use of earthed distribution systems.
It should be noted, however, that it is not in full concurrence with the requirements for electrical
)
installations in hazardous areas given in Clause 10.2 of the IBC Code and Clause 10.2 of the
)
IGC Code and the system earthing requirements of Regulations II-1/45.4.1 and 45.4.3 of
)
SOLAS .
Until the International Maritime Organization has decided upon corresponding amendments to
the Codes and to SOLAS, users of this standard are advised to ask the appropriate authority to
consider equivalence in accordance with the “Equivalents” provisions of Clause 1.4 of the IBC
Code and Clause 1.4 of the IGC Code and Regulation I/5 of SOLAS.
__________
)
International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk (1994
edition).
)
International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (1993 edition).
)
SOLAS – the International Convention for the Safety of Life at Sea, 1974, and its Protocol of 1978
(Consolidated edition, 1997).
– 6 – 60092-502 © IEC:1999(E)
ELECTRICAL INSTALLATIONS IN SHIPS –
Part 502: Tankers – Special features
1 Scope
This part of IEC 60092 deals with the electrical installations in tankers carrying liquids which
are flammable, either inherently, or due to their reaction with other substances, or flammable
liquefied gases.
The requirements in other parts of IEC 60092 also apply to
...
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