MasterElecFor electricians on the job
NEC answers, even with no signal
Ask out loud and get the answer with the code section, right on your iPhone.
Get MasterElec on iPhoneWorks offline. NEC 2020, 2023 and 2026.
What size wire for 20 amps?
12 AWG copper14 AWG isn't permitted on a 20-amp breaker.
NEC 2023 · Table 310.16 · 240.4(D)
NEC 2023 · Table 310.16 · 240.4(D)
Why MasterElec
Built for the job site
The code answer you need, without digging through the book.
Hands-free
Tap the mic and ask your question out loud.
Works offline
Basements, new builds and dead zones are no problem.
Your edition
Choose NEC 2020, 2023 or 2026 to match your job.
How it works
Ask. Get the section. Move on.
1
Ask
Say your question the way you'd ask a coworker.
2
Get the answer
See the result with the NEC section it comes from.
3
Run the numbers
Use the calculators, then export a PDF report.
Wire sizeVoltage dropAmpacityConduit fillBox fillGrounding conductor
Keep the code in your pocket
Get answers on site, with or without signal.
Get MasterElec on iPhone