Article 505 of the 1996 National Electrical Code contains provisions for a hazardous area classification system commonly known as the Zone 0 concept. This change in the NEC will allow two separate and independent approaches for using electrical equipment in classified areas. Manufacturers will develop new and modify existing products to meet the standards for both systems. Users must decide if the benefits outweigh the costs of changing not only to the new products but also to new wiring methods.
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