A grounded metal enclosure containing bare or insulated conductors that usually are copper or aluminum bars, rods or tubes, see NEC Article 368.

Source: API RP 14F, Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class 1, Division 1 and Division 2 Locations, Fifth Edition, July 2008. Global Standards

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