SIST EN 60079-0:2004
(Main)Electrical apparatus for explosive gas atmospheres -- Part 0: General requirements
Electrical apparatus for explosive gas atmospheres -- Part 0: General requirements
Supersedes EN 50014:1997 + A1:1999 + A2:1999 * Corrigendum to EN issued April 2004
Elektrische Betriebsmittel für gasexplosionsgefährdete Bereiche -- Teil 0: Allgemeine Anforderungen
Matériel électrique pour atmosphères explosives gazeuses -- Partie 0: Règles générales
Električne naprave za eksplozivne plinske atmosfere - 0. del: Splošne zahteve (IEC 60079-0:2004)
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Standards Content (Sample)
SLOVENSKI SIST EN 60079-0:2004
STANDARD
junij 2004
Električne naprave za eksplozivne plinske atmosfere - 0. del: Splošne zahteve
(IEC 60079-0:2004)
Electrical apparatus for explosive gas atmospheres - Part 0: General requirements
ICS 29.260.20 Referenčna številka
SIST EN 60079-0:2004(en)
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
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EUROPEAN STANDARD EN 60079-0
NORME EUROPÉENNE
EUROPÄISCHE NORM March 2004
ICS 29.260.20 Supersedes EN 50014:1997 + A1:1999 + A2:1999
Incorporates Corrigendum April 2004
English version
Electrical apparatus for explosive gas atmospheres
Part 0: General requirements
(IEC 60079-0:2004)
Matériel électrique pour atmosphères Elektrische Betriebsmittel für
explosives gazeuses gasexplosionsgefährdete Bereiche
Partie 0: Règles générales Teil 0: Allgemeine Anforderungen
(CEI 60079-0:2004) (IEC 60079-0:2004)
This European Standard was approved by CENELEC on 2004-03-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-0:2004 E
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EN 60079-0:2004 - 2 -
Foreword
The text of document 31/474A/FDIS, future edition 4 of IEC 60079-0, prepared by IEC TC 31,
Electrical apparatus for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and
was approved by CENELEC as EN 60079-0 on 2004-03-01.
This European Standard supersedes EN 50014:1997 + A1:1999 + A2:1999.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2004-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2007-03-01
This European Standard was prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and supports the essential requirements of
Directive 94/9/EC.
Annex ZA has been added by CENELEC.
The contents of the corrigendum of April 2004 have been included in this copy.
__________
Endorsement notice
The text of the International Standard IEC 60079-0:2004 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60079-14 NOTE Harmonized as EN 60079-14:2003 (not modified).
IEC 60079-17 NOTE Harmonized as EN 60079-17:2003 (not modified).
__________
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- 3 - EN 60079-0:2004
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application 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.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1) 2)
IEC 60034-5 - Rotating electrical machines EN 60034-5 2001
Part 5: Degrees of protection provided
by the integral design of rotating
electrical machines (IP code) –
Classification
1) 2)
IEC 60079-1 - Electrical apparatus for explosive gas EN 60079-1 2004
atmospheres
Part 1: Flameproof enclosures 'd'
1)
IEC 60079-2 - Part 2: Pressurized enclosures "p" - -
1)
IEC 60079-4 - Part 4: Method of test for ignition - -
temperature
1)
IEC 60079-5 - Part 5: Powder filling 'q' - -
1)
IEC 60079-6 - Part 6: Oil-immersion "o" - -
1) 2)
IEC 60079-7 - Part 7: Increased safety "e" EN 60079-7 2003
1) 2)
IEC 60079-10 - Part 10: Classification of hazardous EN 60079-10 2003
areas
1)
IEC 60079-11 - Part 11: Intrinsic safety "i" - -
1) 2)
IEC 60079-15 - Part 15: Type of protection "n" EN 60079-15 2003
(mod)
1)
IEC 60079-18 - Part 18: Encapsulation "m" - -
1) 2)
IEC 60079-25 - Part 25: Intrinsically safe systems EN 60079-25 2004
3)
IEC 60079-26 - Part 26: Construction, test and marking - -
of Group II Zone 0 electrical apparatus
1) 2)
IEC 60086-1 - Primary batteries EN 60086-1 2001
Part 1: General
1)
Undated reference.
