# Thread: the use of two wire romex in three-way switch loop

1. Junior Member
Join Date
May 2003
Posts
3

## the use of two wire romex in three-way switch loop

A Master electrician at work says that it isn't legal to use 12/2, or 14/2, for the travelers in a three way switch loop. Doesn't the NEC allow the use of the two wire romex as the travelers, if the white wire is reidentified?

2. ## Re: the use of two wire romex in three-way switch loop

Yes, this is legal. Ask him what article he would quote that would deem it illegal.

Roger

3. Junior Member
Join Date
Feb 2003
Posts
13

## Re: the use of two wire romex in three-way switch loop

sparky, roger--

You can't use 12-2 or 14-2 because you have to have a return conductor (neutral) that runs with the supply conductors. And you can't use the equipment grounding conductor (bare copper) as a current-carrying conductor.

Or roger, do you set your 3-way circuits up differently than I do?

Cliff

4. ## Re: the use of two wire romex in three-way switch loop

cliff,
300.3(B)(3) permits the use of 2 wire NM in 3-way circuits.
Don

5. ## Re: the use of two wire romex in three-way switch loop

Cliff, the EGC (bare copper) would remain just that.

I don't understand what you mean by,
you have to have a return conductor (neutral) that runs with the supply conductors.
this is not in the NEC as far as NM.

Remember, we are talking about travelers, or one hot wire, in a non inductive wiring method, and unless these single conductors are entering a metal box, this would eliminate 300.20 as covered in 300.3

Roger

6. Senior Member
Join Date
Feb 2003
Location
Georgia
Posts
175

## Re: the use of two wire romex in three-way switch loop

Roger,I think he's talking about feeding the 3-way on one end,carrying the neutral through the 3 wire to the other end, and taking the switch leg up to the lite from there.

I think.

russell

7. a.wayne3@verizon.net Guest

## Re: the use of two wire romex in three-way switch loop

I used 2 wire travelers many times over the years,
In most cases a standard 3 way fed from one end and switched from the other,or a dead ended 3 way uses 3 wires.There are some cases in which it is not necessary to use the 3 wire nm.Where there are multiple switches on a circuit(multi gang) and the neutral from this circuit is already there
Then you can use a 2 wire traveler in lieu of the more expensive 3 wire.Or when there is a 3 way 4 way 3 way switching system and at the 4 way there is a single pole switch then I have run 2 2 wires one as a feed (hot /neutral) and one as travellers.I have seen guys run 2 wire travelers to another circuit and use that neutral IMHO
as long as you are carefull that you don`t share a neutral from another circuit there is nothing wrong with this

8. Junior Member
Join Date
May 2003
Posts
3

## Re: the use of two wire romex in three-way switch loop

Thank-you gentlemen for answering my question so fast.

I did some more investigating on the subject myself, and found some information in Mike Holt's, "1999 NEC Illustrated Changes" book, page 14 figures 2-2 and 2-3. Figure 2-3 states:
"white conductors must be re-identified when used as travelers between 3 and 4-way switches".

Thank-you

9. ## Re: the use of two wire romex in three-way switch loop

Don

Please explain 300.3(B)(3) to me. I do not see how this is allowed. How are you going to comply with 300.20?

I think that 300.3(B) prohibits 12-2 or 14-2. The grounded conductor is not in the same raceway.

Mike P.

10. ## Re: the use of two wire romex in three-way switch loop

Mike,
Using NM cable there is no requirement that all of the conductors of the circuit be in the same raceway. 300.20 can be complied with by using NM connectors listed for more than one conductor or by using nonmetallic boxes. Yes, these installations will create more EMF, but that is not a code issue at this time.
Don

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