Adding inline breaker to limit current

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CSBolter

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A neighbor with no garage is expecting delivery of an EV. He only has 240V, 30A available inside the house.

For security of use without a lockbox he would like to put a 6-20R outside and limit the circuit to 20A with a switch that goes to the 240V, 30A power inside the house.
Then he could use a 240V, 16 A EV charger.

Would a 20A inline breaker switch in the house be safe?
 
The outdoor outlet will need to be in a box anyway. Just get a box that can take a padlock and then get a padlock. If they have a Schlage C keyway for the house, I like the ABUS padlocks that can be key for the house key. ABUS also makes vesions for other common house key type.
 
I'll add one more thing about the ABUS padlock. When I do use this keyed the same as a house key, I only load 3 of the 5 key pins. That way someone can't cut the lock bolt and reverse engineer the house key.
 
Something like that, but now I think that a breaker would make it more complex than it needs to be.

In Florence, OR, thumbs up on the Waterfront Depot.
 
The entire dwelling is only supplied by a 30a 240v service? Or am I missing something? I’ve only installed a few residential EV chargers but don’t they have control over how much current they draw?
 
Many variables here. There is 240V, 50A for the ac. The 240V, 30A of the dryer is convenient. The breaker box is stuffed. And the EV charger that comes with the EV is (inexplicably) fixed 32A at 240V.

So for Level 2 a new EV charger must be bought; likely a portable Level1+Level2 (with 24A, adjustable down).

Perhaps the best wiring solution is a 10-30R outside and a 240V, 30A inline on/off switch inside, just before reaching the splitter.
 
You can’t come of the dryer circuit, that’s how I interpreted were your trying to get power you could install a contactor and panel wired correctly and use the ac circuit as long as you make it so only one could come on hence the contactor
 
You know that a breaker does not actually limit current but trips when the demand exceeds its rating, right? Just checking.
 
AC/DC and synchro: There are a number of splitters for 240V, 30A power, intended to use with EVs when all that is available is a 10-30R outlet in the house. The Neocharge and Splitvolt devices plug into a 10-30R and have two 10-30R outputs; one is for the high priority side (e.g. the dryer) and the other for the lower priority side (e.g. the EV).
It is not a common situation where 240V,50A is not available, and the breaker box is pretty full. However, given the number of EVs, there must be many owners in this situation.
What makes this case differ from simple use of a splitter is the desire to have a 240V, 30A switch inside the house controlling a 10-30R outside the house, so the owner can deactivate the outside 10-30R when he is away.

ggunn: Yes, the breaker does not limit the current, but it does prevent overload.

synchro: SimpleSwitch looks like it would work, but would be about double the cost (~$600 vs ~$300). And a Neocharge has already been purchased.

Thanks to all of you who have responded.
 
The inline on/off switch turns out not to be what was advertised: 30A but only 125V. It would burn out right away. It sounded like free candy but I wanted to believe it was true.

So a more appropriate switch will be needed, likely requiring a small panel or something like that.
 
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