WireGaugeCalc Free calculator · NEC cited · works offline
10 Guage Wire 240v Amps
10 guage wire 240v amps is simple with WireGaugeCalc, since it pulls the NEC 310.16 ampacity for 10 AWG and shows what the breaker can be on a 240 volt circuit.
You enter the conductor material and the terminal temperature rating, and it returns the rated amps along with the matching overcurrent device size.
That gives you a clear answer so you can size the circuit without flipping through the table by hand.
Open the calculatorSmallest conductor whose ampacity meets the load, NEC Table 310.16. Field aid only, verify against the current NEC and your local authority having jurisdiction.
What 10 AWG carries at 240 volts
Copper 10 AWG is rated 30 amps at the 60 and 75 degree columns of NEC 310.16, so a 240 volt circuit on 10 AWG copper is typically protected at 30 amps.
Aluminum 10 AWG is rated 25 amps, since aluminum has lower conductivity, so the wire size calculator drops the breaker accordingly.
Voltage does not change ampacity, so 10 AWG carries the same amps at 240 volts as it does at 120 volts.
Sizing a 30 amp 240v circuit on 10 AWG
The calculator checks these factors before it confirms the amps:
- Conductor material, copper or aluminum
- Termination temperature, usually 60 or 75 degrees C
- NEC 310.16 base ampacity for 10 AWG
- Breaker size that matches the rated amps
- Whether the load is continuous and needs 125 percent
One app for every NEC calculation
WireGaugeCalc keeps the calculations you reach for most in one place:
- Voltage drop and wire sizing for any run
- Conduit fill for EMT, PVC, and RMC
- Box fill and junction box sizing
- Ampacity and temperature derating
- Motor circuit and load calculations
- Conduit bend offsets and saddles
Built for the field, works offline
The whole app runs on your phone, so it keeps working in a basement, an attic, or a job site with no signal.
There is no account to create and nothing to load. Open it, run the number, and get back to work.
- No signup and no signal needed
- Answers in a tap, not a spreadsheet
- Same tool on phone, tablet, and desktop
Every result cites the NEC article
Each answer shows the table or formula it came from, so you can check the method and learn the code as you go.
That makes the app useful on the job and during exam prep, since the reasoning is right next to the number.
Switch the code year your job runs on
Jurisdictions adopt the NEC at different times, so you can match the calculation to the code in force:
- NEC 2017, 2020, and 2023 tables
- Copper and aluminum conductors
- 60, 75, and 90 degree C terminations
- Single-phase and three-phase systems
Run the number, then get back to work
Stop flipping through a paper book or hopping between calculator sites. Enter your values, read the code-cited answer, and move on. Free to use, no signup.
Open the calculatorFrequently asked questions
Can 10 gauge wire handle a 30 amp 240v breaker?
Yes, 10 AWG copper is rated 30 amps at the 60 and 75 degree columns, so it pairs with a 30 amp breaker for a 240 volt circuit. Confirm the load does not exceed 24 amps if it runs continuously.
Why is aluminum 10 AWG only good for 25 amps?
Aluminum carries less current than copper for the same size, so NEC 310.16 rates 10 AWG aluminum at 25 amps. The wire size calculator lowers the breaker to match.
Does the 240 volt rating change the wire size I need?
No, ampacity is set by the conductor and temperature, not the voltage, so amps stay the same at 240 volts. Always verify the final sizing against the current NEC and your local authority having jurisdiction.
Is WireGaugeCalc free to use?
Yes. Every calculator is free to run with no signup. A paid tier adds saved projects, PDF reports, and extra code years, but the core math stays free.
Does it work without internet?
Yes. The app runs on your device, so it keeps working with no signal on a job site, in a basement, or in an attic.
Are the results code accurate?
Results follow published NEC tables and standard formulas, and each answer shows the article it came from. It is a field aid, not a stamp of approval, so verify against the current code and your local authority before you wire anything.
Which NEC code year does it use?
You can switch between NEC 2017, 2020, and 2023, since jurisdictions adopt the code at different times. Pick the year your job runs on.