Wire Size GuideNEC 2023 · 2026 · Updated Apr 2026

What wire size for a 50 amp circuit?

Q: What is the minimum wire size for a 50 amp circuit?

The minimum wire size is 8 AWG copper or 6 AWG aluminum per NEC 2023 Table 310.16 with 110.14(C) termination limits applied. For long runs, you may need to upsize to account for voltage drop. See the max distance table above.

Q: Can I use aluminum wire for a 50 amp circuit?

Yes. 6 AWG aluminum handles 50A. Aluminum requires anti-oxidant compound and AL-rated terminals (marked AL/CU on the device). It costs roughly 40-60% less than copper but requires a larger gauge for equivalent ampacity. See the 8 AWG copper vs aluminum comparison.

Q: How far can I run 8 AWG wire on a 50 amp circuit?

At 240V, 8 AWG copper can run approximately 92 feet before exceeding the 3% voltage drop recommendation. For longer distances, upsize to the next gauge. Use the voltage drop calculator for your exact scenario.

Q: What breaker size for a 50 amp circuit?

Use a 50A breaker. The breaker must match the circuit rating, not the wire ampacity. For continuous loads (like EV chargers), the breaker must be rated at 125% of the load per NEC 210.19(A)(1).

For a 50A circuit on a 50A breaker: Use 8 AWG copper (50A capacity) or 6 AWG aluminum (50A capacity). Common applications: electric ranges, large EV chargers, and RV hookups.

Copper8 AWG

Aluminum6 AWG

Breaker50A

Voltage240V

You\'re wiring a full-size electric range in a kitchen remodel, adding an RV hookup in the driveway, or installing a 40A EV charger that needs more power than the standard 32A unit. The 50A circuit is the heaviest single branch circuit most homeowners ever deal with.

All valid wire sizes for a 50 amp circuit

A 50 amp circuit is standard for full-size electric ranges, RV hookups, and 40A EV chargers. At 240V, 8 AWG copper handles up to about 90 feet before exceeding the 3% voltage drop limit. For longer runs, use 6 AWG copper (good to about 145 feet).

NEC Table 220.55 may allow range circuits to be sized by demand load, not nameplate. A single range up to 12kW can use 8 AWG on a 40A or 50A circuit.

Common mistake: The most common 50A mistake is confusing the 14-30 (dryer) and 14-50 (range/RV) receptacles. They look similar but are not interchangeable - a 14-30 is rated 30A and a 14-50 is rated 50A. The second mistake: running 8 AWG on a 50A circuit because Table 310.16 says 8 AWG handles 50A at 75°C. That only works if both ends terminate at 75°C-rated lugs.

Any gauge with ampacity equal to or greater than 50A per NEC 2023 Table 310.16, after 110.14(C) termination limits are applied. Smaller gauge number means thicker wire, higher cost, but lower voltage drop.

Gauge	Material	Capacity	Max distance (3% drop)	Conduit
8 AWG (minimum)	Copper	50A	92 ft	3/4" EMT
6 AWG	Copper	65A	146 ft	3/4" EMT
4 AWG	Copper	85A	234 ft	1" EMT
3 AWG	Copper	100A	294 ft	1" EMT
2 AWG	Copper	115A	370 ft	1" EMT
1 AWG	Copper	130A	468 ft	1-1/4" EMT
1/0 AWG	Copper	150A	588 ft	1-1/4" EMT
2/0 AWG	Copper	175A	750 ft	1-1/2" EMT
3/0 AWG	Copper	200A	937 ft	2" EMT
4/0 AWG	Copper	230A	1200 ft	2" EMT
6 AWG (minimum)	Aluminum	50A	89 ft	3/4" EMT
4 AWG	Aluminum	65A	141 ft	3/4" EMT
3 AWG	Aluminum	75A	178 ft	1" EMT
2 AWG	Aluminum	90A	225 ft	1" EMT
1 AWG	Aluminum	100A	285 ft	1" EMT
1/0 AWG	Aluminum	120A	357 ft	1-1/4" EMT
2/0 AWG	Aluminum	135A	454 ft	1-1/4" EMT
3/0 AWG	Aluminum	155A	566 ft	1-1/2" EMT
4/0 AWG	Aluminum	180A	714 ft	2" EMT

Maximum wire run distance

One-way distance in feet before voltage drop exceeds 3%, per NEC Chapter 9 Table 8 resistance values. If your run is longer than these distances, upsize one gauge.

