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Chapter 8

Chapter 8. Wiring Materials — Raceways and Boxes. Raceway Systems • Cable Assemblies • Other Wiring Systems • Boxes, Conduit Bodies and Fittings – Article 314. Rigid metal conduit (RMC) is a conduit made of metal.

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Chapter 8

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  1. Chapter 8 Wiring Materials — Raceways and Boxes Raceway Systems • Cable Assemblies • Other Wiring Systems • Boxes, Conduit Bodies and Fittings – Article 314

  2. Rigid metal conduit (RMC) is a conduit made of metal.

  3. A nipple is a short piece of conduit or tubing that does not exceed 24² in length.

  4. Rigid polyvinyl chloride (PVC) conduit is a conduit made of materials other than metal.

  5. A total run of PVC shall not exceed 360° of bends.

  6. Electrical metallic tubing (EMT) is a lightweight tubular steel raceway without threads on the ends.

  7. Flexible metal conduit (FMC) is a raceway of metal strips which are formed into a circular cross-sectional raceway.

  8. Liquidtight flexible metal conduit (LFMC) and liquidtight flexible nonmetallic conduit (LFNC) are raceways of circular cross section.

  9. A strut-type channel raceway is a surface raceway formed of moisture-resistant and corrosion-resistant metal.

  10. A surface raceway is an enclosed channel for conductors which is attached to a surface.

  11. A multioutlet assembly is a metal raceway with factory-installed conductors and attachment plug receptacles.

  12. Armored cable (AC) is an assembly that contains the conductors within a jacket made of a spiral wrap of steel.

  13. Metal-clad (MC) cable is a factory assembly of one or more conductors with or without fiber optic members.

  14. Nonmetallic-sheathed (NM) cable is a factory assembly of two or more insulated conductors having an outer sheath of moisture-resistant, flame-retardant, nonmetallic material.

  15. Service-entrance (SE) cable is a single or multiconductor assembly with or without an overall covering.

  16. A cable tray system (CTS) is an assembly of sections and associated fittings which form a rigid structural system used to support cables and raceways.

  17. Cable trays for multiconductor cables are sized according to Table 392.22(A).

  18. A wireway is a metallic or nonmetallic trough with a hinged or removable cover designed to house and protect conductors and cables.

  19. Wireways are sized according to Chapter 9, Table 5.

  20. A busway is a sheet-metal enclosure that contains factory-assembled aluminum or copper busbars which are supported on insulators.

  21. Overcurrent protection shall be provided at the point where busways are reduced in ampacity.

  22. An auxiliary gutter is any enclosure equipped with a hinged or removable cover that is used to supplement wiring space.

  23. A box is a metallic or nonmetallic electrical enclosure used for equipment, devices, and pulling or termination conductors.

  24. Pull boxes and junction boxes are points in the electrical system which provide access to the raceways entering and leaving the boxes.

  25. Pull and junction boxes are sized for straight or angle pulls.

  26. A conduit body is a conduit fitting that provides access to the raceway system through a removable cover at a junction or termination point.

  27. Box size is calculated by the number and size of conductors contained within the box.

  28. Framing members of suspended ceiling systems are permitted as support for boxes if the framing member is adequately supported and securely fastened to the building structure.

  29. Conduits for boxes not over 100 cu in. with threaded hubs shall be supported within 3¢ where two or more conduits are threaded wrench tight into the box.

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