Mach-Lee
Well-Known Member
- First Name
- Lee
- Joined
- Jul 16, 2021
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- 207
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- Location
- Wisconsin
- Vehicles
- 2022 Mach-E Premium AWD
- Occupation
- Sci/Eng
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- #1
The sizes below are based on the NEC and will work for the majority of installations, but consult a licensed electrician to confirm.
Based on 122ÂşF ambient temps per NEC 310. For single-circuit raceways only.
*Mach-E onboard charger limited to 48A max.
Runs longer than about 100 ft, wires run through an attic, and multiple circuits sharing the same conduit may require larger wire sizes.
Breaker sizes larger than 50A must be hardwired directly to the EVSE.
A neutral wire is not required unless feeding a NEMA 14-50 receptacle, then it must be included.
A 100A circuit is included for reference, future EV’s (such as F150 Lightning) may include an 80 amp charger requiring this circuit.
Breaker and wire size table, for copper only:
| Breaker Size | Max Load | Charging Amps | Miles/hr (240V) | Romex AWG | THHN AWG | Ground AWG | Recommended Min Service |
|---|---|---|---|---|---|---|---|
| 20A | 16A | 16A | 10 | #12 | #12 | #12 | 60A |
| 30A | 24A | 24A | 15 | #10 | #10 | #10 | 100A |
| 40A | 32A | 32A | 20 | #8 | #8 | #10 | 100A |
| 50A | 40A | 40A | 25 | #6 | #8 | #10 | 125A |
| 60A | 48A | 48A | 30 | N/A | #6 | #10 | 150A |
| 70A | 56A | 48A* | 30* | N/A | #6 | #8 | 200A |
| 80A | 64A | 48A* | 30* | N/A | #4 | #8 | 200A |
| 100A | 80A | N/A | #3 | #8 | 200A |
*Mach-E onboard charger limited to 48A max.
Runs longer than about 100 ft, wires run through an attic, and multiple circuits sharing the same conduit may require larger wire sizes.
Breaker sizes larger than 50A must be hardwired directly to the EVSE.
A neutral wire is not required unless feeding a NEMA 14-50 receptacle, then it must be included.
A 100A circuit is included for reference, future EV’s (such as F150 Lightning) may include an 80 amp charger requiring this circuit.
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