SIST EN 60079-5:2008
Explosive atmospheres -- Part 5: Equipment protection by powder filling q
Explosive atmospheres -- Part 5: Equipment protection by powder filling q
This part of IEC 60079 contains specific requirements for the construction, testing and marking of electrical equipment, parts of electrical equipment and Ex components in the type of protection powder filling "q", intended for use in explosive gas atmospheres. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard will take precedence. This standard applies to electrical equipment, parts of electrical equipment and Ex components with: - a rated supply current less than or equal to 16 A; - a rated supply voltage less than or equal to 1 000 V; - a rated power consumption less than or equal to 1 000 W.
Explosionsfähige Atmosphäre -- Teil 5: Geräteschutz durch Sandkapselung q
Atmosphères explosives -- Partie 5: Protection du matériel par remplissage pulvérulent q
contient les exigences spécifiques de construction, d'essais et de marquage du matériel électrique, des parties de matériel électrique et des composants Ex à remplissage pulvérulent, mode de protection 'q', destinés à être utilisés dans des atmosphères explosives gazeuses. Les modifications importantes par rapport à l'édition précédente sont: toutes les exigences relatives à la certification par une tierce partie ont été supprimées; des exigences ont été ajoutées pour les connexions externes; toutes les exigences pour les passages de câbles ont été retirées parce qu'elles ont été transférées dans la 60079-0; des exigences spécifiques ont été introduites pour les piles et accumulateurs; des exigences plus souples ont été ajoutées pour les pannes requises pour le matériel protégé par des éléments de coupure, et des exigences ont été ajoutées pour les instructions.
Eksplozivne atmosfere - 5. del: Zaščita opreme s polnjenjem s peskom "q" (IEC 60079-5:2007)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60079-5:2008
01-marec-2008
1DGRPHãþD
SIST EN 50017:2000
(NVSOR]LYQHDWPRVIHUHGHO =DãþLWDRSUHPHVSROQMHQMHPVSHVNRPT ,(&
Explosive atmospheres - Part 5: Equipment protection by powder filling "q"
Explosionsfähige Atmosphäre - Teil 5: Geräteschutz durch Sandkapselung "q"
Atmospheres explosives - Partie 5: Protection du matériel par remplissage pulvérulent
"q"
Ta slovenski standard je istoveten z: EN 60079-5:2007
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
SIST EN 60079-5:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
EN 60079-5
NORME EUROPÉENNE
November 2007
EUROPÄISCHE NORM
ICS 29.260.20 Supersedes EN 50017:1998
English version
Explosive atmospheres -
Part 5: Equipment protection by powder filling "q"
(IEC 60079-5:2007)
Atmosphères explosives - Explosionsfähige Atmosphäre -
Partie 5: Protection du matériel Teil 5: Geräteschutz durch
par remplissage pulvérulent "q" Sandkapselung "q"
(CEI 60079-5:2007) (IEC 60079-5:2007)
This European Standard was approved by CENELEC on 2007-11-01. 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, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the 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
© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-5:2007 E
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EN 60079-5:2007 - 2 -
Foreword
The text of document 31/675/FDIS, future edition 3 of IEC 60079-5, prepared by IEC TC 31, Equipment
for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60079-5 on 2007-11-01.
This European Standard supersedes EN 50017:1998.
This European Standard is to be read in conjunction with EN 60079-0:2006.
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) 2008-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-11-01
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. See Annex ZZ.
Annexes ZA and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60079-5:2007 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 60664-1 NOTE Harmonized as EN 60664-1:2007 (not modified).
IEC 60079 NOTE Harmonized in EN 60079 series (partly modified).
__________
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- 3 - EN 60079-5:200X
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
IEC 60079-0 2004 Electrical apparatus for explosive gas EN 60079-0 2006
(mod) atmospheres -
Part 0: General requirements
1) 2)
IEC 60079-1 – Explosive atmospheres - EN 60079-1 2007
Part 1: Equipment protection by flameproof
enclosures "d"
1) 2)
IEC 60079-7 – Explosive atmospheres - EN 60079-7 2007
Part 7: Equipment protection by increased
safety "e"
1) 2)
IEC 60079-11 – Explosive atmospheres - EN 60079-11 2007
Part 11: Equipment protection by intrinsic
safety "i"
1) 2)
IEC 60529 – Degrees of protection provided by EN 60529 1991
enclosures (IP Code) + corr. May 1993
1)
ISO 2591-1 – Test sieving - – –
Part 1: Methods using test sieves of woven
wire cloth and perforated metal plate
1)
ISO 3310-1 – Test sieves - Technical requirements and – –
testing -
Part 1: Test sieves of metal wire cloth
1)
ISO 3310-2 – Test sieves - Technical requirements and – –
testing -
Part 2: Test sieves of perforated plates
1)
Undated reference.
