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NFPA 496

2017 Edition, January 1, 2017

Complete Document

Standard for Purged and Pressurized Enclosures for Electrical Equipment



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Active, Most Current

EN
Additional Comments:
EFFECTIVE DATE: 06/02/2016
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Referenced Items:

ISA 12.13.01
ISA RP12.4
NFPA 30
NFPA 497

Product Details:

  • Revision: 2017 Edition, January 1, 2017
  • Published Date: January 2017
  • Status: Active, Most Current
  • Document Language: English
  • Published By: National Fire Protection Association (NFPA)
  • Page Count: 29
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

This standard applies to purging and pressurizing for the following:

(1) Electrical equipment located in areas classified as hazardous by Article 500 or Article 505 of NFPA 70

(2) Electrical equipment containing sources of flammable vapors or gases and located in either classified or unclassified areas

(3) Control rooms or buildings located in areas classified as hazardous by Article 500 or Article 505 of NFPA 70

(4) Analyzer rooms containing sources of flammable vapors or gases and located in areas classified as hazardous by Article 500 or Article 505 of NFPA 70

This standard does not apply to electrical equipment located in:

(1) Areas classified as Class I, Zone 0

(2) Areas classified as Class III

(3) Areas where flammable liquids may be splashed or spilled on the electrical equipment

Purpose. This standard provides information on the methods for purging and pressurizing enclosures to prevent ignition of a flammable atmosphere. Such an atmosphere may be introduced into the enclosure by a surrounding external atmosphere or by an internal source. By these means, electrical equipment that is not otherwise acceptable for a flammable atmosphere may be utilized in accordance with Article 500 or Article 505 of NFPA 70