This is 12-gauge, three-conductor non-metallic sheathed cable with a bare ground, rated 600V and 20 amps. It is solid copper NM-B for dry indoor branch circuits, switches and outlets, and the purple jacket marks it as 12/3 rather than the white 14/2 or yellow 12/2. It suits anyone wiring a 20-amp circuit that needs a neutral, such as kitchen small-appliance circuits or a multiwire branch. Against 12/2 NM-B it adds a third insulated conductor, which is what you need for shared-neutral or 240V circuits; against armored or conduit wiring it is cheaper and faster to run but offers no physical protection.
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Buyers rate it highly and describe it as standard, easy-to-pull NM-B that arrives as expected. Most mention using it for 20-amp circuits and liking that the purple jacket is easy to tell apart from other gauges.
This is 12/3 with ground NM-B non-metallic sheathed copper building wire, rated 600 volts and 20 amps. It has a solid purple PVC jacket. It is made for dry indoor use, and the temperature should not exceed 90 °C.
The insulation is PVC. The cable is designed for easier pulling during installation.
A 12/3 cable is used where a third conductor is needed, such as three-way switches, split receptacles, and multi-wire branch circuits with a shared neutral. It is also used for two independent circuits run together. Other uses include residential wiring for lights, switches and outlets, branch circuits, small appliances such as microwave ovens, dishwashers and garbage disposals, HVAC systems, and air voids in tile walls. NM-B applications are specified in Article 334 of the NEC.