2)
Valid edition at date of issue.
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EN 60079-5:2007 - 4 -
Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers only the
following essential requirements out of those given in Annex II of the EC Directive 94/9/EC:
– ER 1.0.1, ER 1.0.2, ER 1.0.3, ER 1.0.5, ER 1.0.6;
– ER 1.1 (partly);
– ER 1.2.1 (partly), ER 1.2.2 (partly), ER 1.2.3, ER 1.2.8;
– ER 1.3.1;
– ER 1.5.3;
– ER 1.6.4;
– ER 2.0.2.1;
– ER 2.2.1.1, ER 2.2.1.2.
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directive concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling within
the scope of this standard.
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NORME CEI
INTERNATIONALE
IEC
60079-5
INTERNATIONAL
Troisième édition
STANDARD
Third edition
2007-03
Atmosphères explosives –
Partie 5:
Protection du matériel par remplissage
pulvérulent «q»
Explosive atmospheres –
Part 5:
Equipment protection by powder filling «q»
© IEC 2007 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. 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
CODE PRIX
S
PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue
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60079-5 © IEC:2007 – 3 –
CONTENTS
FOREWORD.5
1 Scope.9
2 Normative references .9
3 Terms and definitions .11
4 Constructional requirements .11
4.1 Enclosure .11
4.2 Filling material.13
4.3 Distances .15
4.4 Materials used for support of energized parts .17
4.5 External field-wiring connections .17
4.6 Capacitors.17
4.7 Cells and batteries .17
4.8 Temperature limitations .19
4.9 Temperature limitations under fault conditions.19
5 Verifications and tests .25
5.1 Type verifications and tests.25
5.2 Routine verifications and tests.27
6 Marking .29
7 Instructions.29
Annex A (informative) Introduction of an alternative risk assessment method
encompassing ‘equipment protection levels’ for Ex equipment .33
Bibliography.43
Figure 1 – Test arrangement for the dielectric strength test of the filling material .31
Table 1 – Distances through the filling material.15
Table 2 – Creepage distances and distances through filling material .23
Table A.1 – Traditional relationship of EPLs to zones (no additional risk assessment) .37
Table A.2 – Description of risk of ignition protection provided .39
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60079-5 © IEC:2007 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
EXPLOSIVE ATMOSPHERES –
Part 5: Equipment protection by powder filling “q”
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,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). 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. 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 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 IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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 (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 60079-5 has been prepared by IEC technical committee 31:
Equipment for explosive atmospheres.
This third edition cancels and replaces the second edition, published in 1997, and its
amendment (2003), and constitutes a technical revision.
This part is to be used in conjunction with IEC 60079-0:2004, Electrical apparatus for
explosive gas atmospheres – Part 0: General requirements.
The significant changes with respect to the previous edition are listed below:
– all requirements for third-party certification removed;
– requirements for external connections added ;
– all requirements for cable glands deleted as they have been transferred to 60079-0;
– specific requirements for cells and batteries introduced ;
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60079-5 © IEC:2007 – 7 –
– added relaxation requirements on required faults for fuse-protected equipment;
– added requirements for instructions.
The text of this standard is based on the following documents:
FDIS Report on voting
31/675/FDIS 31/689/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.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60079 series, under the general title Explosive atmospheres, 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 a new 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.
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60079-5 © IEC:2007 – 9 –
EXPLOSIVE ATMOSPHERES –
Part 5: Equipment protection by powder filling “q”
1 Scope
This part of IEC 60079 contains specific requirements for the construction, testing and
marking of electrical equipment, parts of electrical equipment and Ex components in the type
of protection powder filling “q”, intended for use in explosive gas atmospheres.
NOTE 1 Electrical equipment and Ex components protected by powder filling “q” may contain electronic circuits,
transformers, protection fuses, relays, intrinsically safe electrical apparatus, associated electrical apparatus,
switches, etc.
NOTE 2 Type of protection powder filling “q” provides equipment protection level (EPL) Gb. For further
information, see Annex A.
This standard supplements and modifies the general requirements of IEC 60079-0. Where a
requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of
this standard will take precedence.
This standard applies to electrical equipment, parts of electrical equipment and Ex
components with:
– a rated supply current less than or equal to 16 A;
– a rated supply voltage less than or equal to 1 000 V;
– a rated power consumption less than or equal to 1 000 W.
2 Normative references
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.
