First time poster here looking for some advice.
I recently built a 2 story garage with dwelling space upstairs. With the number of circuits I plan to have upstairs and downstairs in the garage, I believe I need a 125Amp panel in the building. I'll need 240V for the HVAC unit.
I'll be running the feeder from my main 200A panel at my house.
The 200A panel is approx 160ft away from the garage. 90ft of it would be under the house.
I just dug the ditch from the house to the garage, and it's about 24" deep (from what I understand, the requirement is 18" of coverage, and I plan to put in 2" Cat40 electrical PVC to make it easy to pull the wire through the 70ft of trench).
Couple of questions -
1 - What gauge wire do I need to run to the panel - I'd assume i'd need two hots and a neutral (I have a ufer?? ground in the pad, so I shouldn't need a 4th wire). I was thinking that I need around #2, but maybe 1/0??
2 - Can I use the same wire (contigeously) from the box, under the house, and into the PVC in the trench, all the way to the building, or does there need to be a different type of wire under the house than what is in the buried PVC?
3 - When I go from the external main 200A panel, to under the house and then out of the house again, do i need break-in and break-out boxes? and if so, does the wire actually have to be spliced in there? or can I just leave a loop for future accessibility? It makes sense I would need a break-in box but doesn't make sense that I need to cut the line just for the box.
Any help would be great!
p.s. I also have a water line that I also need to run the same way, it would be PVC and am curious if it's legal to put in in the same ditch, especially if it's only 24" deep but obviously would be easier to not have to dig another ditch if possible....guess the California (Eldorado County code would be the question? and the seperation requirement / min depths of water & or electric.