Hi! I have a question about the best way to install Tesla charger with existing pre-wiring, or whether it needs a new wiring.
I have just bought a new construction house that comes with a 30A pre-wire for car charger. Now it's supposed to be 50A and my builder is going to fix that, so let's assume it is 50A pre-wire.
I contacted one Tesla recommended electrician and they suggested against using pre-wiring for many reasons:
1. 50A is a slower charge and won't be able to use full capacity of the charger at 60A.
2. Will need to do splicing and will be a weak point of the system reliability.
3. Will need conduit.
I am not concerned with #1 first of all. A bit slower charge is fine.
I'm not sure about #2 whether it's really needed. The electrical box that is located where my charger is going to be has around 12 inches to extend beyond the outlet point. So I thought that should be enough to wire into Tesla charger directly.
I am also not sure why a conduit is needed for reason #3. I read online that as long as my pre-wiring uses Romex wire then it should be fine without conduit. And from what I can tell, it is Romex wire, and should still be a Romex wire when my builder fix to be 50A.
So I want to ask for more opinions here whether it is really bad to use pre-wiring? Are splicing and conduit real concerns? Or my electrician just simply wanted to spice things up for a more expensive quote?
Thanks all ahead for awesome replies!