IEC 60079-0:2004, Electrical apparatus for explosive gas atmospheres – Part 0: General
requirements
IEC 60079-1, Electrical apparatus for explosive gas atmospheres – Part 1: Flameproof
enclosure “d”
IEC 60079-7, Explosive atmospheres – Part 7: Equipment protection by increased safety "e"
IEC 60079-11, Explosive atmospheres – Part 11: Equipment protection by intrinsic safety "i"
IEC 60529, Degrees of protection provided by enclosures (IP Code)
ISO 3310-1, Test sieves – Technical requirements and testing – Part 1: Test sieves of metal
wire cloth
ISO 3310-2, Test sieves – Technical requirements and testing – Part 2: Test sieves of
perforated plates
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60079-5 © IEC:2007 – 11 –
ISO 2591-1, Test sieving – Methods using test sieves of woven wire cloth and perforated
metal plate
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply; they supplement
the terms and definitions given in IEC 60079-0.
NOTE Additional definitions applicable to explosive atmospheres can be found in IEC 60050-426.
3.1
powder filling “q”
type of protection in which the parts capable of igniting an explosive gas atmosphere are fixed
in position and completely surrounded by filling material to prevent the ignition of an external
explosive gas atmosphere
NOTE The type of protection may not prevent the surrounding explosive gas atmosphere from penetrating into the
equipment and components and being ignited by the circuits. However, due to the small free volumes in the filling
material and due to the quenching of a flame which may propagate through the paths in the filling material, an
external explosion is prevented.
3.2
filling material
solid quartz or solid glass particles
3.3
distance through filling material
shortest distance through a filling material between two conductive parts
4 Constructional requirements
4.1 Enclosure
In addition to the enclosure requirements of IEC 60079-0, the following requirements apply.
4.1.1 Closing and sealing
Enclosures of electrical equipment, parts of electrical equipment or Ex components protected
by powder filling ”q” shall be filled and sealed at the time of manufacture. The closing and
sealing shall be the methods of 4.1.1.1 or 4.1.1.2.
4.1.1.1 Enclosures permanently sealed at the time of manufacture
The enclosure shall be permanently sealed at the time of manufacture and shall not be
capable of being opened without leaving visible evidence that the enclosure has been
opened. The enclosure shall be marked in accordance with 6 a).
4.1.1.2 Enclosures intended to be opened for repair
Electrical equipment, parts of electrical equipment, or Ex components that are designed to be
repaired shall incorporate sealing methods that are capable of being renewed without damage
to the enclosure when the equipment is repaired, re-filled, and re-sealed. The enclosure shall
be marked in accordance with 6 b).
NOTE Suitable techniques that may provide visible evidence of being opened are, for example, welding,
soldering, cemented joints, rivets, cementing of screws, or lead-seal safety-wiring of screws.
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60079-5 © IEC:2007 – 13 –
4.1.2 Pressure test of enclosure
The electrical equipment, parts of electrical equipment or Ex components protected by powder
filling “q” shall meet the pressure test requirements specified in 5.1.1.
4.1.3 Degree of protection of the enclosure
The enclosure of the electrical equipment, parts of electrical equipment, or Ex components
protected by powder filling “q”, in its normal service condition, i.e. with all openings closed as
in normal use, shall comply at least with the degree of protection IP54 as defined in
IEC 60529. If the degree of protection is IP55 or higher, the enclosure shall be provided with
a breathing device. The enclosure with the breathing device in place shall comply at least with
the degree of protection IP54 according to IEC 60529. The test shall be conducted on an
empty enclosure without the powder filling installed. At the end of any water ingress tests, no
water shall be visible inside the enclosure.
NOTE 1 It is acknowledged that the enclosure may need to be destroyed in order to determine the entrance of
dust or water. Two separate test samples may be required.
The ingress protection of enclosures or parts of electrical equipment protected by powder
filling “q”, intended for use only in clean, dry rooms, may be reduced to degree of protection
IP43. These enclosures shall be marked with the symbol "X" in accordance with 29.2 i) of
IEC 60079-0 and the specific conditions for use shall detail the restrictions of use.
When Ex components protected by powder filling “q” are intended to be mounted inside
another enclosure complying with IEC 60079-0, this outer enclosure shall have a degree of
protection of at least IP54. The IP of the inner enclosure does not need to be specified
provided that the Ex component is mounted in a position where it is unlikely to be
contaminated by any small amounts of water that may enter the outer enclosure.
The maximum gap of an enclosure protected by powder filling “q” shall be at least 0,1 mm
smaller than the specified smallest dimension of the filling material.
NOTE 2 The restriction on the size of the gap is intended to reduce the escape of filling material.
4.1.4 Filling procedure
Filling shall be carried out so as not to leave any void within the filling material (for example
by shaking down). The free space within electrical equipment, parts of electrical equipment or
Ex components protected by powder filling “q” shall be effectively filled with filling material
(see also 4.3.2).
