Non Metallic Wire Definition

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Non metallic wire definition. See rfh wire below. For example indoor electrical wiring is normally done using nm sheathed cable which stands for non metallic. Outdoor applications require a different type of sheathed cable known as uf cable because of its ability to resist breaking down from exposure to ultra violet light and other outdoor and environmental factors. Of relating to or being a nonmetal.

Nm has evolved from a braided fabric outer jacket surrounding two conductors no ground wire into the color coded plastic jacketed multi conductor cable assembly we use today. For most circuit applications the nm cable commonly used is described as two wire or three wire cable. Modern non metallic sheathed cables such as us and canadian types nmb and nmc consist of two to four wires covered with thermoplastic insulation plus a bare wire for grounding bonding surrounded by a flexible plastic jacket. Metallic cable often used to carry television signals and connect video equipment.

Non metallic tubing nmc romex non metallic cable with solid plastic sheeting. This is in contrast to metallic sheathed cable or conduit wiring in which the bundle of individual conductors is protected by some form of a metal coil or metal conduit. Rough service appliance vacuum cleaner type cord. Some versions wrap the individual conductors in paper before the plastic jacket is applied.

Nm is a quick easy way to get power where you want it and it s relatively cheap compared to other methods of wiring. Major brands of older fabric insulated non metallic sheathed nmc wire using this type of basically cloth insulation included at least the following electrical wire manufacturers listed below. The designation is slightly misleading however as both two wire and three wire cables also contain an additional bare copper grounding wire. The non metallic nm designation refers to the outer sheathing that bundles individual wires together like a cable.

The manufacturers brands and names in this first list are older fabric or cloth covered electrical cable such as that illustrated in this article. The insulator is surrounded by mesh or a metal sheath and covered by a thin plastic layer for protection. Romex non metallic cable with paper wrapping between conductors and plastic sheeting. This designation refers to the number of insulated wire conductors the cable contains.

You may know it as romex or house wire but nonmetallic sheathed cable nm has become a mainstay of residential wiring since it became available almost a century ago.