Standard 60079-31, 2Ndedition,Issue/Revised Date - 2015/6/12

SUMMARY OF REQUIREMENTS

FOR

Standard 60079-31, 2ndEdition,Issue/Revised Date - 2015/6/12

Standard Title- Explosive Atmospheres - Part 31: Equipment Dust Ignition Protection by Enclosure "t"

This document is derived from the following Standard Development Organization (SDO) bulletin(s) or other documentation publicly available to UL subscribers:

Standard Development Organization (SDO) / Document Type
(proposal, bulletin, etc) / Document Designation / Date
UL / Standard / 60079-31 / June 15, 2015
Primary motivator for the Standards revision / International harmonization between IEC 60079-31 and ANSI/UL 60079-31.
CCNs Impacted / AANZ

The following is a summary of the revised/new certification requirements.

Action is Not Required for current certified products and the new/revised certification requirements will be applied in evaluation of the new and revised products effective June 12, 2015.

Section Paragraph Clause / Summary of requirements / Action
4.3.2 / The marked maximum surface temperature shall bemeasured on the external surfaces of the enclosure and thesurfaces of the internal components for equipment withtypes of protection “ta” / No action required. The requirement is introduced to harmonize with IEC 60079-31 Ed. 2. No certifications of this type exist.
4.3.6 / Additional protection for arcing and sparking parts for “ta” / No action required. The requirement is introduced to harmonize with IEC 60079-31 Ed. 2. No certifications of this type exist.
4.4.2 / Limiting the internal pressure test to enclosures where the
seal is not physically constrained from moving.
Requirements for tapered threaded joints without an
additional seal or gasket added. / No action required as the revised requirement represents an extension and not a restriction regarding previous requirements.
5.1.2 / Requirements for cable gland aligned for all levels and
Groups the only difference is now the required IP protection
5.3.2 / No action required as the revised requirement represents an extension and not a restriction regarding previous requirements.
5.2 / Requirements for plain entries added / No action required as the revised requirement represents an extension and not a restriction regarding previous requirements.
5.3.1 / 5 threads for parallel threads only required when no seal is
used / No action required as the revised requirement represents an extension and not a restriction regarding previous requirements.
6.1.1.2 / Test for internal enclosure for level “ta” added. / No action required. The requirement is introduced to harmonize with IEC 60079-31 Ed. 2. No certifications of this type exist.
6.1.2 / Eliminating of the “fault” table and reduction of the dust
layer depth for the thermal test for type of protection “ta”. / No action required as the revised requirement represents an extension and not a restriction regarding previous requirements.