Kansas City, MO Low-Voltage Electrician Exam (ICC G21, 2017 NEC)

How to Pass the Kansas City, MO Low-Voltage Electrician (ICC G21, 2017 NEC) Exam

You don't have to guess how to prepare for the Kansas City, MO Low-Voltage Electrician (ICC G21, 2017 NEC) exam. This guide lays it out: the key facts from the official bulletin, the topics on the test, the books you need, sample questions with answers, and a study plan you can follow. Pearson VUE gives the exam.

Kansas City, MO Low-Voltage Electrician (ICC G21, 2017 NEC) Exam Basics

Here's what the official bulletin says about the exam:

On exam day

• Questions are four-option multiple choice with one correct answer.

References you may bring

• National Electrical Code (2017)
• Ugly’s Electrical References (any edition)

Scheduling, changes and retakes

• Exams are scheduled through Pearson VUE at www.pearsonvue.com/ICC.
• Results for electronically administered examinations are available immediately after the exam is completed.
• You must wait 10 days before retaking a failed exam.
• After passing, contact the jurisdiction for any other requirements needed to become licensed.

Source: Kansas City, Missouri Examination Information Bulletin (ICC Contractor/Trades), PUBLISHED November 10, 2025. Check the bulletin before test day: fees and rules can change.

What's on the Kansas City, MO Low-Voltage Electrician (ICC G21, 2017 NEC) Exam

The official content outline splits the exam into 5 topics:

Your Kansas City, MO Low-Voltage Electrician (ICC G21, 2017 NEC) Study Plan

Your books are your best friend on this exam. It's open book, so the references on the bulletin's list are what you'll use on test day. Get your own copies in the editions the bulletin names.

Get to know them early. Spend time with each book's table of contents and index until you can find any major subject quickly. On an open-book exam, finding answers fast is the skill that counts.

Make the books yours. Highlight the sections you keep coming back to. Check the bulletin's rules on tabs and markings before you add any.

Put your energy where the points are. LV Communications & Sound and General Knowledge make up 60% of the exam, so start there.

Practice with the clock running. Our timed practice exams help you build the pace the real exam needs: about 3 minutes 36 seconds per question. Every attempt is another rep.

Keep going until you pass practice exams consistently. One good score is a great start. A few passing scores in a row is how you know you're ready.

Books You'll Need for the Kansas City, MO Low-Voltage Electrician (ICC G21, 2017 NEC) Exam

The references listed for this open-book exam are the 2017 National Electrical Code and Ugly’s Electrical References (any edition).

Where to get them:

• NEC 2017
• Ugly's Electrical References 2023

Test Day Tips

Start with a quick pass through the whole exam. Answer every question you're sure about and bookmark the rest. Every exam lets you return to bookmarked questions, so nothing is lost by moving on. One catch: some exams lock the questions you've already seen once you take a break, so clear your bookmarks before any break.

Then come back to your bookmarks and work through them one at a time. Keep an eye on the clock: you have 3 hours for 50 questions, which is about 3 minutes 36 seconds per question. Before you finish, make sure every question has an answer. A blank can't earn a point.

Study Tips

Our practice exam is specifically designed to mimic the testing conditions at all exam centers. While untimed PDF study guides might help with studying, they don’t prepare you for the challenge of managing your time during an actual test.

Don't choose a word simply because it looks familiar. On difficult questions, you may not recognize several words in the answer choices—but that doesn't mean they're invented. Test writers only use real words. If you recognize the words in only one answer choice, focus on that choice and evaluate it carefully. If it's correct, great. If not, eliminate it. Every answer choice you eliminate improves your odds, even if you end up guessing among the remaining options.

Be alert to hedging words like likely, may, can, sometimes, usually, generally, and rarely—question writers use them to account for exceptions. An answer choice is often wrong simply because it allows no exceptions. Similarly, avoid choices containing absolute terms like exactly and always.

Know your way around each book's index and table of contents. Open-book exams reward speed: you need to find specific items quickly.

Skim the answer choices before you commit. You're hunting for the key term or vocabulary word that signals the right concept. The more you've practiced, the faster the right wording jumps out at you.

Try These Kansas City, MO Low-Voltage Electrician (ICC G21, 2017 NEC) Practice Questions

Give these a try. They come from our practice question bank, each with its answer and reference.

Sample 1 — LV Control Circuits

Question: A control circuit transformer serving a motor controller has a rated primary current of less than 2 amperes. An overcurrent device installed in the primary circuit is permitted to be rated or set at not more than what percent of the rated primary current?

• A. 300 percent
• B. 500 percent
• C. 167 percent
• D. 125 percent

Correct Answer: B

NEC 430.72(C)(4) permits an overcurrent device rated or set at not more than 500 percent of the rated primary current where the control circuit transformer rated primary current is less than 2 amperes. The 167 percent figure belongs to 725.41(A)(2) for non-transformer Class 1 power-limited sources.

Reference: NEC 2017 Section 430.72(C)(4)

Sample 2 — Fiber Optical

Question: Optical fibers contained within the same composite cable as conductors for electric light, power, Class 1, or non–power-limited fire alarm circuits operating at 1000 volts or less are permitted to be installed under what condition?

• A. The fibers and conductors have associated functions
• B. The composite cable is listed as a plenum type
• C. Only qualified persons service the installation
• D. A permanent barrier separates the conductors

Correct Answer: A

NEC 770.133(A) permits optical fibers within the same composite cable as electric light, power, Class 1, non–power-limited fire alarm, or medium-power network-powered broadband circuits at 1000 volts or less only where the functions of the optical fibers and the electrical conductors are associated.

Reference: NEC 2017 Section 770.133(A)

Sample 3 — LV Communications & Sound

Question: A building served by a CATV system has no intersystem bonding termination, so you connect the grounding electrode conductor to the grounded interior metal water piping system. The connection must be made within what distance of the piping system's point of entrance to the building?

• A. 10 ft
• B. 3 ft
• C. 20 ft
• D. 5 ft

Correct Answer: D

NEC 820.100(B)(2) permits connection to the grounded interior metal water piping system within 1.5 m (5 ft) from its point of entrance to the building. The 20 ft figure is the maximum bonding/grounding electrode conductor length at one- and two-family dwellings under 820.100(A)(4), not the water-pipe connection distance.

Reference: NEC 2017 Section 820.100(B)(2)

Sample 4 — General Knowledge

Question: Per NEC 300.4(E), what is the minimum clearance required between the lowest surface of metal-corrugated sheet roof decking and the top of a cable, raceway, or box installed underneath?

• A. 1 inch (25 mm)
• B. 2 inches (50 mm)
• C. 1¼ inches (32 mm)
• D. 1½ inches (38 mm)

Correct Answer: D

Per NEC 300.4(E), a cable, raceway, or box installed under metal-corrugated sheet roof decking shall be installed and supported so there is not less than 38 mm (1½ in.) measured from the lowest surface of the roof decking to the top of the cable, raceway, or box.

Reference: NEC 2017 Section 300.4(E)

Why Practice Online?

Reading questions in a PDF is a start, but it doesn't prepare you for the clock. Our practice exams are timed and on a screen, so you build speed along with knowledge. Each attempt draws a new set of questions from our bank, and your results show your score by topic so you know where to focus next.

Ready to Start?

Take the free Kansas City, MO Low-Voltage Electrician (ICC G21, 2017 NEC) practice exam and see where you stand today. Then focus on the topics that need the most work. For the official rules, read the exam bulletin, and see the licensing board's website.