Southwire Romex® Brand SIMpull® (nonmetallic-sheathed) Cable may be used for both exposed and concealed work in dry locations with ampacity limited to that for 60°C conductors as specified in the National Electrical Code® (NEC). Individual conductor insulation is rated 90°C as required by the NEC and by the UL product standard (UL 719) for terminations in lighting fixtures. 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 wet or damp locations. Voltage rating for NM-B cable is 600 volts. Individual conductors within Type NM-B Cable are not listed or marked as THHN conductors (or any other NEC recognized conductor type) and are not permitted to be installed apart from the complete Type NM-B Cable. Conductors routed inside panelboards and boxes (without the cable jacket) for termination therein are considered part of the complete Type NM-B Cable.
| Cond. Size | 12 AWG 12 AWG | |
| Conductor Number | 2 2 | |
| Cond. Strands | Solid Solid | |
| Diameter Over Conductor (in) (cm) | 0.080 0.20 | inch cm |
| Insulation Thickness (mils) (mm) | 15 0.38 | mils mm |
| Ground Size | 1x12 1x12 | |
| Jacket Thickness (mils) (mm) | 25 0.64 | mils mm |
| Approx. OD (in) (cm) | 0.422 x 0.190 1.07 x 0.48 | inch cm |
| Copper Weight (lbs/1000') (kgs/km) | 59 88 | lbs/1000' kgs/km |
| Approx. Weight (lbs/1000') (kgs/km) | 87 129 | lbs/1000' kgs/km |
* 2x2 construction