SIST EN 60079-31:2010

Explosive atmospheres -- Part 31: Equipment dust ignition protection by enclosure t

This part of IEC 60079 is applicable to electrical equipment protected by enclosure and surface temperature limitation for use in explosive dust atmospheres. It specifies requirements for design, construction and testing of electrical equipment. 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 shall take precedence. This standard does not apply to dusts of explosives, which do not require atmospheric oxygen for combustion, or to pyrophoric substances. This standard does not apply to electrical equipment intended for use in underground parts of mines as well as those parts of surface installations of such mines endangered by firedamp and/or combustible dust. This standard does not take account of any risk due to an emission of flammable or toxic gas from the dust.

Explosionsfähige Atmosphäre -- Teil 31: Geräte - Staubexplosionsschutz durch Gehäuse t

Atmosphères explosives -- Partie 31: Protection du matériel contre l'inflammation des poussières par enveloppe t

La CEI 60079-31:2008 est applicable au matériel électrique protégé par enveloppe et limitation de la température de surface, pour une utilisation en atmosphère de poussière explosive. Elle spécifie les exigences de conception, de construction et d'essai pour le matériel électrique. La présente norme complète et modifie les exigences générales de la CEI 60079-0. Lorsqu'une exigence de la présente norme est en conflit avec une exigence de la CEI 60079-0, l'exigence de la présente norme prévaut. Cette première édition de la CEI 60079-31 est issue de la première édition de la CEI 61241-1 (2004) qu'elle annule et remplace. Les modifications importantes par rapport à l'édition précédente sont:  - Titre modifié pour Protection du matériel contre l'inflammation de poussières par enveloppe 't'  - Regroupement et rationalisation des méthodes A et B en une seule méthode, et de certaines exigences de constructions qui n'étaient appliquées qu'à une seule méthode et qui maintenant sont applicables à toutes les enveloppes  - Introduction des trois niveaux de protection, 'ta', 'tb' et 'tc'  - Les gammes de tensions d'essai et les conditions de surcharge pour les essais thermiques ont été définies  - Introduction d'un essai de pression avant l'essai IP  - Réduction des niveaux de puissance et de tension pour le niveau de protection 'ta'  - Introduction d'une variante de l'essai IP6X pour le niveau de protection 'ta'  - Essai thermique de couche de poussière obligatoire pour le niveau de protection 'ta' par enfouissement de l'enveloppe dans de la poussière dont la couche a une épaisseur d'au moins 500 mm sur toutes les surfaces accessibles. Le contenu du corrigendum de mars 2009 a été pris en considération dans cet exemplaire.

Eksplozivne atmosfere - 31. del: Zaščita opreme pred vžigom gorljivega prahu z ohišjem "t" (IEC 60079-31:2008 + corrigendum Mar. 2009)

Ta del IEC 60079 velja za električno opremo, zaščiteno z ohišjem, in za omejevanje temperature površine za uporabo v eksplozivnih prašnih atmosferah. Določa zahteve za načrtovanje, izgradnjo in preskušanje električne opreme. Ta standard dopolnjuje in spreminja splošne zahteve IEC 60079-0. Kjer zahteva tega standarda nasprotuje zahtevi IEC 60079-0, ima zahteva tega standarda prednost. Ta standard ne velja za prah eksplozivov, ki ne potrebuje atmosferskega kisika za zgorevanje ali za piroforne snovi.  Ta standard ne velja za električno opremo, namenjeno uporabi v podzemnih delih rudnikov, in za tiste dele površinskih naprav teh rudnikov, ki jih ogroža jamski plin in/ali gorljiv prah. Ta standard ne upošteva kakršnega koli tveganje zaradi emisije gorljivih ali strupenih plinov iz prahu.

