UNLIMITED FREE ACCESS TO THE WORLD'S BEST IDEAS

SUBMIT
Already an Engineering360 user? Log in.

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

Customize Your Engineering360 Experience

Finish!
Privacy Policy

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

UL 913

Standard for Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, II, III, Division 1, Hazardous (Classified) Locations

active
Buy Now
Organization: UL
Publication Date: 1 April 2022
Status: active
scope:

009130-000000-000000

1 Scope

1.1 * These requirements apply to apparatus or parts of apparatus for installation and use in Class I, II, or III, Division 1 hazardous (classified) locations in accordance with the requirements of the National Electrical Code, NFPA 70.

1.2 These requirements also apply to apparatus or parts of apparatus for installation and use in Zone 20, Groups IIIA, IIIB, and IIIC hazardous (classified) locations in accordance with the requirements of the National Electrical Code, NFPA 70.

1.3 * These requirements also cover associated apparatus located outside of the hazardous (classified) location whose design and construction may influence the intrinsic safety of an electrical circuit within the hazardous (classified) location.

1.4 These requirements are based on consideration of ignition in locations classified as a hazardous location by the presence of flammable or combustible material under normal atmospheric conditions.

1.5 * For the purposes of this standard, normal atmospheric conditions are considered to be:

  1. a) An ambient temperature of 40°C (104°F);
  2. b) An oxygen concentration not greater than 21 percent by volume; and
  3. c) A pressure of one atmosphere.

1.6 This standard does not cover apparatus based on high voltage electrostatic principles such as electrostatic paint spraying.

1.7 Where a requirement of this standard conflicts with a requirement of the applicable requirements for unclassified (ordinary) locations, the requirements of this standard shall take precedence.

Advertisement