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What Size Wire for 110 Amps?

For 110 amps with the displayed 75 C termination defaults, start with 2 AWG copper or 1/0 AWG aluminum. This is the first page after 100 A where both conductor materials move larger.
Load
110 A
Distance
0 ft entered
Band
Feeder / subpanel
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
Copper2 AWG110 A115 ATermination rated 75 CPasses defaults
Aluminum1/0 AWG110 A120 ATermination rated 75 CPasses defaults
What Size Wire for 110 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 110 A ChangesAt 110 A, both conductor materials just moved larger from the 100 A page. Copper shows 115 A usable ampacity and aluminum shows 120 A under the displayed 75 C defaults, but terminal rating, feeder length, derating, and the load calculation can still force the next conductor.

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
100 A3 AWG100 A1 AWG100 A
110 A (this page)2 AWG110 A1/0 AWG110 A
125 A1 AWG125 A2/0 AWG125 A
Copper and aluminum starting sizes for 110 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.

110 A Is the Step Above a 100 A Feeder

Feeder / subpanel context for a 110 A circuit.

A 110 A wire-size search usually means the planned feeder or equipment rating sits just above a common 100 A decision. That can be a shop feeder, garage subfeed, listed equipment feeder, or a load-managed addition where the actual rating is not meant to round down to 100 A.

Under the displayed 75 C termination defaults, copper moves from 3 AWG at 100 A to 2 AWG here, and aluminum moves from 1 AWG to 1/0 AWG. The next 125 A page moves both materials again, so 110 A is a narrow step rather than a broad shortcut between 100 A and 125 A.

What Changes This Answer

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

  • Do not reuse the 100 A conductors

    Under these defaults, 100 A uses 3 AWG copper and 1 AWG aluminum. This 110 A page moves to 2 AWG copper and 1/0 AWG aluminum.

  • Confirm the actual 110 A requirement

    A 110 A conductor answer assumes 110 A is the correct feeder or equipment rating. Use the load calculation, equipment instructions, and overcurrent device rating before selecting wire.

  • Check marked terminal temperature

    The direct answer assumes 75 C terminations. If either end is limited to 60 C, rerun the calculator with that terminal rating before relying on the displayed result.

  • Compare 125 A before standardizing

    The adjacent 125 A page moves both copper and aluminum larger again under the same defaults.

  • Plan the full feeder

    Subpanel feeders also need neutral sizing, equipment grounding conductor sizing, raceway fill, lug listing, and voltage drop checks.

110 Amp Wire Size FAQs

What size wire for 110 amps?
Under the 75 C termination defaults on this page, start with 2 AWG copper or 1/0 AWG aluminum. Rerun the calculator for 60 C terminals, long feeders, derating, or a continuous-load case.
Can I use 100 A wire for a 110 A feeder?
No under these displayed defaults. The 100 A page shows 3 AWG copper and 1 AWG aluminum, while 110 A moves to 2 AWG copper and 1/0 AWG aluminum.
Is 110 A close enough to use the 125 A answer?
Use the conductor and overcurrent rating that match the actual load and equipment. The 125 A page is larger for both materials under these defaults, so it is a different feeder decision.
Does aluminum make sense for a 110 A feeder?
Often yes, especially on longer feeders, but the conductor and equipment lugs must be listed for aluminum and installed to the required torque and termination instructions.