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The 12 refers to the size of wire in AWG - American Wire Gauge. 12 gauge wire can legally carry 20 Amps, and would be used if the circuit breaker is 20 A. 14 AWG can carry 15 Amps, used on a 15 A breaker.
The 2 or 3 refers to the number of ungrounded conductors in a cable (such as romex or NM). 12-2 would contain a hot (black) and a neutral (white). 12-3 would contain two hots (black and red), and a neutral (white). Additionally, these cables are available "with ground," meaning a bare ground wire is added to the cable. So a "12-2 with ground" would actually contain three conductors including the bare ground wire.
A 12-2 with ground cable would be used where you needed to run a single 20 A circuit. You are allowed to share a ground and neutral when running two circuits if the circuits are on different legs (phases) in the panel. 12-3 is used for this purpose. It can also be used where you need 240 volts (between the black and red) with a neutral (and ground).
Wiki User
∙ 6y ago
Wiki User
∙ 13y agoCable with a designation of 12 - 2 will have a black, white and bare ground in the cable set.
Cable with a designation of 12 - 3 will have a black, white, red and bare ground in the cable set
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