WireGaugeCalc Free calculator · NEC cited · works offline
How Many Amps Can No 2 Wire Handle
How many amps can no 2 wire handle is simple with WireGaugeCalc, since you set copper or aluminum and the termination temperature and it reads the NEC ampacity.
It pulls the value straight from NEC Table 310.16 for the column that matches your terminals.
That gives you the legal ampere rating for a No 2 AWG conductor without flipping through the book.
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.
No 2 AWG Ampacity By Material And Temperature
Copper No 2 carries more current than aluminum No 2, so the same conductor size lands on a different ampere value depending on the metal.
The 75C column applies to most terminal ratings, so the calculator defaults there unless your equipment is rated for 90C.
Reading The NEC 310.16 Ampacity
Ampacity is read from one column, since the lowest-rated termination in the circuit controls the value:
- Copper No 2 at 75C is rated 115 amps.
- Aluminum No 2 at 75C is rated 90 amps.
- The 90C column is used only for derating, not for the final terminal rating.
- Pick the column that matches your breaker and lug temperature rating.
- Bundling more than three current-carrying conductors lowers the usable ampacity.
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 I use the 90C value for No 2 wire?
Only as a starting point for adjustment and derating. The final ampacity must match the terminal temperature rating, which is usually 75C for breakers and lugs.
Does aluminum No 2 carry the same amps as copper?
No, aluminum No 2 carries less current than copper No 2 in the same temperature column. Always confirm the rating against the current NEC and your local authority having jurisdiction before final sizing.
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.