Building Cable ( NM -B) NM cable is available in different forms, depending on its intended use. The standard NM cable used for interior residential wiring inside walls and floor and ceiling cavities is known as NM -B. This cable is approved for use in dry locations only; you will never see it used in outdoor locations or buried beneath the ground.
NM is a type of cable that contains insulated conductors enclosed within an overall nonmetallic jacket. It is commonly known as “Romex®”, which is the brand that is most widely used. NM cable contains two or more insulated wires and a bare ground wire.
What Is Non-Metallic Sheathed Cable? – The Spruce, Type NM Cable and More – Electrical Contractor Magazine, Type NM Cable and More – Electrical Contractor Magazine, Type NM Cable and More – Electrical Contractor Magazine, In North America, this type of cable is designated as NM cable . NM means nonmetallic, referring to the outer sheathing; the conductors are of course still metallic. NM was first Listed and described in the NEC in 1926, but it was invented a few years earlier by Rome Wire Company in 1922 in Rome, NY, and marketed under the trade name “Romex”. The name Romex is a trademarked brand of the …
Type NM cable cannot be run outdoors even if it is run in a raceway because this is considered to be a wet location. Type NM cable cannot be run in any raceway other than using it as a sleeve in accordance with 334.15(B) and 300.15(C) or in accordance with 334.12(A)(1) Exception.
Wire & Cable Your Way offers NM -B Building Wire products at great prices – available by the foot available for immediate delivery. Non-metallic sheathed NM -B cable is used in dry applications, as branch circuits for outlets, lighting and other residential loads.