Gauge	Material	120V	208V	240V	480V
8 AWG	Copper	46 ft	80 ft	92 ft	185 ft
6 AWG	Copper	73 ft	127 ft	146 ft	294 ft
4 AWG	Copper	116 ft	202 ft	234 ft	468 ft
3 AWG	Copper	147 ft	254 ft	294 ft	588 ft
2 AWG	Copper	185 ft	322 ft	370 ft	750 ft
1 AWG	Copper	234 ft	405 ft	468 ft	937 ft
1/0 AWG	Copper	294 ft	508 ft	588 ft	1200 ft
2/0 AWG	Copper	370 ft	652 ft	750 ft	1500 ft
3/0 AWG	Copper	468 ft	810 ft	937 ft	1875 ft
4/0 AWG	Copper	588 ft	1034 ft	1200 ft	2307 ft
6 AWG	Aluminum	44 ft	77 ft	89 ft	178 ft
4 AWG	Aluminum	70 ft	122 ft	141 ft	283 ft
3 AWG	Aluminum	89 ft	154 ft	178 ft	357 ft
2 AWG	Aluminum	112 ft	196 ft	225 ft	454 ft
1 AWG	Aluminum	142 ft	245 ft	285 ft	566 ft
1/0 AWG	Aluminum	178 ft	309 ft	357 ft	714 ft
2/0 AWG	Aluminum	225 ft	394 ft	454 ft	909 ft
3/0 AWG	Aluminum	285 ft	491 ft	566 ft	1153 ft
4/0 AWG	Aluminum	361 ft	625 ft	714 ft	1428 ft

Common 50A circuit projects

electric range/oven

A full-size electric range needs a 50A/240V circuit with 6/3 NM-B to a NEMA 14-50R receptacle mounted behind the range. NEC Table 220.55 allows a single household range rated up to 12 kW to be calculated at 8 kW demand, which is why 6 AWG (55A capacity) works even though some ranges have 12+ kW nameplates. Leave 4-5 feet of cable slack behind the range for pulling it out to clean.

RV outlet (14-50R)

An RV hookup uses a NEMA 14-50R receptacle on a 50A/240V circuit. Run 6/3 NM-B indoors or 6 AWG THHN in PVC conduit outdoors. Mount the receptacle 18-24 inches above grade in a weatherproof box with an in-use cover. GFCI protection is required for outdoor receptacles. For the pedestal-style hookup, use a commercial RV power outlet rated for wet locations.

Level 2 EV charger (40A)

A 40A EV charger (like the Tesla Wall Connector at its highest 240V setting) adds about 37 miles of range per hour. This is a continuous load: 40A x 1.25 = 50A circuit. Run 6/3 NM-B or 6 AWG THHN in conduit. GFCI is required per NEC 625.54. If your panel is in the basement and the charger is in the garage, plan for a 40-60 foot run and check voltage drop.

Frequently asked questions

What is the minimum wire size for a 50 amp circuit?

The minimum wire size is 8 AWG copper or 6 AWG aluminum per NEC 2023 Table 310.16 with 110.14(C) termination limits applied. For long runs, you may need to upsize to account for voltage drop. See the max distance table above.

Can I use aluminum wire for a 50 amp circuit?

Yes. 6 AWG aluminum handles 50A. Aluminum requires anti-oxidant compound and AL-rated terminals (marked AL/CU on the device). It costs roughly 40-60% less than copper but requires a larger gauge for equivalent ampacity. See the 8 AWG copper vs aluminum comparison.

How far can I run 8 AWG wire on a 50 amp circuit?

At 240V, 8 AWG copper can run approximately 92 feet before exceeding the 3% voltage drop recommendation. For longer distances, upsize to the next gauge. Use the voltage drop calculator for your exact scenario.

What breaker size for a 50 amp circuit?

Use a 50A breaker. The breaker must match the circuit rating, not the wire ampacity. For continuous loads (like EV chargers), the breaker must be rated at 125% of the load per NEC 210.19(A)(1).

Do I need GFCI on a 50 amp circuit?

GFCI requirements depend on location, not amperage. NEC 2023 requires GFCI in kitchens, bathrooms, garages, outdoors, basements, laundry areas, and near sinks. Check the GFCI requirements by room for your specific installation.

Common products for 8 AWG Copper circuits

🧵Wire Roll8 AWG copper, 100ftCheck prices on Amazon (paid link) ⚡40A BreakerStandard pairing for 8 AWGCheck prices on Amazon (paid link) 🔋EV ChargerLevel 2, pairs with 8 AWGCheck prices on Amazon (paid link)

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Requirements vary by state. NEC edition, licensing, permits, and GFCI rules differ by jurisdiction. Check your state or pick it below for personalized info across WireRef.

Important: For reference only. Not a substitute for a licensed electrician. Electrical work can cause serious injury, death, fire, or property damage if performed incorrectly. Always hire a licensed electrician for electrical work, especially for service upgrades, panel work, and 240V circuits. Values are derived from NFPA 70 (NEC) for educational purposes. Always verify against your locally adopted NEC edition and amendments - local jurisdictions may enforce stricter requirements. WireRef provides reference information only and is not responsible for work performed based on this content. NEC® is a registered trademark of the National Fire Protection Association. Free NEC access via NFPA · OSHA Electrical Safety · Terms of use.

NEC 2023 references verified April 2026