General Information

• Status: Withdrawn
• Publication Date: 15-Feb-2010
• Withdrawal Date: 09-Oct-2016
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: EXP - Electrical apparatus for explosive atmospheres
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 06-Oct-2016
• Due Date: 29-Oct-2016
• Completion Date: 10-Oct-2016
• Directive: 94/9/EC - Directive 94/9/EC of the European Parliament and the Council of 23 March 1994 on the approximation of the laws of the Member States concerning equipment and protective systems intended for use in potentially explosive atmospheres
• Ref Project: EN 60079-31:2009 - Explosive atmospheres - Part 31: Equipment dust ignition protection by enclosure "t"

Relations

• Replaced By: SIST EN 60079-31:2014 - Explosive atmospheres - Part 31: Equipment dust ignition protection by enclosure "t" (IEC 60079-31:2013)
• Effective Date: 28-Jan-2023
• Revised: SIST EN 61241-1:2005 - Electrical apparatus for use in the presence of combustible dust -- Part 1: Protection by enclosures tD
• Effective Date: 08-Oct-2012
• Replaces: SIST EN 61241-1:2005 - Electrical apparatus for use in the presence of combustible dust -- Part 1: Protection by enclosures tD
• Effective Date: 29-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60079-31:2010
01-marec-2010
(NVSOR]LYQHDWPRVIHUHGHO=DãþLWDRSUHPHSUHGYåLJRPJRUOMLYHJDSUDKX]
RKLãMHPW,(&FRUULJHQGXP0DU
Explosive atmospheres -- Part 31: Equipment dust ignition protection by enclosure t
Explosionsfähige Atmosphäre -- Teil 31: Geräte - Staubexplosionsschutz durch Gehäuse
t
Atmosphères explosives -- Partie 31: Protection du matériel contre l'inflammation des
poussières par enveloppe t
Ta slovenski standard je istoveten z: EN 60079-31:2009
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
SIST EN 60079-31:2010 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60079-31:2010

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SIST EN 60079-31:2010

EUROPEAN STANDARD
EN 60079-31

NORME EUROPÉENNE
December 2009
EUROPÄISCHE NORM

ICS 29.260.20 Supersedes EN 61241-1:2004 + corr. Dec. 2006


English version


Explosive atmospheres -
Part 31: Equipment dust ignition protection by enclosure "t"
(IEC 60079-31:2008 + corrigendum 2009)


Atmosphères explosives -  Explosionsfähige Atmosphäre -
Partie 31: Protection du matériel Teil 31: Geräte-Staubexplosionsschutz
contre l'inflammation des poussières durch Gehäuse "t"
par enveloppe "t" (IEC 60079-31:2008 + Corrigendum 2009)
(CEI 60079-31:2008 + corrigendum 2009)




This European Standard was approved by CENELEC on 2009-10-01. 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: Avenue Marnix 17, B - 1000 Brussels


© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-31:2009 E

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SIST EN 60079-31:2010
EN 60079-31:2009 - 2 -
Foreword
The text of document 31/765/FDIS, future edition 1 of IEC 60079-31, prepared by IEC TC 31, Equipment
for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60079-31 on 2009-10-01.
This European Standard supersedes EN 61241-1:2004 + corrigendum December 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) 2010-07-01
– latest date by which the national standards conflicting
(dow) 2012-10-01
with the EN have to be withdrawn
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directive 94/9/EC. See Annex ZZ.
CENELEC/TC 31 as the responsible committee has concluded that this edition of EN 60079-31 does not
contain substantial changes regarding the ESRs.
The State of the Art is included in Annex ZY “Significant changes between this European Standard and
EN 61241-1:2004".
Annexes ZA, ZY and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60079-31:2008 + corrigendum March 2009 was approved by
CENELEC as a European Standard without any modification.
__________

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SIST EN 60079-31:2010
- 3 - EN 60079-31:2009
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 60034-1 - Rotating electrical machines - EN 60034-1 2004
Part 1: Rating and performance


1) 2)
IEC 60079-0 - Explosive atmospheres - EN 60079-0 2009
Part 0: Equipment - General requirements


1) 2)
IEC 60079-7 - Explosive atmospheres - EN 60079-7 2007
Part 7: Equipment protection by increased
safety "e"


IEC 60127 Series Miniature fuses EN 60127 Series


1) 2)
IEC 60691 - Thermal-links - EN 60691 2003
Requirements and application guide


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)
Undated reference.
2)
Valid edition at date of issue.