2)
Valid edition at date of issue.
3)
To be published.
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EN 60079-0:2004 - 4 -
Publication Year Title EN/HD Year
1) 2)
IEC 60095-1 - Lead-acid starter batteries EN 60095-1 1993
(mod) Part 1: General requirements and
methods of test
1) 2)
IEC 60192 - Low pressure sodium vapour lamps - EN 60192 2001
Performance specifications
1) 2)
IEC 60216-1 - Electrical insulating materials - EN 60216-1 2001
Properties of thermal endurance
Part 1: Ageing procedures and
evaluation of test results
1) 2)
IEC 60216-2 - Part 2: Choice of test criteria HD 611.2 S1 1992
1) 2)
IEC 60423 (mod) - Conduits for electrical purposes - EN 60423 1994
Outside diameters of conduits for
electrical installations and threads for
conduits and fittings
1) 2)
IEC 60529 - Degrees of protection provided by EN 60529 1991
enclosures (IP Code)
1) 2)
IEC 60622 - Secondary cells and batteries EN 60622 2003
containing alkaline or other non-acid
electrolytes - Sealed nickel-cadmium
prismatic rechargeable single cells
1) 2)
IEC 60623 - Secondary cells and batteries EN 60623 2001
containing alkaline or other non-acid
electrolytes - Vented nickel-cadmium
prismatic rechargeable single cells
1) 2)
IEC 60662 - High-pressure sodium vapour lamps EN 60662 1993
1) 2)
IEC 60947-1 - Low-voltage switchgear and controlgear EN 60947-1 1999
(mod) Part 1: General rules
1) 2)
IEC 61056-1 - General purpose lead-acid batteries EN 61056-1 2003
(valve regulated types)
Part 1: General requirements, functional
characteristics - Methods of test
1) 2)
IEC 61150 - Alkaline secondary cells and batteries - EN 61150 1993
Sealed nickel-cadmium rechargeable
monobloc batteries in button cell design
1) 2)
IEC 61436 - Secondary cells and batteries EN 61436 1998
containing alkaline or other non-acid
electrolytes - Sealed nickel-metal
hydride rechargeable single cells
1) 2)
IEC 61951-1 - Secondary cells and batteries EN 61951-1 2003
containing alkaline or other non-acid
electrolytes - Portable sealed
rechargeable single cells
Part 1: Nickel-cadmium
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- 5 - EN 60079-0:2004
Publication Year Title EN/HD Year
1) 2)
IEC 62013-1 - Caplights for use in mines susceptible EN 62013-1 2002
(mod) to firedamp
Part 1: General requirements -
Construction and testing in relation to
the risk of explosion
1)
IEC 62086-1 - Electrical apparatus for explosive gas - -
atmospheres - Electrical resistance
trace heating - Part 1: General and
testing requirements
1)
ISO 48 - Rubber, vulcanized or thermoplastic - -
Determination of hardness (hardness
between 10 IRHD and 100 IRHD)
1) 2)
ISO 178 - Plastics - Determination of flexural EN ISO 178 1996
properties
1) 2)
ISO 179 - Plastics - Determination of Charpy EN ISO 179 1996
impact strength
1)
ISO 262 - ISO general-purpose metric screw -
threads
Selected sizes for screws, bolts and
nuts
1) 2)
ISO 273 - Fasteners - Clearance holes for bolts EN 20273 1991
and screws
1) 2)
ISO 286-2 - ISO system of limits and fits EN 20286 1993
Part 2: Tables of standard tolerance
grades and limit deviations for holes
and shafts
1) 2)
ISO 527-2 - Plastics - Determination of tensile EN ISO 527-2 1996
properties
Part 2: Test conditions for moulding and
extrusion plastics
1)
ISO 965-1 - ISO general-purpose metric screw - -
threads - Tolerances
Part 1: Principles and basic data
1)
ISO 965-3 - ISO general purpose metric screw - -
threads - Tolerances - Part 3:
Deviations for constructional threads
1)
ISO 1817 - Rubber, vulcanized - Determination of - -
the effect of liquids
