Wire Sizing

What Size Wire for 60 Amp 300 Feet Away

Pre-calculated NEC-compliant wire size for 60 amps at 300 feet on a 240V single-phase circuit. Immediate answer below.

Recommended Wire Size

Copper

2 AWG

Voltage drop: 2.91% (6.98V)

Voltage at load: 233V

Controlling factor: Voltage Drop (3% limit)

Aluminum

2/0 AWG

Voltage drop: 2.39% (5.72V)

Voltage at load: 234.3V

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 300 ft.

Wire Comparison Table

Wire Size	Ampacity	V-Drop (V)	V-Drop (%)	V at Load
14 AWG	15A	113.04V	47.1%	127V
12 AWG	20A	71.28V	29.7%	168.7V
10 AWG	30A	44.64V	18.6%	195.4V
8 AWG	50A	28.01V	11.67%	212V
6 AWG	65A	17.68V	7.36%	222.3V
4 AWG	85A	11.09V	4.62%	228.9V
3 AWG	100A	8.82V	3.68%	231.2V
2 AWGREC	115A	6.98V	2.91%	233V
1 AWG	130A	5.54V	2.31%	234.5V
1/0 AWG	150A	4.39V	1.83%	235.6V
2/0 AWG	175A	3.48V	1.45%	236.5V
3/0 AWG	200A	2.76V	1.15%	237.2V
4/0 AWG	230A	2.19V	0.91%	237.8V
250 kcmil	255A	1.85V	0.77%	238.1V
300 kcmil	285A	1.54V	0.64%	238.5V
350 kcmil	310A	1.32V	0.55%	238.7V
400 kcmil	335A	1.16V	0.48%	238.8V
500 kcmil	380A	0.93V	0.39%	239.1V

Table shows all standard AWG/kcmil sizes for 60A at 300 ft on 240V (copper). Green check = meets both ampacity and 3% voltage drop. REC = smallest compliant size.

Key Considerations

For a 60A circuit at 300 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.

For runs exceeding 200 feet, conduit fill becomes important. Verify that the selected wire size fits within the maximum fill allowance of your conduit per NEC Chapter 9, Table 1. Consider upsizing the conduit rather than downsizing the conductor.

Frequently Asked Questions

What size wire do I need for a 60 amp service at 300 feet?▾

For a 60A/240V circuit at 300 feet, use 2 AWG copper (2.91% drop) or 2/0 AWG aluminum. This keeps voltage drop within the NEC-recommended 3% limit.

Can I use aluminum wire for a 60 amp circuit?▾

Yes. Aluminum wire is a cost-effective alternative for larger circuits. For 60A at 300 feet, use 2/0 AWG aluminum (2.39% 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 60A circuit at 300 feet on 240V, exceeding 3% means the load receives less than 232.8V, which can damage sensitive electronics and shorten appliance lifespan.

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