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-   -   (2)12-2 wires for (1)12-4 (http://www.diychatroom.com/f18/2-12-2-wires-1-12-4-a-93042/)

deal 01-21-2011 03:19 PM

(2)12-2 wires for (1)12-4
 
I'm planning for a bathroom exhaust/light/heater combo. I know to run 12-2 from a dedicated 20 amp breaker to a combo 3 single pull switch. My question is from the switch to the light combo. If I could find it I would run 12-4 wire, but since I'm already going to have plenty of 12-2 wire can I run (2)12-2 instead of (1)12-4?

clashley 01-21-2011 03:20 PM

Quote:

Originally Posted by deal (Post 575146)
I'm planning for a bathroom exhaust/light/heater combo. I know to run 12-2 from a dedicated 20 amp breaker to a combo 3 single pull switch. My question is from the switch to the light combo. If I could find it I would run 12-4 wire, but since I'm already going to have plenty of 12-2 wire can I run (2)12-2 instead of 12-4?


Yes, as long as you do not exceed the fill capacity on your device box.

Jim Port 01-21-2011 03:26 PM

I find it easier to run a piece of ENT or Smurf tube and use individual conductors in the proper colors. This also cuts down on box fill in a box that is already too small as you can leave out one ground conductor compared to the cables.

Using 2-12/2 to get enough switched hot conductors would not be acceptable code-wise as the white can only be re-marked as a hot to feed the switch, not a switch controlled hot. NEC 200.7

deal 01-21-2011 03:34 PM

Thank you very much I think I'll go the smurf tube route.

nap 01-21-2011 03:38 PM

Quote:

Originally Posted by Jim Port (Post 575150)
I find it easier to run a piece of ENT or Smurf tube and use individual conductors in the proper colors. This also cuts down on box fill in a box that is already too small

It also allows for changes in the future where you might require a different wiring scheme from the switches to the ceiling area. Especially in a bathroom, there are often changes that might require a different wiring scheme.

Speedy Petey 01-21-2011 04:23 PM

Quote:

Originally Posted by Jim Port (Post 575150)
I find it easier to run a piece of ENT or Smurf tube and use individual conductors in the proper colors.

I also never though of this, and it is an awesome idea.

I admit I never thing of smurf tube for anything, but this is a prime example of a good application. :thumbsup:

jbfan 01-21-2011 04:28 PM

Just remember in using smurf, that you need a different box than for romex.

nap 01-21-2011 04:31 PM

Quote:

Originally Posted by jbfan (Post 575188)
Just remember in using smurf, that you need a different box than for romex.


why?

unless you are referring to the NM boxes with built in connectors for NM which is what a typical DIY'er would be using.. Then I see your point.

jbfan 01-21-2011 04:46 PM

Quote:

Originally Posted by nap (Post 575191)
why?

unless you are referring to the NM boxes with built in connectors for NM which is what a typical DIY'er would be using.. Then I see your point.

Thats what I am referring to.

frenchelectrican 01-22-2011 02:26 AM

To OP .,
I did answer that question in other section and in Wisconsin I know not very many place will stock 12-4 NM cable at the moment { most big box store will say special order } and you will have to get them in full spool size not the reduced spool size ATM what I heard { only in 250 foot rolls unless the demand get pretty big then they can go with other size rolls }

But For myself I been doing this trick for long time run smurf or greenfeild and that useally do the trick especally if the unit is Fan / Light / Heater even with nitelight verison as well and with all bathroom exhaust fan with heaters it have to be on it own circuit due the heater wattage.

Merci.
Marc


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