NFPA 496 电气设备的气体保护标准
日期:2012-02-09 16:42
NFPA 496 Standard for Purged and Pressurized Enclosures for Electrical Equipment
NFPA 496 电气设备的气体保护标准
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
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