1) 2)
ISO 4014 - Hexagon head bolts - Product grades A EN ISO 4014 2000
and B
1) 2)
ISO 4017 - Hexagon head screws - Product grades EN ISO 4017 2000
A and B
1) 2)
ISO 4026 - Hexagon socket set screws with flat EN ISO 4026 2003
point
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EN 60079-0:2004 - 6 -
Publication Year Title EN/HD Year
1) 2)
ISO 4027 - Hexagon socket set screws with cone EN ISO 4027 2003
point
1) 2)
ISO 4028 - Hexagon socket set screws with dog EN ISO 4028 2003
point
1) 2)
ISO 4029 - Hexagon socket set screws with cup EN ISO 4029 2003
point
1) 2)
ISO 4032 - Hexagon nuts, style 1 - Product grades EN ISO 4032 2000
A and B
1) 2)
ISO 4762 - Hexagon socket head cap screws - EN ISO 4762 1997
Product grade A
1) 2)
ISO 4892-1 - Plastics - Methods of exposure to EN ISO 4892-1 2000
laboratory light sources
Part 1: General guidance
1)
ANSI/UL 746B - Polymeric Materials - Long-Term - -
Property Evaluations
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INTERNATIONAL IEC
STANDARD 60079-0
Fourth edition
2004-01
Electrical apparatus for explosive
gas atmospheres –
Part 0:
General requirements
© IEC 2004 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.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale XB
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue
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60079-0 IEC:2004 – 3 –
CONTENTS
FOREWORD.11
INTRODUCTION.17
1 Scope.19
2 Normative references.21
3 Terms and definitions .27
4 Apparatus grouping and temperature classification.39
4.1 Apparatus grouping.39
4.2 Group II.39
5 Temperatures.39
5.1 Environmental influences.39
5.2 Service temperature.41
5.3 Maximum surface temperature.41
5.4 Surface temperature and ignition temperature .43
5.5 Small components.43
6 Requirements for all electrical apparatus.45
6.1 General.45
6.2 Mechanical strength of apparatus.45
6.3 Opening times.45
6.4 Circulating currents.47
6.5 Gasket retention.47
7 Non-metallic enclosures and non-metallic parts of enclosures .47
7.1 General.47
7.2 Thermal endurance.49
7.3 Electrostatic charges on external non-metallic materials of enclosures.49
7.4 Threaded holes.51
8 Enclosures containing light metals.53
8.1 Material composition.53
8.2 Threaded holes.53
Fasteners .53
9.1 General.53
9.2 Special fasteners.55
9.3 Holes for special fasteners .55
10 Interlocking devices.59
11 Bushings.59
12 Materials used for cementing.59
13 Ex components.59
13.1 General.59
13.2 Mounting internal to apparatus .59
13.3 Mounting external to apparatus .61
14 Connection facilities and terminal compartments .61
14.1 General.61
14.2 Connection space.61
14.3 Type of protection.61
14.4 Creepage and clearance.61
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60079-0 IEC:2004 – 5 –
15 Connection facilities for earthing or bonding conductors .61
15.1 Internal.61
15.2 External.61
15.3 Apparatus not requiring earthing .63
15.4 Size of conductor connection.63
15.5 Protection against corrosion.63
15.6 Secureness.63
16 Entries into enclosures .65
16.1 General.65
16.2 Identification of entries.65
16.3 Cable glands.65
16.4 Blanking elements.65
16.5 Conductor temperature.65
17 Supplementary requirements for rotating electrical machines .67
17.1 Fans and fan hoods.67
17.2 Ventilation openings for external fans.67
17.3 Construction and mounting of the ventilating systems .69
17.4 Clearances for the ventilating system .69
17.5 Materials for external fans and fan hoods .69
17.6 Equipotential bonding conductors.69
18 Supplementary requirements for switchgear .69
18.1 Flammable dielectric.69
