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Romex 12/3 NM-B is copper building wire for 20-amp residential circuits, used for outlets, switches and other branch wiring in dry indoor spaces. It carries three insulated conductors plus a bare ground, and the SIMpull jacket is made to pull through framing with less effort. It suits DIYers and electricians wiring a house or adding circuits. Against basic NM-B, the SIMpull jacket is the main upgrade; it is not for wet locations, conduit fill in damp areas or outdoor runs, where UF or THHN is the right choice.
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Lowest price we've seen: $36.75 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
Electricians and DIYers generally rate NM-B wire on how it handles and pulls, and the SIMpull jacket gets credit for smoother pulls through studs and boxes. Complaints center on stiffness in cold weather and on the jacket being easy to nick when stripping.
The ROMEX NM-B copper building wire (model ROMEX12/3W/GRDMR) is made for residential electrical projects. It can be used in both exposed and concealed applications in dry indoor environments. It is also suited to wiring switches and outlets.
The cable has a SIMpull jacket designed to make it easier to handle during installation. It is meant for areas that are not damp, including air voids of masonry blocks or tile walls. It is made in America.
