Q. What uses are permitted by the NEC for nonmetallic-sheathed (NM) cable?
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A. Type NM and Type NMC cables can be used in the following situations [334.10], except as prohibited in Sec. 334.12:
(1) One- and two-family dwellings of any height and their attached/detached
garages or storage buildings.
(2) Multifamily dwellings permitted to be of Types III, IV, and V construction.
(3) Other structures permitted to be of Types III, IV, and V construction. Cables must be concealed within walls, floors, or ceilings that provide a thermal barrier of material with at least a 15-min. finish rating, as identified in listings of fire-rated assemblies.
Informational Note 1: Building constructions are defined in NFPA 220-2015, Standard on Types of Building Construction, the applicable building code, or both.
Informational Note 2: See Annex E of the NEC for the determination of building types [NFPA 220, Table 3-1].
(4) Cable trays permitted in Types III, IV, or V structures where the cable is identified for the use.
(5) Where within raceways permitted to be installed in Types I and II construction.
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