EN IEC 60079-31:2024
(Main)Explosive atmospheres - Part 31: Equipment dust ignition protection by enclosure "t"
Explosive atmospheres - Part 31: Equipment dust ignition protection by enclosure "t"
IEC 60079-31:2022 is available as IEC 60079-31:2022 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60079-31:2022 is applicable to equipment protected by enclosure and surface temperature limitation for use in explosive dust atmospheres. It specifies requirements for design, construction and testing of Ex Equipment and Ex Components. This document supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this document conflicts with a requirement of IEC 60079-0, the requirement of this document takes precedence. This document does not apply to dusts of explosives, which do not require atmospheric oxygen for combustion, or to pyrophoric substances. This document does not apply to Ex Equipment or Ex Components 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 document does not take account of any risk due to an emission of flammable or toxic gas from the dust. This third edition cancels and replaces the second edition published in 2013. This edition constitutes a technical revision. Main significant changes from the previous edition are: 1) Document has been restructured from edition 2 2) Fault current rating of interrupting contacts in clauses 4.3.1 and 4.4.1, major change type C1 3) Cells and batteries in clauses 4.3.5.1 and 4.4.5.1, major change type C2 4) Overload or malfunction condition for the determination of temperature class for "tb" converter fed rotating electric machines, major change type C3 5) Additional requirements for entry devices with dust ignition protection by enclosure "t", major change type C4 Information about the background of ‘Major Technical Changes’ C1 – Ex Equipment having Level of Protection "ta" shall be rated for connection to a circuit with a prospective short circuit current of not greater than 1.5 kA. For Ex Equipment having Level of Protection "tb" or "tc" which is intended for mains connection and intended to interrupt fault current above 10kA, the equipment shall have a rated maximum short circuit withstand current, be tested according to 6.1.1.1, and be marked according to Clause 7. C2 – For Ex Equipment having Level of Protection "ta" which contains a cell or battery, only a sealed cell or battery shall be used. For Ex Equipment having Level of Protection "tb" and "tc" where there are sparking contacts or hot surfaces, and which contains a cell or battery, only a sealed cell or battery shall be used. C3 – Table 2 now includes malfunction conditions for temperature class determination of Level of Protection "tb" converter-fed electric machines. C4 – Annex A added for entry devices with Type of Protection "t" including cable transit devices.
Explosionsgefährdete Bereiche - Teil 31: Geräte-Staubexplosionsschutz durch Gehäuse „t“
Atmosphères explosives - Partie 31: Protection contre l’inflammation de poussières par enveloppe "t" relative à l’appareil
IEC 60079-31:2022 est disponible sous forme de IEC 60079-31:2022 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60079-31:2022 est applicable à l’appareil 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 l’Appareil Ex et les Composants Ex. Le présent document complète et modifie les exigences générales de l’IEC 60079-0. Lorsqu'une exigence du présent document est en contradiction avec une exigence de l’IEC 60079-0, l’exigence du présent document prévaut. Le présent document ne s’applique pas aux poussières d’explosifs dont la combustion n’exige pas l’oxygène de l’air, ni aux substances pyrotechniques. Le présent document ne s’applique ni à l’Appareil Ex ni aux Composants Ex destinés à une utilisation dans les parties souterraines des mines, ni aux parties des installations de surface des mines où il existe des risques de grisou et/ou de poussières combustibles. Le présent document ne prend en compte aucun risque résultant d’une émission de gaz inflammable ou toxique provenant de la poussière.
Eksplozivne atmosfere - 31. del: Zaščita opreme pred vžigom gorljivega prahu z ohišjem "t" (IEC 60079-31:2022 + COR1:2023)
Ta del standarda IEC 60079 se uporablja za opremo, zaščiteno z ohišjem in omejitvijo površinske temperature za uporabo v eksplozivnih prašnih atmosferah. Določa zahteve za načrtovanje, izdelavo in preskušanje opreme ter sestavnih delov s protieksplozijsko zaščito.
Ta dokument dopolnjuje in spreminja splošne zahteve standarda IEC 60079-0. Kadar je zahteva iz tega dokumenta v nasprotju z zahtevo iz standarda IEC 60079-0, ima prednost zahteva iz tega dokumenta.
Ta dokument se ne uporablja za prah eksplozivov, ki za zgorevanje ne potrebujejo atmosferskega kisika, ali za piroforne snovi.
Ta dokument se ne uporablja za opremo ali sestavne dele s protieksplozijsko zaščito, ki so namenjeni uporabi v podzemnih delih rudnikov in delih površinskih instalacij takih rudnikov, ki jih ogroža jamski eksplozivni plin in/ali vnetljiv prah.
Ta dokument ne obravnava nobene nevarnosti zaradi emisije vnetljivega ali strupenega plina iz prahu.
Ta dokument ne vključuje zahtev za opremo s protieksplozijsko zaščito, ki se uporablja v območjih z atmosfero, ki lahko vsebuje vnetljiv prah in eksplozivni plin (hkrati ali ločeno). Zahteve za atmosfere z vnetljivim plinom je mogoče najti v drugih delih skupine standardov IEC 60079. Smernice glede opreme s protieksplozijsko zaščito, ki jo je treba uporabljati v atmosferah, v katerih sta sočasno prisotna vnetljiv prah in eksplozivni plin (»hibridne mešanice«), je mogoče najti v standardu IEC 60079-14.
