White: 14 AWG wire (2.08 mm 2) for 15- amp circuits. The following are nominal current ratings for copper conductors long runs may require thicker wires to minimize voltage drop. Cables found in older installations may not conform with this colour coding. In modern products, the color of the NM cable sheath (or jacket) indicates either the gauge of the current carrying conductors within it, or special properties of the sheathing itself. Today, the name "Romex" is a trademarked brand of the Southwire Company. NM was first listed and described in the NEC in 1926, but it was invented a few years earlier by the Rome Wire Company in 1922 in Rome, New York, and marketed under the trade name "Romex". NM means " nonmetallic", referring to the outer sheathing the conductors are still metallic. In North America, this type of cable is designated as NM cable. "12/2" NM cable with a yellow colored PVC sheath surrounding two insulated and one bare wires (top) and older cloth-sheathed NM cable (bottom) Thermoplastic-sheathed cable is more vulnerable to rodent damage and accidental mechanical damage than wiring within electrical conduit or armoured cable. The type of thermoplastic, the dimensions of the conductors and the colour of their individual insulation (if any) are specified by the regulatory bodies in the various countries concerned. The conductors used may be solid in cross section or multi-stranded. With cables where the current-carrying conductors are of a large cross sectional area (CSA), the protective earth conductor may be smaller, with a lower continuous current carrying capacity. The protective earth conductor may also be covered with green/yellow (or green only) insulation, although, in some countries, this conductor may be left as bare copper. During the "rough in" stage of a wiring project, TPS cable has been run through holes in wooden supports and protective metal plates have been fastened in placeĮach of the current carrying conductors in the "core" is insulated by an individual thermoplastic sheath, coloured to indicate the purpose of the conductor concerned.
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