18.2 Disconnectors.71
18.3 Group I – Provisions for locking.71
18.4 Doors and covers.71
19 Supplementary requirements for fuses .73
20 Supplementary requirements for plugs and sockets .73
20.1 Interlocking.73
20.2 Energized plugs.73
21 Supplementary requirements for luminaires .73
21.1 General.73
21.2 Covers.75
21.3 Special lamps.75
22 Supplementary requirements for caplights and handlights .75
22.1 Group I caplights and handlights .75
22.2 Group II caplights and handlights .75
23 Apparatus incorporating cells and batteries .77
23.1 Batteries.77
23.2 Cell types.77
23.3 Cells in a battery .79
23.4 Ratings of batteries .79
23.5 Mixture of cells.79
23.6 Interchangeability.79
23.7 Charging of primary batteries .79
23.8 Leakage.79
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60079-0 IEC:2004 – 7 –
23.9 Connections.81
23.10 Orientation.81
23.11 Replacement of cells or batteries.81
24 Documentation.81
25 Compliance of prototype or sample with documents .81
26 Type tests.81
26.1 General.81
26.2 Test configuration.81
26.3 Tests in explosive test mixtures .81
26.4 Tests of enclosures.83
26.5 Thermal tests.91
26.6 Torque test for bushings .93
26.7 Non-metallic enclosures or non-metallic parts of enclosures .95
26.8 Thermal endurance to heat .95
26.9 Thermal endurance to cold .97
26.10 Resistance to light .97
26.11 Resistance to chemical agents for Group I electrical apparatus .99
26.12 Earth continuity.99
26.13 Surface resistance test of parts of enclosures of non-metallic materials.101
26.14 Charging tests.103
26.15 Measurement of capacitance .111
27 Routine verifications and tests.111
28 Manufacturer's responsibility.111
28.1 Certificate.111
28.2 Responsibility for marking.111
29 Marking.111
29.1 Location.113
29.2 General.113
29.3 Different types of protection.115
29.4 Order of marking.117
29.5 Ex components.117
29.6 Small apparatus and Ex components .117
29.7 Extremely small apparatus and Ex components .117
29.8 Warning markings.117
29.9 Cells and batteries.119
29.10 Examples of marking.119
30 Instructions.121
30.1 General.121
30.2 Cells and batteries.123
Annex A (normative) Ex cable glands.125
Annex B (normative) Requirements for Ex components.139
Annex C (informative) Example of rig for resistance to impact test.143
Bibliography.145
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60079-0 IEC:2004 – 9 –
Figure 1 – Tolerances and clearance for threaded fasteners .57
Figure 2 – Contact surface under head of fastener with a reduced shank.57
Figure 3 – Illustration of entry points and branching points .67
Figure 4 – Assembly of test sample for earth-continuity test.101
Figure 5 – Test piece with painted electrodes .103
Figure 6 – Rubbing with a pure nylon cloth .107
Figure 7 – Discharging of a container with a probe connected to earth via a 0,1 μF
capacitor.109
Figure 8 – Charging by influence with a d.c. voltage power supply.109
Figure A.1 – Illustration of the terms used for cable glands .125
Figure A.2 – Rounded edge of the point of entry of the flexible cable .129
Figure C.1 – Example of rig for resistance to impact test .143
Table 1 – Ambient temperatures in service and additional marking .41
Table 2 – Classification of maximum surface temperatures for Group II electrical
apparatus .43
Table 3 – Assessment for T4 classification according to component size and ambient
temperature .43
Table 4 – Limitations of areas .51
Table 5 – Minimum cross-sectional area of protective conductors .63
Table 6 – Primary cells .
...
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