Če mora oprema s protieksplozijsko zaščito izpolnjevati druge okoljske pogoje, na primer zaščito pred vdorom vode in odpornost proti koroziji, so morda potrebni dodatni ukrepi, ki ne vplivajo negativno na celovitost ohišja.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2024
Eksplozivne atmosfere - 31. del: Zaščita opreme pred vžigom gorljivega prahu z
ohišjem "t" (IEC 60079-31:2022 + COR1:2023)
Explosive atmospheres - Part 31: Equipment dust ignition protection by enclosure "t"
(IEC 60079-31:2022 + COR1:2023)
Explosionsgefährdete Bereiche - Teil 31: Geräte-Staubexplosionsschutz durch Gehäuse
"t" (IEC 60079-31:2022 + COR1:2023)
Atmosphères explosives - Partie 31: Protection contre l’inflammation de poussières par
enveloppe “t” relative au matériel (IEC 60079-31:2022 + COR1:2023)
Ta slovenski standard je istoveten z: EN IEC 60079-31:2024
ICS:
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60079-31
NORME EUROPÉENNE
EUROPÄISCHE NORM March 2024
ICS 29.260.20 Supersedes EN 60079-31:2014
English Version
Explosive atmospheres - Part 31: Equipment dust ignition
protection by enclosure "t"
(IEC 60079-31:2022 + COR1:2023)
Atmosphères explosives - Partie 31: Protection contre Explosionsgefährdete Bereiche - Teil 31: Geräte-
l'inflammation de poussières par enveloppe "t" relative à Staubexplosionsschutz durch Gehäuse "t"
l'appareil (IEC 60079-31:2022 + COR1:2023)
(IEC 60079-31:2022 + COR1:2023)
This European Standard was approved by CENELEC on 2023-12-13. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60079-31:2024 E
European foreword
The text of document 31/1595/FDIS, future edition 3 of IEC 60079-31+COR1, prepared by IEC/TC 31
"Equipment for explosive atmospheres" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 60079-31:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2024-09-13
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-12-13
document have to be withdrawn
This document supersedes EN 60079-31:2014 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60079-31:2022+COR1:2023 was approved by CENELEC
as a European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60079-14 NOTE Approved as EN 60079-14
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60079-0 - Explosive atmospheres - Part 0: Equipment - EN IEC 60079-0 -
General requirements
IEC 60127 series Miniature fuses - series
IEC 60269 series Low-voltage fuses EN 60269 series
IEC 60691 - Thermal-links - Requirements and application EN IEC 60691 -
guide
IEC 60529 - Degrees of protection provided by enclosures - -
(IP Code)
IEC 60034-5 - Rotating electrical machines - Part 5: Degrees EN IEC 60034-5 -
of protection provided by the integral design of
rotating electrical machines (IP code) -
Classification
ISO 965-1 - ISO general purpose metric screw threads - - -
Tolerances - Part 1: Principles and basic data
ANSI/ASME - Pipe threads, general purpose (inch) - -
B1.20.1
ANSI/UL 248 series Standard for low-voltage fuses - series
IEC 60079-31 ®
Edition 3.0 2022-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 31: Equipment dust ignition protection by enclosure "t"
Atmosphères explosives –
Partie 31: Protection contre l’inflammation de poussières par enveloppe "t"
relative à l’appareil
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-4591-0
– 2 – IEC 60079-31:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 General . 10
4.1 Levels of protection. 10
4.2 Equipment groups and ingress protection . 10
4.3 Requirements for Ex Equipment with Level of Protection "ta" . 11
4.3.1 Fault current . 11
4.3.2 Maximum surface temperature . 11
4.3.3 Dust exclusion . 11
4.3.4 Protective Devices . 11
4.3.5 Supplementary internal enclosure . 12
4.3.6 Cells and batteries . 12
4.4 Requirements for Ex Equipment with Level of Protection "tb" and "tc" . 12
4.4.1 Fault current . 12
4.4.2 Maximum surface temperature . 13
4.4.3 Dust exclusion . 13
4.4.4 Thermal protection . 13
4.4.5 Cells and batteries . 13
4.4.6 External plug and socket connections for field wiring connection . 14
5 Construction . 14
5.1 Joints . 14
5.1.1 General . 14
5.1.2 Threaded joints . 14
5.1.3 Gaskets and seals . 14
5.1.4 Cemented joints. 15
5.1.5 Operating rods, spindles and shafts . 15
5.1.6 Windows . 15
5.2 Cable glands, cable transit devices and conduit sealing devices . 15
5.3 Entries . 15
5.3.1 Plain entries . 15
5.3.2 Threaded entries . 15
6 Verification and tests . 16
6.1 Type tests . 16
6.1.1 Type tests for dust exclusion by enclosures . 16
6.1.2 Tests to determine maximum surface temperature . 17
6.2 Routine tests . 18
7 Marking . 18
Annex A (normative) Supplementary requirements for entry devices . 19
A.1 General . 19
A.2 Construction requirements . 19
A.2.1 Cable glands, cable transit devices and conduit sealing devices . 19
A.2.2 Blanking elements and thread adapters . 19
A.3 Type tests . 19
IEC 60079-31:2022 © IEC 2022 – 3 –
A.3.1 Cable glands, cable transit devices and conduit sealing devices . 19
A.3.2 Blanking elements and thread adapters . 19
A.4 Marking . 19
Bibliography . 20
Table 1 – Level of Protection, equipment group and ingress protection (IP) relationship . 11
Table 2 – Overload or malfunction conditions for Level of Protection "tb" . 17
– 4 – IEC 60079-31:2022 © IEC 2022
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
...
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