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New approach to arcing components in hazardous areas

Restricted-breathing enclosures allow general purpose arcing and sparking components to be installed in Zone 2 and Class I Division 2 hazardous locations. Active cooling of the enclosure enables the use of heat-producing arcing components, such as breakers and contactors. The safety standards governing restricted-breathing enclosures are discussed along with the design requirements to satisfy the standards. The pros and cons of adopting restricted-breathing technology are compared with the use of traditional technology, such as explosion-proof enclosures, in Zone 2 and Class I Division 2 hazardous locations. A case study compares component and installation costs between restricted-breathing and other common types of protection. It highlights the advantages of applying ordinary arcing components protected by restricted-breathing enclosures in Zone 2 and Class I Division 2.