ELECTRICAL CONTRACTOR EXAM |VERIFIED QUESTIONS
AND ANSWERS | GRADED A+ | GUARANTEED PASS | LATEST
2026
1. Which NEC Article covers general requirements for wiring methods?
A. Article 100
B. Article 200
C. Article 300
D. Article 400
Correct Answer: C. Article 300
Article 300 contains the general requirements for wiring methods and installations.
2. What is the minimum burial depth for rigid metal conduit (RMC) under a residential
driveway?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Correct Answer: B. 12 inches
NEC allows 12 inches for RMC under residential driveways.
3. What color insulation is used for grounded (neutral) conductors?
A. Green
B. Red
C. White or gray
D. Black
Correct Answer: C. White or gray
NEC requires grounded conductors to be identified by white or gray insulation.
4. What device protects against ground faults?
A. AFCI
B. GFCI
,C. Circuit breaker
D. Fuse
Correct Answer: B. GFCI
Ground-Fault Circuit Interrupters protect people from electric shock.
5. What is the maximum allowable voltage drop for branch circuits?
A. 2%
B. 3%
C. 5%
D. 10%
Correct Answer: B. 3%
NEC recommends a maximum of 3% voltage drop for branch circuits.
6. Which NEC article covers grounding and bonding?
A. Article 110
B. Article 200
C. Article 250
D. Article 300
Correct Answer: C. Article 250
Article 250 contains grounding and bonding requirements.
7. What type of conductor insulation is rated for wet locations?
A. THHN
B. THW
C. NM
D. TW
Correct Answer: B. THW
THW insulation is approved for wet locations.
8. What is the minimum working clearance in front of electrical panels (up to 150V)?
A. 24 inches
B. 30 inches
, C. 36 inches
D. 48 inches
Correct Answer: C. 36 inches
NEC requires a minimum of 36 inches of clear working space.
9. What size copper conductor is required for a 20-amp circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Correct Answer: B. 12 AWG
12 AWG copper is rated for 20 amps.
10. What is the purpose of bonding?
A. To limit voltage drop
B. To reduce resistance
C. To ensure electrical continuity
D. To increase load capacity
Correct Answer: C. To ensure electrical continuity
Bonding connects metal parts to prevent shock hazards.
11. Which device protects against arc faults?
A. GFCI
B. Fuse
C. AFCI
D. Disconnect
Correct Answer: C. AFCI
Arc-Fault Circuit Interrupters reduce fire hazards.
12. What is the maximum number of conductors allowed in a single EMT conduit (size
dependent)?
AND ANSWERS | GRADED A+ | GUARANTEED PASS | LATEST
2026
1. Which NEC Article covers general requirements for wiring methods?
A. Article 100
B. Article 200
C. Article 300
D. Article 400
Correct Answer: C. Article 300
Article 300 contains the general requirements for wiring methods and installations.
2. What is the minimum burial depth for rigid metal conduit (RMC) under a residential
driveway?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Correct Answer: B. 12 inches
NEC allows 12 inches for RMC under residential driveways.
3. What color insulation is used for grounded (neutral) conductors?
A. Green
B. Red
C. White or gray
D. Black
Correct Answer: C. White or gray
NEC requires grounded conductors to be identified by white or gray insulation.
4. What device protects against ground faults?
A. AFCI
B. GFCI
,C. Circuit breaker
D. Fuse
Correct Answer: B. GFCI
Ground-Fault Circuit Interrupters protect people from electric shock.
5. What is the maximum allowable voltage drop for branch circuits?
A. 2%
B. 3%
C. 5%
D. 10%
Correct Answer: B. 3%
NEC recommends a maximum of 3% voltage drop for branch circuits.
6. Which NEC article covers grounding and bonding?
A. Article 110
B. Article 200
C. Article 250
D. Article 300
Correct Answer: C. Article 250
Article 250 contains grounding and bonding requirements.
7. What type of conductor insulation is rated for wet locations?
A. THHN
B. THW
C. NM
D. TW
Correct Answer: B. THW
THW insulation is approved for wet locations.
8. What is the minimum working clearance in front of electrical panels (up to 150V)?
A. 24 inches
B. 30 inches
, C. 36 inches
D. 48 inches
Correct Answer: C. 36 inches
NEC requires a minimum of 36 inches of clear working space.
9. What size copper conductor is required for a 20-amp circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Correct Answer: B. 12 AWG
12 AWG copper is rated for 20 amps.
10. What is the purpose of bonding?
A. To limit voltage drop
B. To reduce resistance
C. To ensure electrical continuity
D. To increase load capacity
Correct Answer: C. To ensure electrical continuity
Bonding connects metal parts to prevent shock hazards.
11. Which device protects against arc faults?
A. GFCI
B. Fuse
C. AFCI
D. Disconnect
Correct Answer: C. AFCI
Arc-Fault Circuit Interrupters reduce fire hazards.
12. What is the maximum number of conductors allowed in a single EMT conduit (size
dependent)?
