Another question for you construction and electrical
I'm replacing my ground level deck with a poured patio. I'd like to run 110 power under the slab to have power at the outdoor kitchen portion of the project. Can you guys help me figure out how to do this to code?
here's my first stab at it: There's an outlet inside the garage on the wall the patio will abut. My plan is to connect to power at the outlet and come through the exterior wall to an LB type box. Metal conduit will run down from the LB to 6" below grade and run underground below apex 20' if poured slab to an in-ground junction box that will have an access cover that will be lawn level.
Then, once the kitchen pergola is built I can run from the junction box over to and up into the pergola with more metal conduit and terminate in a GFI.
does this sound like it meets national code? (We're in Georgia if it matters)
I would use plastic because rust concerns, and here we have to be min 18" below grade. I would put the gfci in the garage box you plan to tap into and run the outside run off the protected side.
The reason for metal was I read that code only requires metal to be down six inches but I haven't verified that. Good idea on Gfci on the house side, makes sense.
I vote for PVC also. Easier to make watertight, won't rust.
In reply to ultraclyde (Forum Supporter) :
Code requires metal to be only down 6".
That's different than code requires metal conduit when burying 6".
The conduit can stick down into the dirt, and then have no conduit at all. Exterior UF romex is acceptable.
If you use metal conduit, minimum burial depth is 6".
If you use plastic conduit, minimum burial depth is 18".
If you direct bury UF cable with no conduit, minimum depth is 24".
Depths are different under concrete or driveways.
BTW, there is no such thing as waterproof conduit. The humidity in the air inside the conduit will condensate on the inside walls of the conduit. It is normal for water to be sitting in low spots of the conduit and for the cables to be submerged inside the conduit.
I would use PVC conduit.
Hmm.. I'm going to ask the landscaping companies quoting the hardscape if they have an electrician they deal with regularly. There's more here than I want to try to learn in the required time frame. If they don't have one I'll find someone and let them coordinate it. Hopefully if I hire a pro they can have the conduit come up through the slab beside one of my support posts for the kitchen structure and I can take it from there.
As I've gotten older I find I'm a lot quicker to let a pro handle it and just stroke a check (when I can.)
Scroll through 130+ pages of code, see what they say. Will a Building Inspector stop by or are you just doing maintenance?
In reply to 914Driver :
Well...it's an expansion beyond the current wood deck, but it's mostly just concrete patio. According to the permit office I do need a permit because my pergola will have a roof, but no inspection will be required. That might change (ahem) IF I decide to run power to it. 
