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It sounds like light switches and lights are usually wired with 14/2 cable. Is it okay to use 12/2 cable instead? Would I need special switches?

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As long as you have a 15A circuit breaker on that circuit, it's OK to use 12/2 NM cable for your lights. Since the maximum current on the circuit will be 15A, you won't need special switches. You should label the wire that it is 15A, not 20A, so that someone else doesn't come along and treat it as a 20A circuit.

  • Pro: 12/2 cable is a slightly better conductor of electricity, so you'll have slightly less loss between the service panel and your fixtures.
  • Cons: it's more expensive, harder to work with than 14/2 cable, and you may need to use larger junction boxes because the NEC allows fewer 12 gauge conductors than 14 gauge in a given volume box.

You'll probably also find that you won't be able to use the insertion fittings on the back of the switches (but that's OK, IMO, because I always use the screws), and you definitely won't be able to use the electrical nuts that come with your lights, so you'll have to get your own (and making a secure connection might be trickier with 12 gauge).

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The problem of confusing someone who comes along later, alone, would put me off doing it. – flamingpenguin Feb 21 '11 at 13:28
Niall C. touched on this a little but it will be much more difficult to work with the 12/2 wire than the 14/2. 12/2 is significantly stiffer and harder to pull through walls or other holes. And then it gets hard to bend and fit the 12/2 wire into a box. If you do not need to use 12/2 then don't... it will make the project take much longer. With that said, if you follow @Niall C's advice in his answer then you can use 12/2 (but I would not recommend it). – Jeff Widmer Feb 21 '11 at 15:30
Not to mention, (at least today, at retail) 12/2 is about 50% more expensive than 14/2. If you have some 12/2 laying around that's one thing, but if you're just trying to buy one type of wire because you need some 12/2 anyways, I would buy what I needed of both, and save the cash and hassle of oversized wire. – gregmac Feb 21 '11 at 19:35
I just spent all weekend replacing every switch and socket in my mother's house and trust me, any opportunity you get to avoid working with 12/2 conductors in a tiny single gang box - take it. It basically doubles the amount of time it takes me to make up a box. And when you're running 2 or 3 conductors in/out of a box... UGH – kkeilman Feb 23 '11 at 2:18
If the entire circuit is 12/2 wire, isn't that sufficient to make it a 20A circuit? Why would you need only a 15A circuit breaker then? – BlueRaja - Danny Pflughoeft Aug 12 '13 at 22:28

Yes, it is okay to use 12-2 cable to supply lighting fixtures. The other answer indicates that it even with 12-2 you have to use a 15A breaker for lighting circuits which is not strictly correct.

If the entire circuit is 12AWG (other than fixture wires), then a 20A breaker may be used.

If only part of the circuit is 12AWG while other parts are 14AWG (other than fixture wires), then a 15A breaker must be used because of the allowable ampacity through 14AWG. In general, I would recommend avoiding mixing 14AWG and 12AWG on the same circuit to avoid confusion. If necessary, I would highly recommend labeling the circuit at the breaker with a note explaining the combination of 12AWG and 14AWG wire on the circuit. I think this is the situation Niall C's answer was explaining.

Fixture wires in either case must comply with the requirements listed in 240.5. Note: This is why many lighting fixtures (e.g. ceiling fans, dome lights) and light switches with built-in wires (e.g. combination switch/occupancy sensor, combination switch/timer) have wires smaller than 14AWG.

From the 2014 NEC (NFPA-70):

Note: In the 2011 edition, the text of 210.22 and 210.23 were in a single clause, but essentially said the same thing. These requirements are not new in the 2014 standard.

210.22 Permissible Loads, Individual Branch Circuits. An individual branch circuit shall be permitted to supply any load for which it is rated, but in no case shall the load exceed the branch-circuit ampere rating.

210.23 Permissible Loads, Multiple-Outlet Branch Circuits. In no case shall the load exceed the branch-circuit ampere rating. A branch circuit supplying two or more outlets or receptacles shall supply only the loads specified according to its size as specified in 210.23(A) through (D) and as summarized in 210.24 and Table 210.24.

(A) 15- and 20-Ampere Branch Circuits. A 15- or 20-ampere branch circuit shall be permitted to supply lighting units or other utilization equipment, or a combination of both, and shall comply with 210.23(A)(1) and (A)(2).

Exception: The small-appliance branch circuits, laundry branch circuits, and bathroom branch circuits required in a dwelling unit(s) by 210.11(C)(1), (C)(2), and (C)(3) shall supply only the receptacle outlets specified in that section.

(1) Cord-and-Plug-Connected Equipment Not Fastened in Place. The rating of any one cord-and-plug-connected utilization equipment not fastened in place shall not exceed 80 percent of the branch-circuit ampere rating.

(2) Utilization Equipment Fastened in Place. The total rating of utilization equipment fastened in place, other than luminaires, shall not exceed 50 percent of the branch-circuit ampere rating where lighting units, cord-and-plugconnected utilization equipment not fastened in place, or both, are also supplied.

240.5 Protection of Flexible Cords, Flexible Cables, and Fixture Wires. Flexible cord and flexible cable, including tinsel cord and extension cords, and fixture wires shall be protected against overcurrent by either 240.5(A) or (B).

(A) Ampacities. Flexible cord and flexible cable shall be protected by an overcurrent device in accordance with their ampacity as specified in Table 400.5(A)(1) and Table 400.5(A)(2). Fixture wire shall be protected against overcurrent in accordance with its ampacity as specified in Table 402.5. Supplementary overcurrent protection, as covered in 240.10, shall be permitted to be an acceptable means for providing this protection.

(B) Branch-Circuit Overcurrent Device. Flexible cord shall be protected, where supplied by a branch circuit, in accordance with one of the methods described in 240.5(B)(1), (B)(3), or (B)(4). Fixture wire shall be protected, where supplied by a branch circuit, in accordance with 240.5(B)(2).

(1) Supply Cord of Listed Appliance or Luminaire. Where flexible cord or tinsel cord is approved for and used with a specific listed appliance or luminaire, it shall be considered to be protected when applied within the appliance or luminaire listing requirements. For the purposes of this section, a luminaire may be either portable or permanent.

(2) Fixture Wire. Fixture wire shall be permitted to be tapped to the branch-circuit conductor of a branch circuit in accordance with the following:

(1) 20-ampere circuits — 18 AWG, up to 15 m (50 ft) of run length

(2) 20-ampere circuits — 16 AWG, up to 30 m (100 ft) of run length

(3) 20-ampere circuits — 14 AWG and larger

(4) 30-ampere circuits — 14 AWG and larger

(5) 40-ampere circuits — 12 AWG and larger

(6) 50-ampere circuits — 12 AWG and larger

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