WireGaugeCalc Free calculator · NEC cited · works offline
How Many Amps Can A 10 Gauge Wire Carry 200 Feet
How many amps can a 10 gauge wire carry 200 feet is fast to answer with WireGaugeCalc, which pulls the NEC ampacity and then checks the run length.
You enter the conductor material, the termination temperature, and the load, so the tool shows the table ampacity next to the voltage drop on 200 feet.
That way you see both the breaker limit and the real distance limit before you pull any wire.
Open the calculatorAllowable ampacity from NEC Table 310.16 at the chosen termination temperature. Field aid only, verify against the current NEC and your local authority having jurisdiction.
Ampacity Comes From The Table, The 200 Feet Comes From Voltage Drop
Per NEC 310.16, 10 AWG copper is rated 30 amps at the 60C column and 35 amps at the 75C column, but the small-conductor rule in 240.4(D) caps most 10 AWG branch circuits at 30 amps.
The table ampacity does not change with length, since it is about heat in the conductor, so 200 feet does not lower the amp rating itself.
What 200 feet changes is voltage drop, so the practical current you can run drops once the conductor gets long enough to push past the 3 percent guideline.
What WireGaugeCalc Checks On A 200 Foot 10 AWG Run
Enter the run and the tool reports the limits side by side:
- Table ampacity for 10 AWG copper at the chosen termination temperature
- The 30 amp branch-circuit cap from NEC 240.4(D) for 10 AWG
- Voltage drop across the full 200 foot path
- The amperage that keeps you inside the 3 percent drop guideline
- Copper versus aluminum so you can compare the same length
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 really carry 30 amps over 200 feet?
The conductor is rated for 30 amps no matter the length, but over 200 feet of copper the voltage drop at 30 amps often passes 3 percent on 120V. You may need to upsize the wire or lower the load to stay inside the drop guideline.
How much voltage drop will 10 AWG see at 200 feet?
On a 120V circuit, 10 AWG copper at about 20 amps over a 200 foot run lands near the 3 percent line, so heavier current drops more. WireGaugeCalc gives the exact percent for your load and voltage.
Is 30 amps the hard limit for 10 AWG?
For most terminations the 10 AWG branch circuit is held to 30 amps by NEC 240.4(D). Always verify the result against the current NEC and your local authority having jurisdiction before sizing the breaker.
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.