48A Tesla Wall Connector Wire Size at 75 Feet
Seventy-five feet is the middle of the common garage runs. Ampacity stays on the 125 percent continuous rule. Drop is calculated at 48 A.
Formula SSC-2026.1
K method · SSC-2026.1
Minimum size
6 AWG · 13.3 mm²
Single conductor set
Voltage drop
3.54 V
1.47% · end 236.5 V
Power loss
170 W
I²R at the operating current
Required ampacity
60.0 A
Each conductor 65 A
Material estimate
$597.00
3 conductors + EMT
Conductor weight
22.1 lb
10.0 kg · approximate insulated weight
Circle diameters track circular mils. The drawing is a schematic, not a conduit-fill layout.
| Item | Net | Waste | Order | Unit price | Line total |
|---|---|---|---|---|---|
| copper 6 AWG · 13.3 mm² | 75 ft one way | cuts excluded | 3 conductors | USD | $458.25 |
| EMT conduit | 75 ft | — | 75 ft | USD | $138.75 |
| Material | Minimum size | mm² | Drop | End voltage | Loss |
|---|---|---|---|---|---|
| copper | 6 AWG · 13.3 mm² | 13.3 | 1.47% | 236.5 V | 170 W |
| aluminum | 4 AWG · 21.2 mm² | 21.2 | 1.52% | 236.3 V | 176 W |
| Distance | Minimum size | Drop | Percent | End voltage |
|---|---|---|---|---|
| 50 ft | 6 AWG · 13.3 mm² | 2.36 V | 0.98% | 237.6 V |
| 75 ft | 6 AWG · 13.3 mm² | 3.54 V | 1.47% | 236.5 V |
| 100 ft | 6 AWG · 13.3 mm² | 4.72 V | 1.97% | 235.3 V |
Show the deterministic formula
Single phase: Vdrop = 2 × K × I × D / cmil. Three phase: Vdrop = 1.732 × K × I × D / cmil. K is 12.9 for copper and 21.2 for aluminum. D is one-way feet.
Percent drop = Vdrop ÷ source voltage × 100. Green is 3% or less, amber is 3 to 5%, and red is over 5%. Power loss is I²R on the current-carrying conductors.
The smallest conductor that meets both the ampacity (125% when continuous) and the drop limit is selected. Ampacity does not include bundling or temperature correction.
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Project: 48A Tesla Wall Connector Wire Size at 75 Feet
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This sheet is an estimate for ordering and layout discussion. It is not a sealed design. Confirm the quantities with a licensed local professional and the authority having jurisdiction before you buy or build.
Engineering notes
Seventy-five feet is the middle of the common garage runs. Ampacity stays on the 125 percent continuous rule. Drop is calculated at 48 A. The run is 75 ft one way at 48 A on 1ph-240. K is 12.9 for copper and 21.2 for aluminum. Ambient temperature, bundling, and rooftop adders are not applied.
Code reference
NEC 210.19(A) and 215.2(A) informational notes recommend 3 percent on a branch circuit and 5 percent total with the feeder. Ampacity follows the 75°C column of Table 310.16 plus the small-conductor limits. Confirm the adopted edition.
Field questions
- What current is used for the 48 A voltage drop?
- Voltage drop uses the operating amps. Ampacity uses 125 percent because the load is marked continuous.
- Does this replace the equipment installation manual?
- No. The nameplate, the breaker, and the adopted NEC edition still control. This page is the K-method size and the percent drop.
- Can I switch copper and aluminum?
- Yes. The conductor control and the comparison table both recompute size, drop, and the planning cost.
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