Colorado Master Electrician Exam
Practice Questions With Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To reduce labor costs
B. To provide minimum safety standards for electrical installations
C. To regulate utility companies
D. To replace local building codes
Answer: B. To provide minimum safety standards for electrical
installations
Rationale: The NEC is designed to safeguard persons and property from
electrical hazards by establishing minimum standards for safe electrical
installations.
2. According to the NEC, how often is the code typically updated?
,A. Every year
B. Every 2 years
C. Every 3 years
D. Every 5 years
Answer: C. Every 3 years
Rationale: The NEC is revised and published on a three-year cycle to
address technological advancements and evolving safety practices.
3. Which NEC article covers grounding and bonding requirements?
A. Article 110
B. Article 250
C. Article 300
D. Article 430
Answer: B. Article 250
Rationale: NEC Article 250 contains comprehensive rules for grounding
and bonding electrical systems and equipment.
4. What is the minimum working clearance in front of a 480-volt
panelboard under normal conditions?
A. 2 feet
B. 2.5 feet
C. 3 feet
D. 4 feet
Answer: C. 3 feet
,Rationale: NEC 110.26 requires at least 3 feet of working clearance for
equipment operating at 0–600 volts under typical conditions.
5. Which conductor is intentionally connected to earth ground?
A. Ungrounded conductor
B. Equipment grounding conductor
C. Grounded conductor
D. Traveler conductor
Answer: C. Grounded conductor
Rationale: The grounded conductor, commonly the neutral, is
intentionally connected to earth ground at the service equipment.
6. What type of current alternates direction periodically?
A. Direct current
B. Static current
C. Alternating current
D. Inductive current
Answer: C. Alternating current
Rationale: Alternating current changes direction cyclically and is the
standard form of electricity supplied to homes and businesses.
7. What instrument is used to measure electrical resistance?
A. Ammeter
B. Wattmeter
, C. Voltmeter
D. Ohmmeter
Answer: D. Ohmmeter
Rationale: An ohmmeter measures resistance in ohms and is commonly
included in multimeters.
8. Which formula represents Ohm’s Law?
A. P = EI
B. E = IR
C. R = P/I
D. I = EP
Answer: B. E = IR
Rationale: Ohm’s Law states that voltage equals current multiplied by
resistance.
𝐸 = 𝐼𝑅
9. A 20-amp branch circuit supplying continuous loads must have a
maximum continuous load of:
A. 16 amps
B. 18 amps
C. 20 amps
D. 25 amps
Answer: A. 16 amps
Practice Questions With Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To reduce labor costs
B. To provide minimum safety standards for electrical installations
C. To regulate utility companies
D. To replace local building codes
Answer: B. To provide minimum safety standards for electrical
installations
Rationale: The NEC is designed to safeguard persons and property from
electrical hazards by establishing minimum standards for safe electrical
installations.
2. According to the NEC, how often is the code typically updated?
,A. Every year
B. Every 2 years
C. Every 3 years
D. Every 5 years
Answer: C. Every 3 years
Rationale: The NEC is revised and published on a three-year cycle to
address technological advancements and evolving safety practices.
3. Which NEC article covers grounding and bonding requirements?
A. Article 110
B. Article 250
C. Article 300
D. Article 430
Answer: B. Article 250
Rationale: NEC Article 250 contains comprehensive rules for grounding
and bonding electrical systems and equipment.
4. What is the minimum working clearance in front of a 480-volt
panelboard under normal conditions?
A. 2 feet
B. 2.5 feet
C. 3 feet
D. 4 feet
Answer: C. 3 feet
,Rationale: NEC 110.26 requires at least 3 feet of working clearance for
equipment operating at 0–600 volts under typical conditions.
5. Which conductor is intentionally connected to earth ground?
A. Ungrounded conductor
B. Equipment grounding conductor
C. Grounded conductor
D. Traveler conductor
Answer: C. Grounded conductor
Rationale: The grounded conductor, commonly the neutral, is
intentionally connected to earth ground at the service equipment.
6. What type of current alternates direction periodically?
A. Direct current
B. Static current
C. Alternating current
D. Inductive current
Answer: C. Alternating current
Rationale: Alternating current changes direction cyclically and is the
standard form of electricity supplied to homes and businesses.
7. What instrument is used to measure electrical resistance?
A. Ammeter
B. Wattmeter
, C. Voltmeter
D. Ohmmeter
Answer: D. Ohmmeter
Rationale: An ohmmeter measures resistance in ohms and is commonly
included in multimeters.
8. Which formula represents Ohm’s Law?
A. P = EI
B. E = IR
C. R = P/I
D. I = EP
Answer: B. E = IR
Rationale: Ohm’s Law states that voltage equals current multiplied by
resistance.
𝐸 = 𝐼𝑅
9. A 20-amp branch circuit supplying continuous loads must have a
maximum continuous load of:
A. 16 amps
B. 18 amps
C. 20 amps
D. 25 amps
Answer: A. 16 amps
