MasterElec

For 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 iPhone

Works offline. NEC 2020, 2023 and 2026.

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

Guides

Popular NEC guides

What size wire for 20 amps?

12 AWG copper, and why 14 AWG isn't allowed.

What size wire for 30 amps?

10 AWG copper, plus aluminum and the ground wire.

What size wire for 50 amps?

6 AWG copper, and when 8 AWG can work.

Keep the code in your pocket

Get answers on site, with or without signal.

Get MasterElec on iPhone