koolkev
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EVSE wiring and/or GFI Breaker

Mon Feb 29, 2016 4:36 pm

Any comments on installing a GFI breaker for the EVSE circuit? I know the EVSE should have gfi built in but would like a plug in unit so, something to protect the outlet if the unit isn't plugged in.
The panel is an Eaton BR load center.
I think I want a GFI if I can get a breaker for a reasonable price. I would like a 40 or 50 amp circuit. Has anyone installed an Eaton GFI

inphoenix
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Re: GFI Breaker

Mon Feb 29, 2016 4:44 pm

koolkev wrote:Any comments on installing a GFI breaker for the EVSE circuit? I know the EVSE should have gfi built in but would like a plug in unit so, something to protect the outlet if the unit isn't plugged in.
The panel is an Eaton BR load center.
I think I want a GFI if I can get a breaker for a reasonable price. I would like a 40 or 50 amp circuit. Has anyone installed an Eaton GFI
Check if your city/town needs it per code. The cost difference is usually $10 v/s. $100.
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koolkev
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EVSE wiriing

Mon Feb 29, 2016 4:50 pm

I am thinking of installing a 240v 50A circuit. A calculator shows this requires #6. So 6-3?
The panel is at the side of the house next to a driveway that is shared so the power either has to go to the front or back of the house. It would be easy to get through the crawl space but is the crawl space a damp area? It does get wet on the ground side but does wire running below the floor joists above the ground have to be rated for damp spaces? Does it have to be run in conduit/flex?

koolkev
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Re: GFI Breaker

Mon Feb 29, 2016 4:55 pm

I would be happy to go $100 even if it isn't required. I picked one out and was quoted $300 but the counter man inferred that I choose a rare over specked part.

KillaWhat
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Re: EVSE wiriing

Mon Feb 29, 2016 6:17 pm

Keep in mind, that this is for a DEDICATED EVSE circuit, which NEC considers a continuous load.
Your load is a 40A continuous load, which requires a 50A branch circuit, appliance, and receptacle rating.

8 AWG wire is good for 40 amps for 60 degC systems, 50 amps for 75 degC systems, and 55 amps for 90 degC systems. To qualify for the 90 degC rating, *every* point in the system must be 90 degC rated -- and that can be tough. Typically, for ampacity purposes, you look at 60 degC for Romex (NM-B) and 75 degC for wire-in-conduit.

If you're using Romex (type NM cable), it's only good for 45 amps because by code it must be de-rated to the 60 degC rating (NEC 334). AWG 8 is good for 50 amps only if all connection points, breakers, conductors, termination boxes, etc., are all rated for 75 degC or higher. If you're running through an attic that has a high ambient temperature in the summer, you have to de-rate / correct for that per NEC tables 310.15(B)(2).

This is why many electricians will just forego #8 for 50A and install #6, which gives plenty of headroom for all de-rating needs.

So, Yes, go #6
You want 6-2 with a ground.
It has to be dedicated to meet code, and for gods sake, do not put an outlet in the system.
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LeftieBiker
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Re: GFI Breaker

Mon Feb 29, 2016 6:20 pm

If you plug in and unplug your EVSE I think it's a good idea. If not it isn't a terrible idea, but can probably be considered optional.
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dhanson865
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Re: EVSE wiriing and/or GFI

Mon Feb 29, 2016 8:17 pm

Merged the two threads, please keep it here and don't make more threads about your EVSE, wiring, breakers, outlets, etcetera. Just put it all in one thread.
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smkettner
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Re: EVSE wiring and/or GFI Breaker

Mon Feb 29, 2016 8:50 pm

Just stick with the standard breaker. If you must spend extra money go up a size for wire.
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Re: EVSE wiring and/or GFI Breaker

Mon Feb 29, 2016 9:47 pm

6/2 is all you need, but if it doesn't cost that much more I might get 6/3 and install a 14-50 (RV outlet, and also the default outlet Tesla uses). Who knows, some day you or a future owner might want to use the outlet to plug in an RV or some appliance that needs the neutral; if you forego the neutral and use 6/2 then EV charging is pretty much all the circuit's good for.

I'm pretty sure romex in a crawl space is fine, but you'd have to consult the code to be sure. Individual wires in conduit is probably preferred, however. You don't really need a GFI breaker, but if the price isn't exorbitant and you want that extra protection then go for it.
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MikeD
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Re: EVSE wiring and/or GFI Breaker

Mon Feb 29, 2016 10:00 pm

If the EVSE is not going to be moved every now and then, a hardwired EVSE is DEFINITELY safer than a cord-and-plug wired EVSE (but if necessary consider using a receptacle with a locking cover).

If you use a GFCI circuit breaker for a cord-and-plug EVSE, I think you can be assured of 5 ma protection for the entire circuit from the breaker box to the J1772 plug -- even if the internal EVSE GFI has only 20 ma protection (which most EVSE brands have now). The problem is that you may have significant trouble with nuisance GF tripping at the breaker! I can't say one way or the other from personal experience, but I noticed that the Siemens VersiCharge originally recommended a GFCI breaker in its manual for cord-and-plug installation -- but it no longer does. I'm guessing that they found some installations were nuisance tripping -- but I don't know for sure.

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