I'm looking to purchase and install a Tesla home charger since I'm tired of charging on a 120V outlet. I've been reading a bit and think I have a plan, but since this would be my first time doing any electrical work I want to make sure I'm not doing anything stupid.
First: For a 48A max continuous load, I need to provision a 60A circuit. That would require #4 NM wire, but since 4/3 NM wire is extremely expensive everywhere I've looked, I was thinking to do three separate THHN/THHW-2 wires. Is that the right way to do it? Should I use #6 THHN since those have the >60A ampacity required for the circuit, or would #4 be prudent?
Second: I'm going to be running the wire from my main panel through the crawlspace about 50ft to the other side of the house where the charger will be installed. For this crawlspace run (largely perpendicular to the floor joists, I figure I've got three options:
- Just staple the three conductors to the bottom of the joists (seems like a bad idea?)
- Drill holes through nearly 40 floor joists and run the conductors through those holes (presumably the holes would be halfway up the joist)
- run some kind of conduit (PVC or flexible aluminum seem the most attractive) to protect the conductors and said conduit to the joists.
Third: Where the cables exit the crawlspace (through an exterior wall), I was planning to run them through into a length of conduit connected to an LB conduit body and then up through conduit into the Tesla wall charger. I think this is what I've seen done on other exterior EV charger installations, though I haven't seen what goes on behind the wall. Anything specific I should plan to do for the move from crawlspace to exterior?
Appreciate the input.