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NFPA 496 Standard for purged and pressurized enclosures for electrical equipment

RegSenseSafety & HealthGeneral Industry SafetyCompressed GasesHydrogenConsensus StandardsIndustry Consensus StandardHazardous Materials Safety - OSHANational Fire Protection Association (NFPA)EnglishFocus AreaUSA

This standard applies to instruments, control rooms, motors, motor controllers, switchgear and similar equipment, and covers the methods for purging and pressurizing enclosures to prevent the build-up and ignition of a flammable atmosphere.

Current edition

  • NFPA 496-2017 Standard for Purged and Pressurized Enclosures for Electrical Equipment, 2017 Edition

Incorporation by reference

The following editions have been incorporated by reference (IBR) into the Code of Federal Regulations (CFR):

IBR approved for Overview of requirements IBR approved edition
29 CFR 1910.103(c)(1)(ix)(b)(1)Employers must ensure that - except as provided at 1910.103(c )(1)(ix)(a) - electrical wiring and equipment located within 25 feet of a point where connections are regularly made and disconnected or within 25 feet of a liquid hydrogen storage container is in accordance with 1910 Subpart S for Class I, Group B, Division 2 locations. Employers must also ensure that when equipment approved for Class I, Group B atmospheres is not commercially availalbe, the equipment is (1) purged or ventilated in accordance with NFPA No. 496-1967, Standard for Purged Enclosures for Electrical Equipment in Hazardous Locations, (2) intrinsically safe, or (3) approved for Class I, Group C atmospheres (this requirement does not apply to electrical equipment which is installed on mobile supply trucks or tank cars from which the storage container is filled).NFPA 496-1967 Standard for Purged Enclosures for Electrical Equipment in Hazardous Locations.

How to purchase

Standards are available for purchase from the American National Standards Institute (ANSI), see webstore.ansi.org, and from the National Fire Protection Association (NFPA), see catalog.nfpa.org.

['Hazardous Materials Safety - OSHA']
['Hydrogen', 'Compressed Gases']
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