Bathroom lighting wiring help

[development1]

Hi!,

I am in the process of wiring an additional set of lights in my bathroom and I need help. The pre-existing 2 gang box has a switch for the wall mount lights and another for the fan. Now I've done some wiring in the past however, the supply wire coming in has a black, red, white and ground, and its wired kind of funny to me. My plan is to replace the 2 gang box with a 3 gang box with three switches; one for the wall mount light, one for the pot lights and another for the bathroom fan how would I go about doing this?

[JP]

It looks like the feed is coming in on the black of the three wire and supplies the power to both switches. The red would be the switch leg  going back to a device. When you add the new switch connect one side of the switch to the existing feed and the hot going to the new fixture to the other side of the switch. The neutral would be connected in the wirenut with all the other neutrals, and of course the grounds with the grounds.


Now the box will be a far bigger challenge, first you will need to remove the existing box without damaging the wires. Next make the hole big enough for the new box, I would use 3 LC boxes connected together and fastened with F straps or hold its as they are called. Get all the wires into the new box as you install it and wire it all up.

[JP]

After posting the previous a thought came to mind that may make your life much easier. They make a double switch which would save you the obvious trouble of having to change the box. All you would need to do is fish the wire into the existing box and wire it up. 

[development1]

Thanks for your help, I ended up adding the 3 gang box.