Kansas City, MO Low-Voltage Electrician Exam (ICC G21, 2017 NEC) Practice Exam
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Kansas City, MO Low-Voltage Electrician (ICC G21, 2017 NEC) Practice Exam Guide
What's on the exam
Questions per topic, out of 50This practice exam is built around the official content outline for the Kansas City, MO Low-Voltage Electrician (ICC G21, 2017 NEC) exam: General Knowledge, LV Remote Control & Alarm Systems, LV Communications & Sound, LV Control Circuits, Fiber Optical.
There are two ways to practice. The free practice exam gives you 10 questions per attempt, and you can take it as many times as you like. The full practice exam gives you 50 questions on a 3 hours clock, with a new draw from our question bank each time.
General Knowledge 12 items
Our study plan for this topic: Ohm's Law and power formulas (P, E, I, R relationships); Series, parallel, and combination circuit calculations; AC circuit concepts: impedance, reactance, inductance, and capacitance; Electrical formulas for amperes, kilowatts, kVA, and horsepower (single-phase and three-phase); Grounding and bonding principles and terminology (NEC Article 250); NEC code structure, scope, definitions, and general installation requirements; Power factor, power factor correction, and efficiency calculations; Electrical symbols, field terms vs. NEC terms, and units of measurement/conversion.
LV Remote Control & Alarm Systems 11 items
Our study plan for this topic: Class 1 vs. Class 2 vs. Class 3 circuit classifications and definitions; Power source requirements for Class 2 and Class 3 circuits; Class 1 circuit overcurrent protection and conductor sizing; Separation of Class 2/Class 3 circuits from power and Class 1 conductors; Cable types and substitution hierarchy for Class 2, Class 3, and PLTC cables; Fire alarm circuit classifications: NPLFA vs. PLFA; Power source and branch circuit requirements for fire alarm systems; Fire alarm cable types, listing requirements, and installation by building location.
LV Communications & Sound 18 items
Our study plan for this topic: Communications cable types and listing requirements (CMP, CMR, CMG, CM, CMX, CMUC); Cable installation locations — plenums, risers, and general-purpose spaces (Article 800); Grounding and bonding of communications cables and primary protectors (Article 800); Primary and secondary protectors — application, location, and types; CATV coaxial cable types, installation, and grounding of outer conductive shield (Article 820); Network-powered broadband communications systems — power classifications, cable types, and installation (Article 830); Audio signal processing and reproduction equipment — wiring methods, grounding, and loudspeaker installation (Article 640); Radio and television antenna systems — materials, clearances, discharge units, and bonding conductors (Article 810).
LV Control Circuits 7 items
Our study plan for this topic: Motor control circuit overcurrent protection and conductor sizing (NEC 430.72); Electrical arrangement and grounding of control circuits (NEC 430.74); Disconnection of motor control circuits from all power sources (NEC 430.75); Class 1 vs. Class 2 vs. Class 3 remote-control circuit classifications and power source requirements; Three-wire stop-start station wiring and seal-in contact operation; Multiple stop-start stations and hand-off-automatic (HOA) control circuit configurations; Jogging circuits and control relay wiring for inching operations; Control circuit transformer protection and reduced-voltage control wiring methods.
Fiber Optical 2 items
Our study plan for this topic: Optical fiber cable types and listing requirements (OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, OFC); Installation locations within buildings (plenums, risers, general spaces, cable trays); Grounding and bonding of metallic members of optical fiber cables; Separation requirements when installed with electrical conductors; Overhead and underground optical fiber cables entering buildings; Cable substitution hierarchy for optical fiber cable types; Abandoned optical fiber cable requirements and fire spread prevention; Unlisted optical fiber cables entering buildings (50 ft rule, raceway requirements).
Sample 1 — LV Communications & Sound
Question: When the maximum system current (Imax) and maximum volt-ampere output (VAmax) of a network-powered broadband communications power source are determined, those limits apply after what period of operation?
- A. 3 minutes
- B. 15 minutes
- C. 1 minute
- D. 10 seconds
Correct Answer: C
Note 1 to NEC Table 830.15 defines Imax and VAmax with the current-limiting impedance in the circuit (not bypassed) and states that the Imax limits apply after 1 minute of operation and that VAmax is the maximum volt-ampere output after 1 minute of operation.
Reference: NEC 2017 Table 830.15, Note 1
Sample 2 — General Knowledge
Question: When ungrounded supply conductors are larger than 1,100 kcmil copper or 1,750 kcmil aluminum, the grounded conductor or bonding jumper shall have an area not less than _ percent of the area of the largest ungrounded supply conductor.
- A. 10
- B. 12.5
- C. 15
- D. 20
Correct Answer: B
Per NEC Table 250.102(C)(1) (reproduced in the reference material), Note 1 states: 'If the ungrounded supply conductors are larger than 1100 kcmil copper or 1750 kcmil aluminum, the grounded conductor or bonding jumper shall have an area not less than 12½ percent of the area of the largest ungrounded supply conductor or equivalent area for parallel supply conductors.'
Reference: NEC 2017 Section 250.102(C)
Sample 3 — LV Remote Control & Alarm Systems
Question: Which cable type is a permitted substitution for Type FPL power-limited fire alarm cable?
- A. CL3P
- B. PLTC
- C. NPLF
- D. FPLR
Correct Answer: D
Table 760.154(A) permits Types CMP, FPLP, CMR, FPLR, CMG, and CM as substitutions for Type FPL. Non–power-limited (NPLF), power-limited tray cable (PLTC), and Class 3 plenum (CL3P) cables are not listed substitutions for fire alarm FPL cable.
Reference: NEC 2017 Table 760.154(A)
Your first score is just a starting point. After every attempt, the results page shows how you did on each outline topic, so you can see what to work on next. Compare your score with the real exam's passing score, a minimum score of 70, and keep at it until you pass consistently.
- Start with the questions you know. Go through the whole exam once and bookmark anything you're unsure about. Our practice exams let you bookmark and come back.
- Circle back to your bookmarks on the second pass.
- Keep an eye on your pace. The real exam works out to about 3 minutes 36 seconds per question.
- Turn every miss into a lesson. After each attempt, look up each missed question's reference in your book and read the section.
| Questions | 50 questions |
| Time limit | 3 hours |
| Passing score | a minimum score of 70 |
| Books in the exam room | Open book |
| Exam fee | $115 |
- Results for electronically administered examinations are available immediately after the exam is completed.
- You must wait 10 days before retaking a failed exam.
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.