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10/3 NM-B is non-metallic sheathed cable with three 10 AWG solid copper conductors plus a bare ground, for dry indoor branch circuits. The conductors are PVC-insulated with a nylon jacket rated 90°C, but the NEC caps ampacity at the 60°C column, so it is a 30-amp cable. It suits 240-volt residential runs such as dryers, ranges, water heaters and subpanels, where 10/3 gives you two hots, a neutral and a ground. It is stiffer and harder to pull than 12/2 or 14/2, and it cannot go in wet locations or exposed outdoor runs without protection.
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This is 10/3 Type NM-B non-metallic sheathed cable with ground, also known as Romex. It is used in normally dry residential installations as branch-circuit wiring for outlets, lighting and other residential loads. Its applications are outlined in NEC 2008 and NEC 2011 Article 334.
The cable has three solid annealed soft bare copper conductors plus a bare copper ground. Each conductor is insulated with color-coded PVC under a nylon covering that meets the thickness required for Type THHN. A 30 mil color-coded PVC sheath goes over the completed assembly.
The cable is rated at 600 volts. Its conductor temperature rating is 90°C dry, but its ampacity is limited to 60°C under NEC 2008 and NEC 2011. It may be fished through masonry or tile walls where it is not exposed or subject to excessive moisture or dampness. It is lead free and RoHS compliant.
