Colorado Electrician Journeyman Exam
Practice Questions With Correct
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Rationales 2026 Q&A | Instant
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1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To increase electrical sales
B. To provide minimum safety standards for electrical installations
C. To regulate utility companies
D. To reduce labor costs
Answer: B. To provide minimum safety standards for electrical
installations
Rationale: The NEC is designed to safeguard persons and property
from hazards arising from the use of electricity. It establishes
minimum standards for safe electrical design, installation, and
inspection.
2. Which NEC article covers grounding and bonding requirements?
A. Article 110
B. Article 210
,C. Article 250
D. Article 300
Answer: C. Article 250
Rationale: NEC Article 250 contains the requirements for grounding
and bonding electrical systems to reduce shock hazards and ensure
proper fault-current paths.
3. What is the minimum working clearance in front of a 120/240-volt
panelboard under normal conditions?
A. 24 inches
B. 30 inches
C. 36 inches
D. 48 inches
Answer: C. 36 inches
Rationale: NEC 110.26 requires a minimum working space depth of 36
inches for equipment operating at 0–150 volts to ground under
Condition 1.
4. What device protects against overloads and short circuits in a
branch circuit?
A. Transformer
B. Fuse or circuit breaker
C. Relay
D. Disconnect switch
,Answer: B. Fuse or circuit breaker
Rationale: Fuses and circuit breakers interrupt excessive current flow
caused by overloads or short circuits, protecting conductors and
equipment.
5. Which conductor is typically identified by white or gray insulation?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Neutral conductor
D. Traveler conductor
Answer: C. Neutral conductor
Rationale: NEC identifies grounded (neutral) conductors with white or
gray insulation to distinguish them from ungrounded conductors.
6. What is the ampacity of 12 AWG copper conductors under the
60°C column?
A. 15 amps
B. 20 amps
C. 25 amps
D. 30 amps
Answer: B. 20 amps
Rationale: According to NEC Table 310.16, 12 AWG copper conductors
are rated for 20 amps under the 60°C column.
, 7. Which type of outlet is required in residential bathrooms?
A. AFCI-protected outlet
B. GFCI-protected outlet
C. Isolated ground outlet
D. Twist-lock outlet
Answer: B. GFCI-protected outlet
Rationale: NEC requires Ground-Fault Circuit-Interrupter protection for
bathroom receptacles to reduce shock hazards in wet locations.
8. What does AFCI stand for?
A. Arc-Fault Circuit Interrupter
B. Alternating Fault Current Indicator
C. Automatic Fuse Control Interface
D. Arc Flash Current Isolation
Answer: A. Arc-Fault Circuit Interrupter
Rationale: AFCIs protect against electrical fires caused by arcing
conditions in branch-circuit wiring.
9. What is the minimum cover depth for direct-buried UF cable
under residential branch circuits rated 120 volts or less with GFCI
protection?
A. 6 inches
B. 12 inches
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 increase electrical sales
B. To provide minimum safety standards for electrical installations
C. To regulate utility companies
D. To reduce labor costs
Answer: B. To provide minimum safety standards for electrical
installations
Rationale: The NEC is designed to safeguard persons and property
from hazards arising from the use of electricity. It establishes
minimum standards for safe electrical design, installation, and
inspection.
2. Which NEC article covers grounding and bonding requirements?
A. Article 110
B. Article 210
,C. Article 250
D. Article 300
Answer: C. Article 250
Rationale: NEC Article 250 contains the requirements for grounding
and bonding electrical systems to reduce shock hazards and ensure
proper fault-current paths.
3. What is the minimum working clearance in front of a 120/240-volt
panelboard under normal conditions?
A. 24 inches
B. 30 inches
C. 36 inches
D. 48 inches
Answer: C. 36 inches
Rationale: NEC 110.26 requires a minimum working space depth of 36
inches for equipment operating at 0–150 volts to ground under
Condition 1.
4. What device protects against overloads and short circuits in a
branch circuit?
A. Transformer
B. Fuse or circuit breaker
C. Relay
D. Disconnect switch
,Answer: B. Fuse or circuit breaker
Rationale: Fuses and circuit breakers interrupt excessive current flow
caused by overloads or short circuits, protecting conductors and
equipment.
5. Which conductor is typically identified by white or gray insulation?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Neutral conductor
D. Traveler conductor
Answer: C. Neutral conductor
Rationale: NEC identifies grounded (neutral) conductors with white or
gray insulation to distinguish them from ungrounded conductors.
6. What is the ampacity of 12 AWG copper conductors under the
60°C column?
A. 15 amps
B. 20 amps
C. 25 amps
D. 30 amps
Answer: B. 20 amps
Rationale: According to NEC Table 310.16, 12 AWG copper conductors
are rated for 20 amps under the 60°C column.
, 7. Which type of outlet is required in residential bathrooms?
A. AFCI-protected outlet
B. GFCI-protected outlet
C. Isolated ground outlet
D. Twist-lock outlet
Answer: B. GFCI-protected outlet
Rationale: NEC requires Ground-Fault Circuit-Interrupter protection for
bathroom receptacles to reduce shock hazards in wet locations.
8. What does AFCI stand for?
A. Arc-Fault Circuit Interrupter
B. Alternating Fault Current Indicator
C. Automatic Fuse Control Interface
D. Arc Flash Current Isolation
Answer: A. Arc-Fault Circuit Interrupter
Rationale: AFCIs protect against electrical fires caused by arcing
conditions in branch-circuit wiring.
9. What is the minimum cover depth for direct-buried UF cable
under residential branch circuits rated 120 volts or less with GFCI
protection?
A. 6 inches
B. 12 inches
