NM-B (Inside)

Commonly referred to as “Romex” cable, this type of electrical wire (Non-Metallic Sheathed Cable) may be used for both exposed and concealed work in normally dry locations at temperatures not to exceed 90°C (with ampacity limited to that for 60°C conductors), as specified in by the National Electric Code (NEC).

NM-B cable is primarily used in residential wiring as branch circuits for outlets, switches, and other loads. NM-B cable may be run in air voids of masonry block or tile walls where such walls are not subject to excessive moisture or dampness.

Voltage rating for NM-B cable is 600 volts.

Type NM-B Manufacturer’s Specification Sheet.

Type NM-B Wire Composition and Sample Uses.

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