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EVSE wiring question (US)

968 Views 3 Replies 4 Participants Last post by corfam, Jun 19, 2021

nigela

Discussion Starter · Jun 19, 2021

My electrician initially installed my EVSE in my garage near the panel. We ended up moving it outside, as we had just moved in and the garage wouldn’t accommodate a car.

We’ve just done enough reorganization to get the car in the garage. I’m looking at moving the EVSE back into the garage. Unfortunately, when they moved the unit outside, they removed the wall box and wiring, so I would need to redo the wiring and box. Not a big deal.

My question is: does the wiring inside of the wall need to run in armored conduit, or will Romex NM satisfy code? I don’t know if EVSE is any different from household wiring in code land.

Hardwired unit, so no GFI breaker.

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Huey52

· #2 · Jun 19, 2021

In my locale just the typically insulated 6 AWG insulated wire is fine within the wall structure for a 6/14-50 socket application (40A flow). No conduit required.
However the heavier 4 AWG for a hardwired application is typically in conduit. This for a few reasons, one of which is that it’s easier to run individual wires given how much thicker they are. And the conduit typically extends into the garage space anyway and is required for that exposed run.
I’ll let more up to date folks cite the actual NEC. Or just give the electrician who did the initial work a call.

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Nai3t

· #3 · Jun 19, 2021

I can't outright say yes because i know code varies from locality to locality, and I don't know if it varies on this subject. Where I am, NM in the wall is approved for feeding distribution panels and EVSEs. My inspector signed off on 100 amp service running NM across the house to the sub panel in my kitchen, so I can't imagine 40A service to the EVSE via NM is a problem.

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corfam

· #4 · Jun 19, 2021

nigela said:
My question is: does the wiring inside of the wall need to run in armored conduit, or will Romex NM satisfy code? I don’t know if EVSE is any different from household wiring in code land.

Hardwired unit, so no GFI breaker.

It would also depend on the current rating of your EVSE. 6 gage NM-b is only rated for 55 amps...which is not enough to meet the 80% rule if you wanted to charge your vehicle at ID.4 max rate of 48 amps. You could use an EVSE rated (or configured) at 40 amps though with 6 gage NM-b.

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