WireGaugeCalc Free calculator · NEC cited · works offline
600 Amp Wire Size
600 amp wire size is fast with WireGaugeCalc, since the app reads NEC 310.16 ampacity to match the conductor to the load.
You set copper or aluminum and the termination temperature column, and it returns the conductor or parallel set that carries 600 amps.
That means you size the feeder correctly before you order the cable.
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.
Sizing 600 Amp Wire By Ampacity
A single conductor rarely carries 600 amps, so the app usually returns parallel sets sized from NEC 310.16.
Copper and aluminum read different ampacities, which changes the conductor or the number of parallel runs.
The 75C column is the usual termination rating, so the calculator sizes 600 amp wire to that value unless your equipment differs.
What Drives The 600 Amp Conductor Choice
To size 600 amp wire, the calculator weighs:
- Conductor material, since aluminum needs a larger size than copper
- Termination temperature column, usually 75C at the lugs
- Whether conductors run in parallel sets
- Ambient temperature and conductor count derating
- The matching NEC 310.16 ampacity for the feeder
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 one conductor carry 600 amps?
Large copper such as 1500 kcmil approaches that ampacity at 75C, but most 600 amp feeders use parallel sets for easier handling. Verify the chosen size against the current NEC and your local authority having jurisdiction.
Why does aluminum need a bigger 600 amp wire?
Aluminum has lower ampacity per size than copper, so it takes a larger conductor or more parallel runs to carry the same 600 amps.
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.