Purging 06 : The process of supplying an enclosure with a protective gas at a sufficient flow and positive pressure to reduce the concentration of any flammable gas or vapor initially present to an acceptable level
NFPA 496 Standard for Purged and Pressurized Enclosures for Electrical Equipment, 2008 ed. (Std: Purged and Pressurized Enclosures for Elctr Equip - Amer) {322 NFC}