1 Scope

This

part of IEC 60079

standard

This

part

standard

The application of electrical equipment in atmospheres, which may contain explosive gas as well as combustible dust simultaneously, may require additional protective measures.

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 take account of any risk due to an emission of flammable or toxic gas from the dust.

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 takes precedence.

Where references are made to other IEC 60079 standards, the referenced requirements found in these standards shall apply as modified by any applicable U.S. National Differences.

Summary of Topics

The revision of UL 60079-18, dated June 9, 2023, is being issued to update the title page to reflect the most recent designation as a Reaffirmed American National Standard (ANS). No technical changes have been made.

Please note that the national difference document incorporates all of the US National Differences for UL 60079-18 based on IEC 60079-18, Explosive Atmospheres – Part 18: Equipment Protection by Encapsulation “m”, (fourth edition issued December 2014).