For this your minimum size is #4 aluminum (65A). You can also run aluminum without a sub panel, just to the Tesla Wall Connector. Forget the sub panel, $1.20/foot + $40 once Aluminum is cheap, and perfectly safe in heavy feeder applications like this. So figure out what combined ampacity you would want and run that. So that lets us run aluminum feeder, which saves a fortune. One of the nice thing about subpanels is they have lugs appropriate for aluminum wire ( made of aluminum actually). I don't fool around, I think 24-30 spaces is a fine panel size for a garage. Unfortunately most people chintz out on panel spaces, so most subpanels are full. That will allow you to consolidate all other loads in this area to this sub panel - which I remind you is legally required if this is an outbuilding! If there is an existing sub panel and it has enough spaces, just enlarge its feeder.
#50 amp wire size 220 volts thhn conduit full#
Since you specified a costly 3-wire (w/ neutral) feeder for some reason, you might as well get full bang for your buck and feed a sub panel. Most versatile choice, $1.50/foot + $70 once Prices will reflect normality, not crazy COVID pricing (which seems to have about doubled cable prices). Since you didn't specify indoor or outdoor, I can't specify a cable or wire type (unless you run conduit). My understanding is this feature is active now. Unrelated: If you have any thoughts toward a second EV, brief yourself on Wall Connector Power Sharing, manual. You have 3-phase power (not likely outside NYC) AND want to power 2-3 Wall Connectors independently.Note this is mandatory if this is an outbuilding and there is already 240V power there, because you can't have 2 circuits or feeders of the same voltage to the same outbuilding.
You want to feed a sub panel to power other loads there, which actually would be rather elegant I recommend it.
There is no need for 3-wire+ground cable. The Gen 3 Wall connector's instructions are here. NEC 110.3(B) requires you follow the paper instructions which are UL-Listed as part of the device's UL listing. Your distance is short enough that voltage drop won't matter.
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