4.2 Filling material
4.2.1 Requirements
The material shall be tested dry in accordance with ISO 2591-1, using a 1 mm nominal
aperture sieve in accordance with ISO 3310-1 or ISO 3310-2 and a 500 μm nominal aperture
sieve in accordance with ISO 3310-1.
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60079-5 © IEC:2007 – 15 –
4.2.2 Documentation
The documents prepared by the manufacturer in accordance with IEC 60079-0 shall include
the specification of the particle material, the size range of the particles, as well as the filling
process and the measures taken to ensure proper filling.
NOTE It is not a requirement of this standard that conformity to the specification of the particle material and size
range of the particles needs to be verified.
4.2.3 Testing
The filling material shall be subjected to the dielectric strength test specified in 5.1.4.
4.3 Distances
4.3.1 Distances through filling material
Except where specified otherwise in this standard, the minimum distance through the filling
material between electrically conducting parts of the equipment and the inner surface of the
enclosure shall comply with Table 1. This does not apply to conductors used for external
connections which penetrate the wall of the enclosure. Such conductors shall comply with any
requirements for the type of protection employed for the external connections.
Table 1 – Distances through the filling material
Voltage a.c. r.m.s. or d.c. Minimum distance
V mm
U ≤250 5
400 6,3
500 8
800 10
1 000 14
1 600 16
2 500 25
3 200 32
4 000 40
5 000 50
6 300 63
8 000 80
10 000 100
NOTE Voltages shown are derived from IEC 60664-1 and are based on the
rationalization of supply voltages given in Table 3b. When determining the required
values for distance, the voltage value in the table may be increased by a factor of
1.1 in order to recognize the range of rated voltages in common use.
Fault conditions according to 4.9 shall be considered when determining the working voltage.
NOTE While this standard is applicable to equipment with a rated supply voltage not exceeding 1 000 V, Table 1
takes into account working voltages greater than 1 000 V which may be developed or generated within the
equipment or Ex component. A typical example is a fluorescent luminaire ballast with a rated voltage of 240 V, but
with an arc initiation voltage of approximately 2 000 V.
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60079-5 © IEC:2007 – 17 –
4.3.2 Distances surrounding free space
If electrical equipment contains components which have an enclosed free space not filled with
the filling material (e.g. a relay), the following requirements apply:
3
– if the enclosed free space of the component is less than 3 cm , the minimum distance
through filling material between the component wall and the inner surface of the enclosure
shall comply with Table 1;
3 3
– if the enclosed free space of the component is between 3 cm and 30 cm , the minimum
distance through filling material between the component wall and the inner surface of the
enclosure shall comply with Table 1 but with a minimum of 15 mm;
– the component shall be fixed, so that movement nearer to the wall of the enclosure is not
possible;
3
– free volumes of more than 30 cm are not permitted;
– the enclosure of the component shall resist the thermal and mechanical stresses to which
it will be subjected even under fault conditions according to 4.9. There shall be no damage
or distortion which could reduce the protection provided by the filling material.
4.4 Materials used for support of energized parts
Materials used between the electrically energized parts and the wall of the enclosure (except
for the insulation of external wiring and the filling material) in the region specified in 4.3 shall
comply with the flammability requirements specified in 5.1.3.
4.5 External field-wiring connections
Terminations or cables used for the entry of electrical conductors into a powder filled “q”
enclosure shall be an integral part of the enclosure and shall be protected and sealed as
specified in 4.1.1. When a cable provides the entry of conductors into a powder filled “q”
equipment or Ex component, the clamping means shall comply with the cable gland
requirements of IEC 60079-0 and shall not be capable of being removed without obvious
damage to the powder filled “q” enclosure.
4.6 Capacitors
The total stored energy of all capacitors in an enclosure of electrical equipment, part of
electrical equipment or Ex component protected by powder filling “q” shall not exceed 20 J in
normal operation.
4.7 Cells and batteries
Enclosures for powder filled “q” electrical equipment, parts of electrical equipment or Ex
components that contain cells or batteries shall incorporate a breathing device to the
surrounding atmosphere (see 4.1.3) unless the batteries or cells:
a) have a capacity of 1,5 Ah or less, or
b) do not release gas under normal operating conditions, and comply with the requirements
for primary and secondary batteries with capacity up to 25 Ah, in IEC 60079-7.
NOTE 1 Sealed gas-tight cells do not release gas under normal operating conditions.
NOTE 2 Consideration shall be given to the effect that a release from the breather may have on the surrounding
atmosphere.
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60079-5 © IEC:2007 – 19 –
4.8 Temperature limitations
Each electrical equipment, part of electrical equipment or Ex component protected by powder
filling “q” shall be protected against overload prescribed in the relevant product standard
specified by the manufacturer so that the permissible limit temperature of the applicable
temperature class is not exceeded at the wall of the
...
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