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NFPA 496

Standard for Purged and Pressurized Enclosures for Electrical Equipment

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Organization: NFPA
Publication Date: 1 January 2017
Status: active
Page Count: 29
scope:

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

Document History

NFPA 496
January 1, 2017
Standard for Purged and Pressurized Enclosures for Electrical Equipment
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...
January 1, 2013
Standard for Purged and Pressurized Enclosures for Electrical Equipment
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...
January 1, 2008
Standard for Purged and Pressurized Enclosures for Electrical Equipment
This standard applies to purging and pressurizing for the following: Electrical equipment located in areas classified as hazardous by Article 500 or Article 505 of NFPA 70 Electrical equipment...
July 18, 2003
Standard for Purged and Pressurized Enclosures for Electrical Equipment
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...
August 5, 1998
Standard for Purged and Pressurized Enclosures for Electrical Equipment
A description is not available for this item.
496
January 1, 1993
Standard for Purged and Pressurized Enclosures for Electrical Equipment
A description is not available for this item.
January 1, 1989
STANDARD FOR PURGED AND PRESSURIZED ENCLOSURES FOR ELECTRICAL EQUIPMENT
A description is not available for this item.
June 11, 1986
STANDARD FOR PURGED AND PRESSURIZED ENCLOSURES FOR ELECTRICAL EQUIPMENT
A description is not available for this item.
January 1, 1982
PURGED AND PRESSURIZED ENCLOSURES FOR ELECTRICAL EQUIPMENT
A description is not available for this item.

References

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