Electrical Exam Term
NM Cable (Romex)
Non-metallic sheathed cable consisting of two or more insulated conductors and a bare ground wire enclosed in a plastic sheath, commonly used in residential wiring.
Detailed Explanation
NM cable (commonly known by the brand name Romex) is covered by NEC Article 334. NM-B is rated for 90°C but its ampacity is limited to the 60°C column when used in residential applications. It cannot be used in commercial buildings above 3 stories, in wet locations, or where exposed to physical damage. NM cable must be secured within 12 inches of each box and at intervals not exceeding 4.5 feet.
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