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Romex NM-B 12/4 is a 12 AWG nonmetallic sheathed cable with four insulated conductors plus a bare ground, rated 600 volts and 20 amps. Solid copper conductors sit in a PVC jacket with a nylon sheath, and the SIMpull jacket is made to pull through framing more easily. It suits branch circuits that need two hot legs or a switched and unswitched pair, such as multiwire circuits, 240V runs and some smart-switch setups. Against 12/2 and 12/3 NM-B, it carries one more conductor, so it is bulkier and stiffer to bend and needs larger boxes and connectors.
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Romex NM-B 12/4 with ground is a nonmetallic sheathed cable for residential and commercial wiring. It is designed for branch circuits serving outlets, switches, and other loads. It can be installed exposed or concealed in dry locations.
The cable has solid soft annealed copper conductors with PVC insulation, inside a PVC jacket with a nylon sheath. The SIMpull Technology jacket makes the cable easier to pull and install. It is rated for 600 volts and 20 amperes.
