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[JSH]

Originally Posted by oil pan 4

Not very many people need 6.6kw. I do most of my charging with a 2.4kw evse.

I can't see spending money to run a 20 amp circuit. The difference between a $200 and $600 EVSE is nothing if someone is paying an electrification to run a circuit.

[Piotrsko]

Turn the bloody circuit off at the breaker and look at the wire gauge installed in the outlet box. If it is 10 ga, you're good to 20 amps. (It will be marked for the gauge inept). Probably has a 20 amp breaker in the box to start with if the house was built in the last 30 years. Most garages are on their own circuit unless the builder was VERY cheap. I have a 20 amp circuit just for the garage opener in a 70 year old house & it's only a 15 circuit box.

[Isaac Zachary]

Originally Posted by Piotrsko

Turn the bloody circuit off at the breaker and look at the wire gauge installed in the outlet box. If it is 10 ga, you're good to 20 amps. (It will be marked for the gauge inept). Probably has a 20 amp breaker in the box to start with if the house was built in the last 30 years. Most garages are on their own circuit unless the builder was VERY cheap. I have a 20 amp circuit just for the garage opener in a 70 year old house & it's only a 15 circuit box.

But how many are 20amp 240V? Usually there's a 15 or 20amp 120V outlet.

You could wire the white (normally neutral) wire to a double throw 20 amp circuit breaker (if thick enough) as long as your EVSE doesn't have or use the neutral pin. But that would hardly be legal.

[oil pan 4]

For 60C rated house wire 10 gauge is normally ran on a 30 amp breaker. If the wire goes through a real hot area, such as through a metal conduit exposed to direct sun light or a hot attic down breaker it to 25 amps. Same thing with 12 gauge wire, it's normally ran on 20 amp breakers. A 12 gauge 20 amp circuit is all I use to charge my leaf.

Originally Posted by JSH

I can't see spending money to run a 20 amp circuit. The difference between a $200 and $600 EVSE is nothing if someone is paying an electrification to run a circuit.

If a house is wired to code an outdoor receptacle or a garage receptacle can be changed out to 240v one and then rewired to a 2 pole breaker but you better make sure all receptacles are changed over. That's the easiest cheapest way to get 240v power outside.

[redpoint5]

Originally Posted by Isaac Zachary

But how many are 20amp 240V? Usually there's a 15 or 20amp 120V outlet.

You could wire the white (normally neutral) wire to a double throw 20 amp circuit breaker (if thick enough) as long as your EVSE doesn't have or use the neutral pin. But that would hardly be legal.

It's to code if you use a receptacle rated for that. My house came with a 240v 20a circuit and receptacle, and I changed it over to 120v to run a window AC unit someone gave me.

[oil pan 4]

The way I ran my garage branch circuits I ran 12/3 with ground romex to a 2 pole breaker then put the the white wire on the neutral bus in the sub panel, then I was able to run both 240v and 120v receptacles on 2 breakers. Other wise I would have had to run 3 breakers and 2 runs of 12/2 wire.

[Piotrsko]

Wouldn't 12/3 be red black white and ground? Definitely after 2000. Btw on a homelite box, there are 1/2 high dual breakers available that take up only one space but provide 240

Unfortunately, I tend to have to defer to oilpan4 for this stuff. I'm a signal wiring tech

[oil pan 4]

Romex 12/3 with ground is black, red, white and the bare ground.
12/3 flexible cord is only 3 wires.

You can only put the number or circuits listed on the box in the box, so your range and dryer are 1 circuit each. Say you have a 20 circuit panel with 20 breaker slots or 30 circuits with 30 slots. Lets say its a 20/20 box and It's all filled up with say 3 double pole breakers and 14 single pole. So you got 17 circuits. You can only switch out 3 single pole breakers for 1/2 size.
I don't believe I have ever seen half size double pole breakers. You might be able to link 2 half size home line breakers together it would be sketchy. I say cram the standard 15 or 20 amp branch circuits together that supply power to bedrooms and lights to make room and put the 240v circuit on a full size 2 pole breaker.

What I do is buy over sized outdoor panels with usually double the number of circuits as there are spaces. I could fill that box with all 1/2 breakers and it woud be perfectly up to code. For my sub panels I have been using outdoor 125 amp 12 space 24 circuit panels.

[redpoint5]

I better look at my panel. It had a few 1/2 breakers and was full before installing solar, then the solar installer made more room with more 1/2 breakers. I already know they messed up by replacing 15 amp breakers with 20.

[rmay635703]

Originally Posted by redpoint5

I better look at my panel. It had a few 1/2 breakers and was full before installing solar, then the solar installer made more room with more 1/2 breakers. I already know they messed up by replacing 15 amp breakers with 20.

20 amp breakers are fine for 12 gage

In this day and age 14+ gage in wall should be illegal