Do NOT Plug a 48A Connector into a 50A outlet to charge your EV.

[RickLightning]

True, but not the Ford Mobile Charger, which uses 14-50.

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[PA Lightning]

Just to be clear, you need to make sure the wiring between the breaker and the charger is sized for 60amps.

I put in a 60 amp circuit. Electrician wanted to use 3 conductor wire, I made them use 4 conductor wire in case I ever want to put in an outlet instead (which would require a 50amp breaker, and downsizing to 40amps max for charging).

That is what I did. Have a four conductor wire. I understood they called that 6/3 with ground.

 

[PA Lightning]

400!!! Here I am with what I thought was 100 amp service until the electrician told me the socket meter is actually only good for about 80 (old). Why do you have such a large incoming service?

Don't know why they built the house we bought 8 years ago with a 400 amp, but I am glad they did. Last house before this one had a 400amp service but it was twice the size.

 

[Ostrichsak]

That is what I did. Have a four conductor wire. I understood they called that 6/3 with ground.

When you're naming wire the first number is the gauge of the wire (6 in your case, the lower the number the thicker the wire and the more juice it can handle) and the second number is the number of conductor wires which doesn't include the unshielded ground.

 

[PA Lightning]

When you're naming wire the first number is the gauge of the wire (6 in your case, the lower the number the thicker the wire and the more juice it can handle) and the second number is the number of conductor wires which doesn't include the unshielded ground.

Below is a photo of the line the electrician installed. Don't really know what all of the labels mean.

 

[Toby57]

In the photo above lettering.
CerroMax= An indoor copper building wire brand name made by CerroWire.
SlipWire= Company says a Technology. to make it easier to pull. (install)
NM-B = Romex
6-3 = Three conductors insulated 6 AWG .
W/G = Ground wire. Probably a 10 AWG
600V= Rated for 600 volts. Nearly all romex is rated 600V
(UL)= UL listed
2/22/22 = Date of manufacture.

 

[Toby57]

Maybe I should have been more clear.
Romex used to be a brand name. Many years ago. Over the years it has come to mean just about all Non Metallic sheathed cable.
The B was started when the code changed to not allow NM in insulated walls and attics.
I don't think regular NM is manufactured anymore.

 

[PA Lightning]

In the photo above lettering.
CerroMax= An indoor copper building wire brand name made by CerroWire.
SlipWire= Company says a Technology. to make it easier to pull. (install)
NM-B = Romex
6-3 = Three conductors insulated 6 AWG .
W/G = Ground wire. Probably a 10 AWG
600V= Rated for 600 volts. Nearly all romex is rated 600V
(UL)= UL listed
2/22/22 = Date of manufacture.

So they way I read the chart in post 14, the NM-B romex is only rated for 55amps. So does that mean the max ev charger I can use is a 40amp one?

 

[Pioneer74]

So they way I read the chart in post 14, the NM-B romex is only rated for 55amps. So does that mean the max ev charger I can use is a 40amp one?

If you have it running to a NEMA 14-50, you have to go by the device rating, which would limit you to 40 amps.

50 ÷ 1.25 = 40A.

If you hardwire it, and can find one, you're max is 44 amps.

55 ÷ 1.25 = 44A.

 

[Toby57]

So they way I read the chart in post 14, the NM-B romex is only rated for 55amps. So does that mean the max ev charger I can use is a 40amp one?

The romex in the photo is rated for 55 amps correct. I do not know enough about ev chargers to answer the rest of your question.

 

[Pioneer74]

The romex in the photo is rated for 55 amps correct. I do not know enough about ev chargers to answer the rest of your question.

EVSE's are a continuous load. You have to derate the max allowable amperage of your circuit by 25%.

 

[Toby57]

EVSE's are a continuous load. You have to derate the max allowable amperage of your circuit by 25%.

A continuous load, yes. Must derate as your sentence states.

 

[krusshall]

I am sure there are exceptions in the marketplace but EVSE rated for 48A at 240V are primarily hardwire installation only.

Particularly as it relates to Ford and the LIghtning, the Ford Mobile Charger is 32A max output at 240V and it comes with a receptacle. The Connected Charge Station is 48A max output at 240V and it must be hardwired. The Charge Station Pro is definitely hardwired.

What needs to be said is do not buy a 48A EVSE that uses a receptacle and find another electrician if they are adding a pigtail receptacle to an EVSE which is meant to be hardwired only.

 

[Maquis]

I am sure there are exceptions in the marketplace but EVSE rated for 48A at 240V are primarily hardwire installation only.

Particularly as it relates to Ford and the LIghtning, the Ford Mobile Charger is 32A max output at 240V and it comes with a receptacle. The Connected Charge Station is 48A max output at 240V and it must be hardwired. The Charge Station Pro is definitely hardwired.

What needs to be said is do not buy a 48A EVSE that uses a receptacle and find another electrician if they are adding a pigtail receptacle to an EVSE which is meant to be hardwired only.

The NEC limits plug in EVSEs to a max 50A circuit which means a 40A EVSE. So anything larger MUST be hard-wired to be legal.

 

[Ventorum94]

Hows that working with charging 2 evs? (guessing based on your sig).

Use two Tesla Wall Connectors for charging 2 EVs- they have a sophisticated load share feature, and so even though two 60amp circuits are used (one for each hardwired Wall Connector) you can configure the two chargers to draw a total of 48amps (80% of 60), and not overload your panel. (use Tesla-J1772 adapters for the cords, to charge non-Teslas).
Much cheaper than a new 200amp or 400amp service!

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