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ICC G21 Low-Voltage

International Code Council – Low-Voltage, 2017 NEC

The G21 Is a Specialist Exam. Your Prep Should Be Specialized Too.

Low-voltage work is its own discipline, and the G21 is the exam built specifically for it. MCL builds exclusively around the G21, so every hour you study counts towards your license.

Package Options

Choose the Product That Fits Your Needs

Every combo includes...

✓ Highlighting guides
✓ Audio tracks
✓ Digital study guides
✓ Quizzes for each book
✓ Book lookup exercises
✓ Unlimited practice exams
✓ Unlimited tutoring
✓ One-on-one coaching

Is this Your Exam?

G21

The G21 runs on the 2017 NEC and is currently accepted for Low-Voltage licensure in select jurisdictions. Check the jurisdiction guide to confirm whether your city or county requires it and which exam code they use locally.

Use Our Jurisdiction Guide →

Why Low-Voltage-Level Is Different

Low-voltage work is its own discipline with different systems, code sections, and day-to-day work. The G21 reflects that: it covers General Knowledge, LV Remove Control & Alarm Systems, LV Communications & Sound, LV Control Circuits, and Fiber Optical. Nothing outside that scope.

MCL's G21 Prep sticks exactly to that content. Every drill, practice exam, and codebook lookup is scoped to what's on your exam.

What's Included

Everything Built for Low-Voltage Prep

01

Pre-highlighted, pre-tabbed 2017 NEC

Arrive at your exam ready to navigate under time pressure.

02

Audio tracks for every book

Memorize the material without just rereading the same page.

03

Unlimited timed practice exams

By exam day, the format, the pacing, the pressure, none of it is new.

04

Timed book look-up drills

Train to find answers in seconds.

05

Scenario-based walkthroughs

Practice the on-the-job thinking the exam tests, so no question catches you off guard.

06

Unlimited 1-on-1 tutoring

You’ll never be stuck studying alone. Call or email, we pick up.]

07

Content updated to match real exams

What you’re studying always reflects codes and exams changes.

08

110% Money-Back Guarantee

Complete the program. Take the exam. If you don't pass, we’ll refund you more than you paid.

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FAQs

What You Need to Know

Is the G21 exam open book?

Yes. ICC's Contractor/Trades exams are open book. You can bring approved references into the exam. The official ICC exam catalog lists which references are approved for the G21 specifically. Knowing your codebook cold matters more than memorization.

What score do I need to pass?

Most ICC Contractor/Trades exams, including G21, require 70% of questions answered correctly to pass.

What happens if I don't pass?

Complete the MCL program, take the exam, and if you don't pass, we'll refund more than you paid — 110% of your prep course purchase. No other ICC exam prep in the market makes that promise. [See full guarantee terms →]

How long do I have access to the course?

365 days from your purchase date, giving you a full year to study at your pace, around your schedule.

I’m working full time. How do I fit this in?

MCL is built for working electricians. Audio tracks, mobile access, and self-paced lessons mean you can study on the drive, between jobs, or on the weekend. You don't have to stop working to get ready.

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