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BS EN IEC 60079-31:2024

BS EN IEC 60079-31:2024

$142.49

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

Published By Publication Date Number of Pages
BSI 2024 26
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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 ā€˜Major Technical Changesā€™ C1 ā€“ 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 ā€“ 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 ā€“ Table 2 now includes malfunction conditions for temperature class determination of Level of Protection “tb” converter-fed electric machines. C4 ā€“ Annex A added for entry devices with Type of Protection “t” including cable transit devices.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
6 English
CONTENTS
8 FOREWORD
12 INTRODUCTION
13 1 Scope
2 Normative references
14 3 Terms and definitions
4 General
4.1 Levels of protection
4.2 Equipment groups and ingress protection
15 4.3 Requirements for Ex Equipment with Level of Protection “ta”
4.3.1 Fault current
4.3.2 Maximum surface temperature
4.3.3 Dust exclusion
4.3.4 Protective Devices
Table 1 ā€“ Level of Protection, equipment group and ingress protection (IP) relationship
16 4.3.5 Supplementary internal enclosure
4.3.6 Cells and batteries
4.4 Requirements for Ex Equipment with Level of Protection “tb” and “tc”
4.4.1 Fault current
17 4.4.2 Maximum surface temperature
4.4.3 Dust exclusion
4.4.4 Thermal protection
4.4.5 Cells and batteries
18 4.4.6 External plug and socket connections for field wiring connection
5 Construction
5.1 Joints
5.1.1 General
5.1.2 Threaded joints
5.1.3 Gaskets and seals
19 5.1.4 Cemented joints
5.1.5 Operating rods, spindles and shafts
5.1.6 Windows
5.2 Cable glands, cable transit devices and conduit sealing devices
5.3 Entries
5.3.1 Plain entries
5.3.2 Threaded entries
20 6 Verification and tests
6.1 Type tests
6.1.1 Type tests for dust exclusion by enclosures
21 6.1.2 Tests to determine maximum surface temperature
Table 2 ā€“ Overload or malfunction conditions for Level of Protection “tb”
22 6.2 Routine tests
7 Marking
23 Annex A (normative) Supplementary requirements for entry devices
A.1 General
A.2 Construction requirements
A.2.1 Cable glands, cable transit devices and conduit sealing devices
A.2.2 Blanking elements and thread adapters
A.3 Type tests
A.3.1 Cable glands, cable transit devices and conduit sealing devices
A.3.2 Blanking elements and thread adapters
A.4 Marking
24 Bibliography

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BS EN IEC 60079-31:2024
$142.49