What size ground wire for 60amps?

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Old 12-27-20, 12:37 AM
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Question What size ground wire for 60amps?

Hello,

I live in Santa Clara County in California. i am planning on installing an EV Charger inside My garage. This a gen 3 tesla wall charger that would allow me to charge car at 48AMPS. I have seen some installs on YouTube where people are using Romex 6/3 with 60amp breaker. Many electricians commented that Romex is rated for 55AMP and that #6 THHN wires should be used instead. The charger will be approximately 30 from the control panel. I am confused about the size of ground wire needed in this install. On one site, I found that #10 bare copper wire Is appropriate, on some other site I read that I should use the same size THHN green wire for ground.

what do you guys recommend? If green wire, stranded or solid? I am planning on running these wires through 3/4 PVC. Also, these new chargers do not require neutral wire so I will be only pulling 2 wires plus ground.

Many thanks in advance!
 
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Old 12-27-20, 05:58 AM
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6/3 Romex is rated 55 amps, but there is no 55 amp breaker made so by code you can go to the next size larger, which is 60 amps. However, if you use Romex it is required to be protected from damage. I do not recommend pulling Romex in conduit.

For 60 amps you need a #10 ground wire. The ground can be solid bare or insulated. Stranded wire will be easier to work with so I would recommend using insulated green stranded.
 
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