60 Amp Wire Size: What Gauge Wire Do You Need?
NEC-based wire gauge for a 60 ampbreaker — copper and aluminum sizes, ground wire, conduit, and when to upsize for voltage drop.
For a 60 amp circuit, use #6 AWG copper (rated 65A at 75°C) or #4 AWG aluminum wire.
Based on NEC Table 310.16 (75°C column) and, where noted, Table 310.12 for dwelling services. Confirm termination ratings and local amendments before installing.
60 Amp Wire Size at a Glance
| Copper wire size | #6 AWG (65A at 75°C) |
|---|---|
| Aluminum wire size | #4 AWG |
| Breaker size | 60 amp |
| Ground wire | #10 AWG copper |
| Typical conduit | 1" EMT (four #6 THHN conductors) |
Verify conduit fill for your exact conductor count and insulation type with the conduit fill calculator.
Common Uses for a 60 amp Circuit
- Small sub panels in garages and workshops
- Level 2 EV chargers set to 48A continuous output
- Electric furnaces and large heat pumps
- Tankless water heaters (smaller models)
- Larger welder and machine circuits
When to Upsize for Voltage Drop
At 240V with a full 60 amp load, #6 copper exceeds 3% voltage drop past roughly 90 feet. For a detached garage or shop sub panel — where 60A feeders most often go — plan on #4 copper (about 145 feet) or #2 aluminum for runs beyond that. A 48A continuous EV charger on a 60A circuit deserves the same check.
The NEC recommends (in informational notes to 210.19 and 215.2) keeping voltage drop under 3% on a branch circuit or feeder and 5% total. Ampacity tables ignore distance entirely, so on any run much past 100 feet, check the numbers with the voltage drop calculator before buying wire.
NEC References and Code Notes
- #6 AWG copper is rated 65A at 75°C in Table 310.16, which covers a 60 amp breaker — but only when the terminations are 75°C-rated and no ampacity derating applies.
- #6 NM-B (Romex) is limited to its 60°C ampacity of 55A, which is NOT sufficient for a 60 amp breaker. A 60A circuit run in NM cable needs #4 AWG copper NM-B.
- #4 AWG aluminum is rated 65A at 75°C, covering 60 amps. #2 aluminum SER is a common upgrade choice for 60A sub panel feeders with derating headroom.
- A sub panel feeder must be a 4-wire circuit (two hots, neutral, equipment ground) with neutrals and grounds separated at the sub panel per NEC 250.32 and 408.40.
- The equipment grounding conductor for a 60 amp circuit is #10 AWG copper per Table 250.122.
See the NEC code reference for related articles. Always confirm requirements with your local authority having jurisdiction.
Frequently Asked Questions
Can 6 gauge wire handle 60 amps?
Yes, with conditions. #6 AWG copper THWN/THHN is rated 65 amps at 75°C in NEC Table 310.16, so it is legal on a 60 amp breaker when terminations are 75°C-rated and no derating for heat or conduit fill applies. But #6 NM-B (Romex) is limited to 55A at 60°C and does NOT qualify — in NM cable, a 60 amp circuit needs #4 copper.
What size wire for a 60 amp sub panel?
Use #6 AWG copper THHN in conduit (or #4 copper if using NM-B cable), or #4 AWG aluminum, run as a 4-wire feeder: two hots, a neutral, and a #10 copper equipment ground. At the sub panel, keep neutrals and grounds on separate bars with the bonding screw removed per NEC 250.32.
What size wire for a 60 amp EV charger circuit?
A 60 amp circuit (supporting a 48A continuous charger per the NEC 625.41 125% rule) needs #6 AWG copper THHN in conduit or #4 AWG copper if run in NM-B. Hardwired 48A chargers are the sweet spot for home charging — going bigger rarely pays because few cars accept more than 48A on AC.
Why does Romex need to be bigger for 60 amps?
NEC 334.80 limits NM-B cable to the 60°C ampacity column even though its conductors are 90°C-rated. At 60°C, #6 copper is only good for 55 amps — short of a 60 amp breaker. The same wire as THHN in conduit uses the 75°C column (65A) and qualifies. That is why a 60A circuit is #6 in conduit but #4 in Romex.
Related Tools and Wire Size Guides
Wire Sizing Calculator
Calculate the exact wire gauge for any load, voltage, and distance per NEC tables.
Calculate Wire Size →Voltage Drop Calculator
Check whether your run length forces a larger conductor than ampacity alone requires.
Calculate Voltage Drop →Wire Ampacity Chart
Full NEC Table 310.16 ampacities at 60°C, 75°C, and 90°C for copper and aluminum.
View Ampacity Chart →Breaker Size Calculator
Find the right breaker for a given load, including the 125% continuous-load rule.
Size a Breaker →100 Amp Wire Size: What Gauge Wire Do You Need?
For a 100 amp feeder or circuit, use #3 AWG copper or #1 AWG aluminum wire (THWN/THHN at 75°C).
Read the Guide →100 Amp Sub Panel Wire Size: What Gauge Feeder Do You Need?
For a 100 amp sub panel, use #3 AWG copper or #1 AWG aluminum feeder conductors with a #8 AWG copper equipment ground (4-wire feeder).
Read the Guide →125 Amp Wire Size: What Gauge Wire Do You Need?
For a 125 amp circuit or feeder, use #1 AWG copper or 2/0 AWG aluminum wire (THWN/THHN at 75°C).
Read the Guide →