WireGaugeCalc Free calculator · NEC cited · works offline
Speaker Page Wire Size Calculator
Speaker page wire size calculator is fast with WireGaugeCalc, since you enter the load amps, conductor material, and one-way run and it returns a gauge.
It checks the result against the NEC 310.16 ampacity table at the termination temperature you select, so the size matches how the breaker and lugs are rated.
You get a clear gauge in seconds, so you can pull the right conductor on the first trip.
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.
How the speaker and paging circuit gauge is sized
The tool reads ampacity from NEC 310.16, so a copper conductor and an aluminum conductor of the same gauge return different ratings.
It holds you to the termination temperature column your equipment is listed for, since lugs rated 60C cannot use the 90C value even with 90C insulation.
Inputs the calculator uses for a paging system run
Each field changes the gauge it recommends:
- Load current in amps drawn by the amplifier and zones
- Copper or aluminum conductor selection
- Termination temperature: 60C, 75C, or 90C column
- One-way run length so voltage drop stays in range
- Insulation type such as THHN or THWN
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
Does the calculator account for voltage drop on long paging runs?
Yes, it flags when the one-way length pushes drop past the 3% branch-circuit guideline so you can step up a size. A larger conductor lowers resistance, so the voltage at the far zone stays usable.
Which termination temperature should I pick for a speaker amplifier circuit?
Use the column your breaker and the amplifier terminals are listed for, which is often 75C on field equipment. Verify the listing on the device and confirm against the current NEC and your local authority having jurisdiction before you commit to a gauge.
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.