NFPA 496: Standard for Purged and Pressurized Enclosures for Electrical Equipment
Current Edition: 2013 Next Edition: 2017

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NFPA 496:
2013 Edition
Item #: 49613
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What is NFPA 496?
NFPA 496: Document Scope
1.1 Scope. 1.1.1 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 1.1.2* 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.
This standard provides information on the methods for purging and pressurizing electrical equipment enclosures to prevent ignition of a flammable atmosphere, whether introduced into the enclosure by a surrounding external atmosphere or by an internal source. Official document scope
What does NFPA 496 address?
In addition to general requirements for pressurized enclosures, specific criteria are presented for Class I and Class II hazardous (classified) locations as specified by NFPA 70: National Electrical Code. NFPA 496 also includes chapters on pressurized control rooms; enclosures having an internal source of flammable gas or vapor; and analyzer rooms containing a source of flammable gas, vapor, or liquid. Table of Contents

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