I'm in the middle of a kitchen remodel and have hit a slight snag and need some advice on how to proceed. I'm moving the oven into an island, which requires moving the 240 line used for the oven.
The original plan was to relocate the current 240 line into the utility room and then run a new line from there to the oven, and splice these connections in a junction box. However this plan is not panning out as the old 240 line is aluminum, not copper, and is only 2 hots and shared ground/neutral rather then the R/B/W/G 4-wire copper that is commonly used today. Mixing aluminum and copper is not a good idea, so rather than proceed with this plan I'd like to look at alternatives.
Run a new 240 line from the breaker box to the location needed for the island. This is what I'd like to do, but I'm unsure of the type of wire and conduit to use. Here is a picture of the back of the house, with breaker box, with the red line being an idea of where to run conduit for this wire:
My questions are, which conduit do I use; EMT or PVC (such. 80 of course)? And which wire do I use? This wire will run right in-between the floor joists when it enters the house, so individual wires probably won't work, so what insulated wire should I use? UF is the only option, right? This will be a 40 amp circuit, so I was thinking 6 gauge, just for overkill.
Since I've already got the new copper wire ran from the basement utility room to the island location, I could just run individual THWN through conduit from the breaker box straight down and in to the utility room and then splice this in a junction box to the wire I already ran. At least in this case I'm splicing copper to copper which makes me less nervous. But the individual wires need to be in conduit inside the house as well, correct? How do I handle the area from where the wires enter the house until they hit the junction box (about 4-5 feet maybe)?
Also, here is a shot of the area where the line would come in to the utility room. You can see the new NM 6-3 wire right next to the old aluminum wire there on the right, with the outside of the house being on the left. The original plan was to just splice those two together...
So that's where I'm at. Any and all help/advice is greatly appreciated.