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Gen 3 wall charger - connect to 80A breaker ok?

Big Earl

bnkwupt
Supporting Member
Jul 12, 2017
6,861
13,477
Springfield, VA
How far is the HPWC going to be from the subpanel? If it is going to be right next to it, get wire that supports the full 80A since you already have that from the sub panel to the main panel. I don't think there would be an issue with a 60A breaker protected by an 80A one and it would allow you some flexibility in the future to add a sub panel with more spots if you have all 4 wires available (may require more wire pulled). If you have 40ft from the subpanel to the HPWC then it might be different but if it's a foot, go as big as you can (4ga) and definitely swap out the subpanel breaker for 60A. Last thing you want is for your HPWC to have a problem and be able to draw 80A before a breaker trips.

He isn't installing an HPWC (gen 1/2 Wall Connector), but a gen 3 Wall Connector that can draw 48 amp max. That said, you can't go wrong by oversizing the wire, as long as it fits correctly in the terminals.
 
"#6 wire" is not specific enough. #6 Romex NM-B and UF-B would technically not meet code since you would have a 60 amp breaker protecting 55 amp wire (yes, I know the device only draws 48 amps ... until there is some sort of malfunction or short). #6 armored cable or 75C/90C wire in conduit will meet code.

Thanks! I’ll be sure to confirm what wire they are using. I may be overthinking it a bit since they are a licensed electrician and approved by Tesla, so chances are they know what they’re doing. Then again they said going with the 80A breaker would be fine…
 
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He isn't installing an HPWC (gen 1/2 Wall Connector), but a gen 3 Wall Connector that can draw 48 amp max. That said, you can't go wrong by oversizing the wire, as long as it fits correctly in the terminals.
I understand it is Gen 3. If devices never drew more than ratings we wouldn’t need breakers to protect the wiring. If he leaves things as they are, something in the HPWC could short or otherwise malfunction and draw up to 80 amps and if the wiring from the sub panel to the HPWC is only rated for the HPWC Gen 3 specs at 60 amps then you are running 80 amps through 60 amp wiring which equals a fire.
 

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