48A EV charger on NEMA 14-50?


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Old 05-16-24, 05:16 PM
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48A EV charger on NEMA 14-50?

I have a friend you wants to install receptacle for EV charger. EV charger is rated at 48A and has NEMA 14-50 plug.
However, I can only put 80% load on a breaker, which is 40A on 50A breaker. And I can only install 50A breaker with NEMA 14-50. Am I wrong?

Is this 48A EV charger just overloading the circuit since 48A on 50A breaker probably won't trip ?
 
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Old 05-16-24, 06:10 PM
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You are correct. Probably it has an option to hard wire (which is the better way to go IMHO).
 
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Old 05-17-24, 05:48 AM
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Most EV charges allow you to set up at different amps. My Tesla charge is an 80A charger, however, I can select from a range of amps 80A, 72A, 64A, 56A, 48A, 40A, 36A, 32A, 28A, 24A, 20A, 16A, 12A
I installed a 50A breaker and opted for 40A charging.
Check the installation instructions to see if you have options.
 
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Old 05-17-24, 08:22 AM
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The 14-50 may require an expensive GFCI in your jurisdiction and should be a premium quality receptacle for safety. Hard wire is cheaper and avoids a point of failure. You can set the charging amperage on most ESVEs to match the amperage of the circuit, i.e. CB and wire size.
 
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Old 05-17-24, 05:13 PM
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All receptacles for EV charging are required to be GFCI protected 625.54
 
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Old 05-17-24, 07:30 PM
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EV Charger in question does not have hardwire option and it is designed to be portable. NEMA 14-50 Plug is permanently attached to the charger. Charging current can be selected, but it is strange to have 14-50 plug as only option and still have 48A capability.

All receptacles for EV charging are required to be GFCI protected 625.54
Haven't thought about this. Looks like more money needs to be spent.

I helped another friend install 60A Tesla wall connector hardwired, but the inspector told him to install GFCI breaker. Tesla wall connector has built in GFCI and the manual specifically says not to install GFCI breaker. I send this information to my friend and my friend forwarded this information to the inspector. The inspector still insisted GFCI breaker is required. He tried calling his supervisors, but no one answering. In the end he just passed saying he doesn't want to go against manufacturer's recommendations.

I'm sure if GFCI breaker was installed, there will be periodic fault trip would happen.
 
 

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