Install generic capability for future car charging. What 240v outlet on the outside of the house is acceptable

240velectric vehicle

I am wiring an old house with new wires and want to have an outlet outside for charging a potential electric car. There is no carport or roof overhang, so weather resistance is important. The wall is still fully open to studs and I have full access to inside and outside of the wall. I was considering a stove or dryer outlet. The house has 100 amp service, but everything inside is on propane, so I would never draw more than 30 amps during normal home use.

Best Answer

Most likely the EV charger will want a NEMA 6-30 or 6-50.

But you can never be sure. It might require a 14-50 or 14-30.

You can certainly preclude any of the NEMA 10 types (hot hot neutral no ground); those will never be used on an EV (except in old homes hijacking the dryer connection).

The "universal donor" cable would be a 6/3 copper. This will allow up to 60A (though, 60A would be hardwired). Some EV chargers are hardwired.

As far as the breaker, they all cost $10 (assuming your panel has space). So you could buy one pre-emptively, but I would just wait.

I certainly hope you picked up on the importance of extra spaces in a panel from countless discussions here and elsewhere. Spaces are dirt cheap at install time; not so cheap later, so I recommend you finish with almost half your spaces unused. Even if that means junking a panel you installed yesterday; believe me, you will thank us later! Although there's nothing wrong with just adding a subpanel; if well-placed it can even cut down on long wire runs, so can pay for itself in wire.

I concur with your assessment that you are unlikely to draw more than 30A much, or to be more precise, I see no trouble with your house supporting a 60A EV charger.