10:59AM | 01/10/09
Member Since: 06/09/07
4 lifetime posts
I am wiring a bath in my basement and have a question about the circuit. Here is my plan: 12/2 wire runs from the panel to a GFCI outlet, from there to the vanity lights, to the bath fan light; to the wall switch for the light; in the switch, the hot wire would be pigtailed so that it would exit that switch and lead to the switch for the fan and then continue to the fan. I have attached a diagram to clarify. Will that work? I couldn't find anything about adding a circuit to a switch that is at the end of a run. Thanks.
8522 circuit wiring quest


12:21PM | 01/10/09
Member Since: 04/25/05
1915 lifetime posts
That switch is connected to switch leg. At that point there is hot and switched hot. You can extend it from their.

Run the circuit from the receptacle to 2 gang box. (assuming one switch to control both lights and a separate one for the fan).

Then from the switch 12/2 to the vanity light and 12/3 for the fan/light combo.


02:33PM | 01/11/09
Member Since: 06/09/07
4 lifetime posts
What if I used a double switch in a single gang box? I saw them in a wiring book. Then, run a single 12/2 from GFCI receptacle to the single gang box. Each switch is fed from that one wire through pigtails. Then, run a separate 12/2 to fan and lights. Then, I wouldn't have to buy a roll of 12/3, too. How does that sound?
8524 how about this

doug seibert

04:22AM | 01/12/09
Member Since: 08/10/02
842 lifetime posts
the fan/light combo would need to be rated as a "thru-feed".........

You can buy 12-3 at any home store by the foot.....

Check your box fill on the single box ....but WHY?

"......measure Once.....cut Twice....

throw that one away and cut a new one...."


05:34AM | 01/12/09
Member Since: 04/25/05
1915 lifetime posts
I think that you are talking about the switch box.

But all of the fans that have such a little box in them that there is no way to get all of that in there.

Also they don't have spaces for that many sheathed electrical cable connectors.

You can buy as little as 25 ft rolls of 12-3 and I think by the foot at many big box stores.

For the switch I while the double switch in a single gang box will work if the box is big enough I recommend the 2 gang box and separate switches.

That way you can use a timer on the fan if desired.


11:04AM | 01/17/09
Member Since: 06/09/07
4 lifetime posts
Thanks for your help!

So, to wire the fan/light and vanity light, here is what I should do?

12/2 from GFCI receptacle to 2 gang box. Then, split black wires, running one wire to each switch. Connect 12/3 wire to switches; (black to switch one; red to switch two). Run 12/3 wire to fan/light. Inside fan/light, pigtail black and connect to light and black wire that runs to vanity light. Connect Red wire to fan. Pigtail white wire and connect to fan, and white wire running to vanity light.

I hope I finally got it right...
8535 so wire it like this


02:09PM | 01/17/09
Member Since: 04/25/05
1915 lifetime posts
But you need to see if you have space and holes in the wiring box for the both cables and connections.

I have not done a fan/light combo. But the fan only that I have installed just don't have enough run.

You can do the same thing, but run a separate 12-2 from the switch to the lights.

Basically what you said, but at the switch box connect the neutrals from the 2 cables and the incoming power cable.

And pigtail the blacks from 2 cables and connect them to the one of the switches.


04:31PM | 01/17/09
Member Since: 06/09/07
4 lifetime posts
Thanks. I talked to my wife. She is okay with switching the fan/light and the vanity light separately. So, I will just run 12/2 from one switch to the vanity light. Then, run 12/2 from the other switch to the fan/light so the fan and light will always be on together. No worries that way.

I appreciate the education!
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