ESolar
Senior Member
- Location
- Eureka, CA Humboldt County
- Occupation
- Electrician/Contractor
The Tesla wall charger is single phase 200 - 240 AC. It operates with up to a 60 amp OCPD for 48 anp continuous. For conductors they spec the following:
"If installing for maximum power, use minimum 6 AWG, 90° C-rated copper wire for conductors.
NOTE: Upsize conductors if necessary.
For sites with multiple Wall Connectors, each Wall Connector must have its own branch circuit with L1, L2/N, and Ground."
First: Can I run wires for two Tesla plugs using four 6 AWG, 90° C in 3/4 EMT using the EMT as the EGC?
Second: Is there a need to "Upsize conductors"?
My conduiut may get hot because it's routed between the ceiling and roof (I picked 123 - 131 F).
I spec the following:
6 Gauge 90 degree C THHN (three conductors and a smaller #10 ground)
75 degree C termination
310.15(B): 65 amp conductor (based on the 75 degree C termination)
310.15(B)(2)(a): I derate the conductor for temp by 0.76
65 amps x 0.76 = 49.4 amps; Not quite 50 amps, but very close.
So I assume that am relegated to a max 45 amp OCPD (versus 50 amp) breaker and a max continuous load of 36 amps.
But then I find that this online calulator gives the Tesla answer: http://www.electrician2.com/calculators/wireocpd_ver_1_reverse.html
The calculator includes the temp rating for the terminators.
In the calculator they rate the conductor at 57 amps [(75 amps for the 90 C wire) x 0.76 = 57 amps] and spec a 60 amp OCPD for a continuous load of 48 amps.
They also recommend a #10 ground.
"If installing for maximum power, use minimum 6 AWG, 90° C-rated copper wire for conductors.
NOTE: Upsize conductors if necessary.
For sites with multiple Wall Connectors, each Wall Connector must have its own branch circuit with L1, L2/N, and Ground."
First: Can I run wires for two Tesla plugs using four 6 AWG, 90° C in 3/4 EMT using the EMT as the EGC?
Second: Is there a need to "Upsize conductors"?
My conduiut may get hot because it's routed between the ceiling and roof (I picked 123 - 131 F).
I spec the following:
6 Gauge 90 degree C THHN (three conductors and a smaller #10 ground)
75 degree C termination
310.15(B): 65 amp conductor (based on the 75 degree C termination)
310.15(B)(2)(a): I derate the conductor for temp by 0.76
65 amps x 0.76 = 49.4 amps; Not quite 50 amps, but very close.
So I assume that am relegated to a max 45 amp OCPD (versus 50 amp) breaker and a max continuous load of 36 amps.
But then I find that this online calulator gives the Tesla answer: http://www.electrician2.com/calculators/wireocpd_ver_1_reverse.html
The calculator includes the temp rating for the terminators.
In the calculator they rate the conductor at 57 amps [(75 amps for the 90 C wire) x 0.76 = 57 amps] and spec a 60 amp OCPD for a continuous load of 48 amps.
They also recommend a #10 ground.
