I guess this could have been in either of the two sub forums (this and lighting), but I figured a mod could move if necessary, this has to do more with the planning/execution of the wiring/j-boxing more than anything. So, first off, let's get the basics out of the way. This is the first time I've ever attempted to splice wire in my house. SADLY, I do NOT have easy access from the breaker box to the space I need to splice and then add lighting in. Two story slab house. New construction. Carpenters made this place like a fortress, huge support beams everywhere. Electricians drilled holes in some of these load bearing beams and ran most of the wiring THROUGH it and in between the floors...sadface. So no easy access to run new wire from the breaker box to the space like I said before. To be honest, something seems fishy that they didn't need to use junction boxes anywhere (for a circuit), not that I found throughout both attics anyway. It seems that all wires were run directly from the breaker box to its designated place during construction and they just hid those bad boys in between all the plywood. Alright, that was a way too long introduction of the house. I am building storage space UNDER my stairs. I have already taken down the drywall and ensure that whatever stud I took out that was in place was not loading bearing. The thing is...I have Two 14 AWG lines and One 12 AWG line running through where I want to make the doorway to the space under the stairs. The two 14s are for an electrical outlet, that I plan on just moving to another wall after rerouting the lines. The one 12 AWG line is the problem. I have no idea where it is coming from (I am assuming it is from the breaker), but it seems to be going into the bathroom GFCI outlets. It is coming down a stud from the in-between space between the floors, I tried tracing it through the attic, but it's a toss up. I doubt it's the one leading into the HVAC unit, which is also on a 12 AWG, and the only other darn 12AWG lines were in the attic above the garage, coming from the breaker box. [B] WHAT I NEED/WANT TO DO:[/B] Need to splice the 12AWG, so it's out of the way and I can put a door there. I want to put lighting (it'll be two separate lights/switches) in the new spaces that I am constructing. I have a pretty good idea how to get it from the switch to the light. But the source line is the main problem I am having to deal with, since I am going to need to have to splice in the 12AWG line. [B]WHAT I NEED HELP ON[/B] Is it possible to use a 2GANG 1BLANK Plastic Box to do the splice in, or do I need to do the splice in a separate junction box, and then have them running into two separate 1 Gang switches? Diagram attached of current planning. I just really need to know what's the best way of going about this. If my plan looks solid. [ATTACH]60686[/ATTACH] The 12AWG and both lights/switches will be in the same empty space until I put up the drywall, so it's easy access to everything. The only thing I am stuck on is getting started with the splice/junction box. I'll use a 3Gang, blank face junction box if that's what I need and also since it's against the bathroom wall, I am thinking about putting it directly behind the mirror, which I can slide over, or I'll have to cut away underneath the sink cabinets and place it there. Thanks mod for the image adjustments!

My gfci tester shows open ground when I try to test gfci outlet (receptacle) ..is it because there is no ground wire in that romex? this is kinda old house and it has metal junction box but only white and black wire ..is this reason why gfci outlet shows 'open ground' ? if so is there any solution without putting a new romex with ground wire?