NEMA Standards Publication FB 1-2014
Fittings, Cast Metal Boxes, and Conduit Bodies
for Conduit, Electrical Metallic Tubing, and Cable
This Standards Publication covers fittings that are a part of electrical raceway systems designed for use as intended by the requirements of the National Electrical Code® (NEC), NFPA 70. Specifically, this standard covers fittings for use with non-flexible tubular raceways: Rigid and Intermediate Metal Conduit and Electrical Metallic Tubing. Also included are fittings for use with flexible conduit and cable raceways, including Flexible Metal Conduit and liquidtight flexible conduits, Armored Cable, Metal Clad Cable, Tray Cable, Mineral Insulated Cable, Flexible Cord, Nonmetallic Sheathed Cable, and Service Entrance Cable.
This standard also includes cast metal outlet boxes and covers, as well as conduit bodies and covers, which when designed for the purpose, serve as a box intended to house conductor splices and/or wiring devices; and cast metal junction boxes, pull boxes, and covers.
This standard does not include standard conduit couplings of the type provided with lengths of Rigid and Intermediate Metal Conduit, or threaded conduit nipples, or threaded or unthreaded factory-made bends derived from Rigid and Intermediate Metal Conduit or Electrical Metallic Tubing.
This standard does not apply to fittings, boxes, or enclosures that are for use in Class I, Division 1; Class II, Division 1; Class III, Division 1; Class I, Zones 0, 1, 2; Zones 20, 21, or 22 hazardous (classified) locations. Exceptions are those ordinary (unclassified) location fittings and enclosures that are specifically permitted by the NEC in these locations.