Pictures/diagrams at the end. I will pull permits and would like to do this correctly. I will be disconnecting an unused 40A circuit and replacing it with a new 50A circuit to my garage for a NEMA 14-50 electric vehicle (Tesla) charger. The wiring specifications from Tesla say to use a neutral wire for the NEMA 14-50. This circuit will be submetered for time of day rates specific to the electric vehicle only.
- I will remove the 40A double pole breaker, cap that circuit's wires, and install new 50A double pole breakers
- I will use 6-gauge THWN wire, attaching ground to ground bar, neutral to neutral bar, one hot to each side of the 50A double pole breaker
- The circuit runs to the exterior with LBs at each egress/ingress, passing through PVC conduit and a submeter on its way to the garage
- It runs through studs in the garage wall, exiting at the plastic box for a NEMA 14-50 receptacle
- Do I run individual insulated wires or should all four insulated wires also be sheathed? Relates to my next question regarding the neutral wire. Again this will pass through an exterior raceway so therefore a "wet location." I assume all four are sheathed together.
- The wiring diagram for the submeter only has lines drawn for the two hots. I've drawn in how I believe it should be wired. The neutral bypasses everything in the meter, going straight from the neutral bar at the main panel to the NEMA 14-50 receptacle. Is this correct for the neutral?
- The ground wires are stripped 3/4", attached from ground bar at main panel to the ground lug (?) in the meter, then again from ground lug in meter to the receptacle. No ground attached to the plastic outlet box. Is this correct for the ground?
- I plan to exit the house at LB which goes down into submeter, putting the new submeter next to the existing meter (pictured), then continuing down through the conduit to the garage. If I drill holes through studs inside to do this, do I need bushings?
- The exterior PVC conduit will rest on the masonry foundation. Do I need to secure the conduit to the masonry?
- Should I use 1" PVC conduit, given 4 6-gauge wires?
- What else that I didn't mention will make this easier/safer?