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SIST EN 60079-31:2010
EN 60079-31:2009 - 4 -
Annex ZY
(informative)

Significant changes between this European Standard and EN 61241-1:2004
The significant changes with respect to EN 61241-1:2004 are as listed below.
Type
Minor and Extension Substantial
editorial change
changes regarding
a
ESR´s
title changed to Equipment dust ignition protection by enclosure
X
"t"
combination and rationalisation of practice A and B into a single
practice, and some constructional requirements that may have X
applied to only one practice now apply to all enclosures
introduction of three levels of protection, “ta”, “tb” and “tc” X
defined test voltage ranges and overload conditions for thermal
X
tests
introduction of a pressure test prior to the IP test X
restrictions on power and voltage levels for level of protection
X
“ta”
introduction of a variant of the IP6X test for level of protection
X
“ta”
compulsory dust layer thermal test for protection level “ta” by
surrounding the enclosure with dust to a depth of at least 500 X
mm on all available surfaces
a
 ESR = Essential Health and Safety Requirements (Annex II of Directive 94/9/EC)

General conclusion on the change of the State of the Art by this standard
CENELEC/TC 31 as the responsible committee has concluded that this edition of EN 60079-31 does not
contain substantial changes regarding the ESRs.

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SIST EN 60079-31:2010
- 5 - EN 60079-31:2009
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 (partly), ER 1.0.4 (partly), ER 1.0.5 (partly)
– ER 1.2.4 (partly)
– ER 1.2.8 (partly)
– ER 1.3.1 (partly)
– ER 2.1.2
– ER 2.2.2
– ER 2.3.2
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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SIST EN 60079-31:2010

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SIST EN 60079-31:2010
IEC 60079-31
Edition 1.0 2008-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Explosive atmospheres –
Part 31: Equipment dust ignition protection by enclosure “t”

Atmosphères explosives –
Partie 31: Protection du matériel contre l’inflammation des poussières par
enveloppe «t»

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
L
CODE PRIX
ICS 29.260.20 ISBN 2-8318-1015-0
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 60079-31:2010
– 2 – 60079-31 © IEC:2008
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .5
3 Terms and definitions .6
4 Level of protection.6
4.1 General .6
4.2 Additional requirements for level of protection “ta”.6
4.2.1 Thermal protection .6
5 Construction .7
5.1 Joints .7
5.1.1 General .7
5.1.2 Gaskets and seals .7
5.1.3 Cemented joints .8
5.1.4 Operating rods, spindles and shafts.8
5.1.5 Windows.8
5.2 Cable glands and conduit entries.8
5.2.1 Cable glands .8
5.2.2 Conduit entries .8
6 Verification and tests .9
6.1 Type tests .9
6.1.1 Type tests for dust exclusion by enclosures.9
6.1.2 Thermal tests .9
6.1.3 Pressure test .10
6.2 Routine tests .10
7 Marking .10
Bibliography.11

Table 1 – Ingress protection .9
Table 2 – Conditions for the determination of maximum surface temperature.9

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SIST EN 60079-31:2010
60079-31 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
__________

EXPLOSIVE ATMOSPHERES –

Part 31: Equipment dust ignition protection by enclosure "t"


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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 60079-31 has been prepared by IEC technical committee 31:
Equipment for explosive atmospheres.
This first edition of IEC 60079-31 has been developed from the first edition of IEC 61241-1
(2004) which it now cancels and supersedes.
The significant changes with respect to the previous edition are listed below:
– Title changed to Equipment dust ignition protection by enclosure "t"
– Combination and rationalisation of practice A and B into a single practice, and some
constructional requirements that may have applied to only one practice now apply to all
enclosures
– Introduction of three levels of protection, “ta”, “tb” and “tc”
– Defined test voltage ranges and overload conditions for thermal tests.
– Introduction of a pressure test prior to the IP test
– Restrictions on power and voltage levels for level of protection “ta”

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SIST EN 60079-31:2010
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...