What does Romex mean in electrical, Romex is brand name for nonmetallic sheathed cable NM-B, commonly used term for NM cable used in residential wiring, with Romex being trade name of Southwire Company, but used generically to refer to NM cable, meaning plastic sheathed cable with multiple conductors inside for house wiring. In electrical, Romex means type NM-B cable containing two or more insulated copper conductors and bare ground wire wrapped in PVC outer sheath, with designations like 14/2 meaning 14 gauge 2 conductors plus ground, 12/2 meaning 12 gauge 2 conductors, used for branch circuits in homes. Romex means nonmetallic sheathed cable for dry indoor locations, not in conduit outdoors, with NM-B being current version with 90 degree conductors but 60 degree ampacity for NM. So Romex in electrical means nonmetallic sheathed cable for residential wiring, with outer plastic jacket protecting inner wires, used for outlets, lights, etc., with Romex being most common residential wiring method in US, with meaning being brand name that became generic for NM cable, similar to Kleenex for tissues, with Romex cable consisting of black hot, white neutral, bare ground, with color coded jacket indicating gauge, white for 14 gauge, yellow for 12 gauge, orange for 10 gauge.
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