Installing circuit for EV charger


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Old 02-28-22, 12:37 PM
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Installing circuit for EV charger

I would like to install an outlet for an EV charger. My current car only uses about 15-20amp but was considering installing a 40-50amp circuit using some NMB 8/2 G wire I have left over from an old project. First question is can I use NMB 8/2 G or do I need 8/3 G or 6/3 G.
When I do install the wiring do I need a 40-50amp GFCI or just a regular breaker.
 
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Old 02-28-22, 02:18 PM
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Some hardwired chargers have GFI protection within.
Otherwise you will need to supply GFI protection.

You can use 8/2 w/gr. Most chargers don't require any 120v...... just straight 240v.
You will need to protect the circuit at whatever the charger requires.
You may have to add tails the wire as #8 may not fit into the receptacle or the breaker.
 
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Old 03-01-22, 11:33 AM
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So looking at installing NEMA 10-50P outlet. I believe the breaker for NM-B 8/2 w g (copper) should be 40Amp with GFCI. Is that correct. I have seen some references that mention 50Amp for 8 awg. From the outlet I would use a pigtail to get to the actual connector for the charger. In my case with the current charger it would be from a 10-50P plug to a NEMA 6-20R outlet.
Make Sense or am I missing something? Take Care
Ian
 

Last edited by ijourneaux; 03-01-22 at 11:59 AM. Reason: Change wire denotation
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Old 03-01-22, 01:26 PM
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When using NM-b cable..... #8 is rated for 40A.
If you run conduit.... there are individual wires that are good up to 50A.
 
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Old 03-03-22, 07:45 PM
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So looking at installing NEMA 10-50P outlet. I believe the breaker for NM-B 8/2 w g (copper) should be 40Amp with GFCI. Is that correct.
Receptacles installed for EV charging require GFCI protection. Yes, that is correct.
 
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Old 03-20-22, 01:03 PM
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Thanks everyone for the helpful comments. I installed a 40amp circuit with a GFCI breaker to a 10-50R receptacle. I have a 10-50 plug to NEMA 6-20R pigtail with an integrated 20amp breaker. Seems to meet my needs. LIttle bit of overkill but was trying to use some 8-2G wire I had left over
 
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Old 03-20-22, 01:25 PM
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A nema 10-50 is the old style ungrounded. I believe you should use a 6-50 or 14-50.
 
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Old 03-20-22, 02:14 PM
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I had 50ft of 8-2g leftover vwr from a previous project that i was trying to use. Tgia is juat for an EV.
 
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Old 03-20-22, 06:34 PM
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The 8-2 NMB cable is fine for a 40 amp 240 volt circuit, it's the receptacle that isn't correct. The 10-50R receptacle has no ground terminal, just 2 hots and 1 neutral. How did you choose the 10-50R receptacle? Was it called out in the installation manual? IF it was, the manual also might be calling for a 4-wire 120/240 volt circuit which would mean you couldn't use the 8-2 NMB cable.
 
 

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