14/50 outlet for EV

N

nizak

Senior Member
Would it be a code violation to install 6/2 NM cable to feed a 14-50 EV Receptacle?

The charging device only requires H/H/G.

I don’t intend on wiring them this way just asking the question.

Thanks
 
Just make sure to cap off that unused neutral so it doesn't accidentally short against your hots.

Dumb me... phase tape to mark the conductor as hot. No different than an outdoor a/c condenser, stove, or clothes dryer.
 
zbang said:
OTOH, I think it would be a violation as that doesn't wire the device per the instructions, and while an EV might not need the neutral, that would be a problem if someone plugged an recreational vehicle into it.

(The instruction sheet for a Leviton receptacle clearly shows a neutral on the wiring diagram - https://leviton.com/content/dam/lev...instruction_sheet/Instruction-Sheet_1450R.pdf.)
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100% agree with zbang. The plug can forgo the neutral all day long but the receptacle must have the neutral.
 
I just installed one last week. I ran the neutral and connected it. I did this for two reasons.
1.) Instructions for the receptacle shows the neutral connection
2.) Customer may not keep the house and next owner may have an RV and plug into it
 
nizak said:
Would it be a code violation to install 6/2 NM cable to feed a 14-50 EV Receptacle?

The charging device only requires H/H/G.

I don’t intend on wiring them this way just asking the question.

Thanks
Click to expand...
It just depends on your minimum circuit ampacity. Some require 48 amps. EV charging circuits are continuous loads. If you use NM cable, you have to consider it as a 60 C. conductor. #6-2 NM has an ampacity of 55 amps. 48 x 125% = 60 It is my understanding that you need to size your branch circuit conductors and overcurrent devices for these circuits at 125% above the MCA.
 
Rick 0920 said:
It just depends on your minimum circuit ampacity. Some require 48 amps. EV charging circuits are continuous loads. If you use NM cable, you have to consider it as a 60 C. conductor. #6-2 NM has an ampacity of 55 amps. 48 x 125% = 60 It is my understanding that you need to size your branch circuit conductors and overcurrent devices for these circuits at 125% above the MCA.
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A 48A EVSE will not be cord & plug connected.
 
Rick 0920 said:
It just depends on your minimum circuit ampacity. Some require 48 amps. EV charging circuits are continuous loads. If you use NM cable, you have to consider it as a 60 C. conductor. #6-2 NM has an ampacity of 55 amps. 48 x 125% = 60 It is my understanding that you need to size your branch circuit conductors and overcurrent devices for these circuits at 125% above the MCA.
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The one I just wired had a setting on it and I wired it #8 THHN/THWN ran from the panel to the garage in EMT and set it for 50A breaker and the EVSE said the charge rate was 42A so the 125% was already baked into the EVSE
 
Willie Snyder said:
The one I just wired had a setting on it and I wired it #8 THHN/THWN ran from the panel to the garage in EMT and set it for 50A breaker and the EVSE said the charge rate was 42A so the 125% was already baked into the EVSE
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All the ones I've been involved with are like this. The 125% is already accounted for.

Rob G
Seattle
 
Willie Snyder said:
The one I just wired had a setting on it and I wired it #8 THHN/THWN ran from the panel to the garage in EMT and set it for 50A breaker and the EVSE said the charge rate was 42A so the 125% was already baked into the EVSE
Click to expand...
That would work fine as long as every termination in the circuit was rated for 75 C. heat. The OP stated he was using NM cable which has to be considered as a 60 C. conductor.
 
Rick 0920 said:
That would work fine as long as every termination in the circuit was rated for 75 C. heat. The OP stated he was using NM cable which has to be considered as a 60 C. conductor.
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#6 is good for 55A in the 60*C column I do agree it could be a violation to not install a grounded conductor on a receptacle but the conductor ampacity is sufficient with the information given.
 
marmathsen said:
All the ones I've been involved with are like this. The 125% is already accounted for.

Rob G
Seattle
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Granted they could go into the equipment and change the setting but that would be a code violation LOL
 
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