1 Scope

This

standard

part of ISO/IEC 80079

in accordance with the National Electrical Code, NFPA 70

The standard atmospheric conditions for determination of characteristics of combustible dusts are:

• temperature –20 °C to +60 °C,

• pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar) and

• air with normal oxygen content, typically 21 % v/v.

The test methods defined do not apply to:

• recognized explosives, propellants (e.g. gunpowder, dynamite), or substances or mixtures of substances which may, under some circumstances, behave in a similar manner or

• dusts of explosives and propellants that do not require atmospheric oxygen for combustion, or to pyrophoric substances.

Summary of Topics

This revision of ANSI/UL 80079-20-2 dated July 19, 2024 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.

The First Edition of UL 80079-20-2 is an adoption of ISO/IEC 80079-20-2, First Edition, issued by ISO/IEC February 2016 including corrigendum 1 issued March 2017. Please note that the National Difference document incorporates all of the U.S. national differences for UL 80079-20-2.