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What Size Wire for 50 Amps?

For 50 amps with the displayed 75 C termination defaults, start with 8 AWG copper or 6 AWG aluminum. If the equipment must be treated at 60 C, the common chart answer moves larger.
Load
50 A
Distance
0 ft entered
Band
Appliance / mid branch
Defaults
Non-continuous, 75 C lugs, 86 F, 240 V single-phase
Conductor count
3 current-carrying

Computed Starting Point

The table uses common defaults. Change the calculator inputs for the actual installation.

MaterialComputed sizeOCPDUsable ampacityGoverning constraintDefault check
Copper8 AWG50 A50 ATermination rated 75 CPasses defaults
Aluminum6 AWG50 A50 ATermination rated 75 CPasses defaults
What Size Wire for 50 Amps? under common non-continuous defaults: THHN or XHHW-2 insulation, 75 C terminations, 86 F ambient, 240 V single-phase, no more than three current-carrying conductors, and 0 ft route length entered.

What 50 A ChangesAt 50 A, the 75 C default result has no extra displayed ampacity above the 50 A load: 8 AWG copper and 6 AWG aluminum both show 50 A usable ampacity. Treat this as a short-run starting point, not a substitute for checking the marked termination temperature, continuous load, equipment instructions, and route length.

Run the wire size calculator

Adjacent Amp Ratings

See whether stepping one standard size up or down forces a conductor jump under the same defaults.

LoadCopper sizeCopper OCPDAluminum sizeAluminum OCPD
45 A8 AWG45 A6 AWG45 A
50 A (this page)8 AWG50 A6 AWG50 A
60 A6 AWG60 A4 AWG60 A
Copper and aluminum starting sizes for 50 A and the neighboring published amp pages, under the same defaults as the result above.

A plateau means neighboring amp ratings share a conductor size under these defaults. A jump means a standard breaker change often needs a larger wire; confirm with your real ambient, length and terminations.

50 A Sits Between Appliance Plateau and 60 A Jump

Appliance / mid branch context for a 50 A circuit.

A 50 A wire-size search commonly comes from ranges, welders, RV receptacles, spa packs, small shop loads, or EV charging plans. The trap is that the breaker handle may be known before the actual load duty cycle is known.

Under the displayed 75 C termination defaults, 50 A lands on 8 AWG copper or 6 AWG aluminum. That matches the 45 A page under these assumptions, while the adjacent 60 A page jumps to 6 AWG copper and 4 AWG aluminum. The site's common breaker chart uses larger 50 A pairings because terminal rating often governs in the field.

What Changes This Answer

Checks that can change the starting conductor under the displayed defaults.

  • Do not confuse 50 A with 48 A charging

    A 48 A EVSE setting is continuous and normally points to a 60 A circuit after the 125 percent step. Use this 50 A page only when the required circuit is actually 50 A.

  • Read the appliance or spa label

    Ranges, welders, RV equipment and spa packs can specify a circuit rating, GFCI method, conductor material or maximum overcurrent device. The label wins over a generic 50 A chart.

  • Confirm 75 C before using the direct answer

    The displayed 8 AWG copper and 6 AWG aluminum rows rely on 75 C terminations. If the equipment is limited to 60 C, use the calculator or common chart path before ordering wire.

  • Compare the 60 A jump

    Under these defaults, both materials move larger at 60 A. Do not assume a 50 A conductor result can be protected by a 60 A breaker.

50 Amp Wire Size FAQs

What size wire for 50 amps?
Under the 75 C termination defaults on this page, start with 8 AWG copper or 6 AWG aluminum. If the equipment must use the 60 C column, rerun the calculator or use the more conservative common chart pairing.
Is 50 A the same wire size as 45 A?
Under these displayed 75 C defaults, yes for the conductor labels: both pages show 8 AWG copper and 6 AWG aluminum. The load, overcurrent device, and allowed termination temperature are still separate checks.
Why does the common breaker chart show larger 50 A wire?
That chart uses common field pairings and flags terminal rating as the caution. This page shows the calculator's 75 C default result, so 60 C equipment can legitimately move the 50 A answer larger.
Can I use the 50 A answer for a 60 A breaker?
No. The adjacent 60 A page moves to 6 AWG copper and 4 AWG aluminum under the same defaults.
Is a 50 A circuit enough for a 48 A EV charger?
Not as a generic answer. EV charging is continuous, so a 48 A charge setting is sized at 125 percent and commonly lands on a 60 A circuit.