Wire Sizing

What Size Wire for 80 Amp 150 Feet Away

Pre-calculated NEC-compliant wire size for 80 amps at 150 feet on a 240V single-phase circuit. Immediate answer below.

Recommended Wire Size

Copper

3 AWG

Voltage drop: 2.45% (5.88V)

Voltage at load: 234.1V

Controlling factor: Voltage Drop (3% limit)

Aluminum

1 AWG

Voltage drop: 2.53% (6.07V)

Voltage at load: 233.9V

Controlling factor: Voltage Drop (3% limit)

Based on NEC Table 310.16 (75°C column), single-phase, 240V, 3% max voltage drop, one-way distance 150 ft.

Wire Comparison Table

Wire Size	Ampacity	V-Drop (V)	V-Drop (%)	V at Load
14 AWG	15A	75.36V	31.4%	164.6V
12 AWG	20A	47.52V	19.8%	192.5V
10 AWG	30A	29.76V	12.4%	210.2V
8 AWG	50A	18.67V	7.78%	221.3V
6 AWG	65A	11.78V	4.91%	228.2V
4 AWG	85A	7.39V	3.08%	232.6V
3 AWGREC	100A	5.88V	2.45%	234.1V
2 AWG	115A	4.66V	1.94%	235.3V
1 AWG	130A	3.7V	1.54%	236.3V
1/0 AWG	150A	2.93V	1.22%	237.1V
2/0 AWG	175A	2.32V	0.97%	237.7V
3/0 AWG	200A	1.84V	0.77%	238.2V
4/0 AWG	230A	1.46V	0.61%	238.5V
250 kcmil	255A	1.24V	0.52%	238.8V
300 kcmil	285A	1.03V	0.43%	239V
350 kcmil	310A	0.88V	0.37%	239.1V
400 kcmil	335A	0.77V	0.32%	239.2V
500 kcmil	380A	0.62V	0.26%	239.4V

Table shows all standard AWG/kcmil sizes for 80A at 150 ft on 240V (copper). Green check = meets both ampacity and 3% voltage drop. REC = smallest compliant size.

Key Considerations

For a 80A circuit at 150 feet on 240V, both ampacity and voltage drop must be satisfied. NEC recommends keeping the total voltage drop (feeder + branch) under 5%, with no more than 3% on either segment alone.

Copper conductors at 75°C column (THHN/THWN-2) are assumed. If using 60°C terminations, derate the ampacity to the 60°C column values. Verify the temperature rating of your terminals.

Frequently Asked Questions

What size wire do I need for a 80 amp service at 150 feet?▾

For a 80A/240V circuit at 150 feet, use 3 AWG copper (2.45% drop) or 1 AWG aluminum. This keeps voltage drop within the NEC-recommended 3% limit.

Can I use aluminum wire for a 80 amp circuit?▾

Yes. Aluminum wire is a cost-effective alternative for larger circuits. For 80A at 150 feet, use 1 AWG aluminum (2.53% voltage drop). Aluminum requires AL-rated connectors and anti-oxidant compound at all terminations.

What happens if the voltage drop exceeds 3%?▾

Voltage drop above 3% reduces equipment efficiency, can cause motors to overheat, and may violate NEC 210.19(A) Informational Note No. 4. For a 80A circuit at 150 feet on 240V, exceeding 3% means the load receives less than 232.8V, which can damage sensitive electronics and shorten appliance lifespan.

Related Wire Size Calculations

80A / 100 ft

What Size Wire for 80 Amp 100 Feet Away

80A / 200 ft

What Size Wire for 80 Amp 200 Feet Away

80A / 100 ft

Wire Size for 80 Amp EV Charger 100 Feet

100A / 150 ft

What Size Wire for 100 Amp 150 Feet Away

200A / 150 ft

What Size Wire for 200 Amp 150 Feet Away

Need a Custom Calculation?

Different voltage, three-phase, or custom max drop percentage? Use our interactive calculator.

Wire Size Calculator