48 A charger, hardwired on a 60 A breaker: parts list
Short answer: A 48 A charger needs a 60 A breaker, not 40 A: 48 A × 125% = 60 A. It must be hardwired. Tesla's manual calls for 6 AWG copper rated 90°C with a 75°C breaker, or 4 AWG if the breaker is rated 60°C.
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| Part | What to use |
|---|---|
| Circuit breaker | 60 A two-pole (48 A × 125% = 60 A) |
| Wire | 6 AWG copper (65 A at 75°C) with a 75°C-rated breaker; 4 AWG with a 60°C breaker or NM-B cable (70 A at 60°C) |
| Conduit | ¾ in. default, 1 in. optional on the Tesla Gen 3; ChargePoint uses a ¾ in. knockout |
| Charger | Hardwired only (Tesla Gen 3: 60 A → 48 A, 11.5 kW; ChargePoint Home Flex: 60 A → 48 A) |
| Terminal limit | Tesla accepts 12–4 AWG copper; ChargePoint's field terminal takes 6 AWG at most (rated 105°C, use 90°C copper wire) |
Power you get
| At 240 V | 11.5 kW |
|---|---|
| At 208 V | 10.0 kW |
| Added in 8 hours | 92 kWh |
Things to check
- No NEMA plug-in setup is listed at 48 A. Both manuals require hardwiring.
- The 4 AWG option won't fit a ChargePoint Home Flex, whose terminal tops out at 6 AWG, so check the brand's terminal range before buying wire.
- 11.5 kW for eight hours is about 92 kWh. On 208 V the 48 A works out to about 10.0 kW.
Ground-wire size is not listed; your electrician sizes it under NEC Table 250.122. Have a licensed electrician do the work and pull the permit. All four setups.
Sources: Mike Holt – Article 625 Electric Vehicle Power Transfer System (PDF); NEC Table 310.16 ampacities (nectables.com restatement); Tesla – Gen 3 Wall Connector installation manual (PDF); ChargePoint – Home Flex: wire the circuit (accessed 2026-10-25).