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
A.1.1.2 Electrical equipment should be located in an area having as low a degree of hazard classification as is practical. Where there is probability of flammable liquid exposure, additional means should be taken to avoid ingress.

Fee may be required