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Looks greedy.
Do you have a picture of the wire on the other side of the wall ?
Lowest quote was $950. Purchased all the parts for $102. Took about 3 hours mostly fishing that large ass wire. Glad I didn't run conduit, looks better with the back install.
View attachment 309472
What kind of wire did you use? NM-B? What gauge? What amperage of circuit breaker?
My install is basically the same. I had a hard time waterproofing behind my unit though. I think I need to use some more polyurethane caulk behind mine.
I ran "rigid" (threaded) conduit through the wall.
NM, 6 AWG, 60 amp breaker. I calked behind it but I'll probably add some more just to make sure. It's soooo nice just plugging in and knowing it will be fully charged when i take off again.
So I think this is a code violation. NM cable in the walls is only allowed to use the 60c rating which is 55 amps on 6 awg. I did mine in conduit which allowed me to use the 70c rating which makes it good to 65 amps.
So I think this is a code violation. NM cable in the walls is only allowed to use the 60c rating which is 55 amps on 6 awg. I did mine in conduit which allowed me to use the 70c rating which makes it good to 65 amps.
That's right, but from what I've read is since they don't make 55 amp breakers it's fine to round up to 60. That and the wall connector will only pull 48 amps which is still below the 55. I guess in theory I could up the amps on the wall connector or install something else and it would be against cost but I think this is fine the way it is now.
So I think you are close on this logic, but missing one thing:
You take the expected load and use it to calculate what wire size you need. Your load will be 48 amps, but it is a "continuous" load and so you must size it at 125%. So you need to size your wiring for 60 amps.
Then you decide on the breaker. Yes, you are correct in that you are allowed to select the next size up breaker, however, your load still has to fit within the ampacity of the wire NOT the ampacity of the breaker.
So if there was a setting for 44 amps on the wall connector (80% of 55 amps) you could protect the circuit with a 60 amp breaker and be allowed to draw 44 amps, but it is not a setting. So to make your installation code compliant you have to switch your wall connector down to position eight which is 40 amps.
Or you can switch out to wire in conduit and keep it at 48 amps.
(note that I am not an electrician - but this is my understanding of the code)
The continuous load is for calculating the breaker over current, it doesn't have to do with the conductor size.
6# if fine for a 48 amp load, it's fine for up to a 55 amp load which I'll never come close to. I'm pretty confident this is safe and within code.
Good discussion though, it forced me to look up everything I researched months ago which makes me feel better about everything. The code is a mess, I bet you could ask 10 electricians and you'd get 3 different answers. Same for inspectors.
The continuous load is for calculating the breaker over current, it doesn't have to do with the conductor size.
6# if fine for a 48 amp load, it's fine for up to a 55 amp load which I'll never come close to. I'm pretty confident this is safe and within code.
Good discussion though, it forced me to look up everything I researched months ago which makes me feel better about everything. The code is a mess, I bet you could ask 10 electricians and you'd get 3 different answers. Same for inspectors.
What's confusing is the two quotes were going to use the 6#, so it's odd to say the guys that do electrical work all day every day are doing it wrong. It's also odd that if this isn't code they would do this knowing it would be inspected. Either the two electricians I spoke with suck at their job or we're reading too deep into the code. I know EV chargers are new and such so it's possible they're not fully understanding the load requirements, maybe I'll get a quote from a recommended Tesla electrician to see what they say.
Personally, if it's safe I'm okay with it, if I need it to pass code I'll lower it to 40 amps, still better than 120v. From what I've read too, NM-B is rated up to 70c (or even 90c, I forget) but it gets complicated so they just rate it for 60.
I'll probably lower it to 40 anyway, for the different in charge rate it's better to be safe than sorry.
Wire size calculator...
electrician2.com Wire Size calculator
I could be using the calculator wrong but if you input 48 A in the continuous mode box then check the overcurrent protection box, using NM wire (60 degree) it calculates #6 wire. Does it calculate the same for you?
Shouldn't the box under Special Conditions "OCPD and assembly rated for continuous loads" be checked "yes" since a 60 amp breaker is being utilized? When I tried that, I get #6 wire.