Indiana Electrical Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which type of conductor insulation is rated for wet locations?
A. NM-B
B. THWN
C. UF-B
D. SE
Answer: THWN
Rationale: THWN insulation is rated for wet and dry locations, making it
suitable for conduit runs exposed to moisture.
2. What is the maximum number of conductors allowed in a 3/4-inch
EMT conduit, 90°C conductors?
A. 9
B. 10
C. 12
D. 8
Answer: 10
Rationale: According to NEC Chapter 9, Table 1 and Annex C, 10 conductors
of 90°C insulation can fit in a 3/4-inch EMT conduit without exceeding fill
limits.
3. A single-phase 120/240V service has a 200A main breaker. What is the
minimum wire size for the service conductors?
, A. 2/0 AWG
B. 3/0 AWG
C. 4/0 AWG
D. 1/0 AWG
Answer: 3/0 AWG
Rationale: NEC Table 310.16 specifies that 3/0 copper conductors with 75°C
insulation are rated for 200A.
4. Which device provides protection against ground faults?
A. Circuit breaker
B. Fuse
C. GFCI
D. Contactor
Answer: GFCI
Rationale: Ground Fault Circuit Interrupters (GFCIs) detect current leakage to
ground and trip the circuit, protecting against electrical shock.
5. The minimum height for service conductors above a residential
driveway is:
A. 12 feet
B. 14 feet
C. 18 feet
D. 20 feet
Answer: 18 feet
Rationale: NEC 230.24 requires at least 18 feet clearance over driveways for
overhead service conductors.
6. What type of wiring method is required for a damp location?
A. NM-B
B. MC or AC
C. UF-B
D. Nonmetallic tubing
, Answer: MC or AC
Rationale: Metal-clad (MC) or Armored Cable (AC) are suitable for damp
locations, while NM-B is only for dry locations.
7. What is the NEC maximum distance between supports for 1-inch PVC
conduit?
A. 6 feet
B. 10 feet
C. 8 feet
D. 12 feet
Answer: 10 feet
Rationale: NEC 352.30 specifies that 1-inch PVC conduit must be supported
every 10 feet.
8. Which type of overcurrent protection device is used for motor branch
circuits?
A. GFCI
B. Circuit breaker or fuse
C. Contactor
D. Relay
Answer: Circuit breaker or fuse
Rationale: Motor branch circuits require overcurrent protection rated for
motor starting currents, typically via breakers or fuses.
9. What is the minimum ampacity for a feeder supplying a dwelling with
a calculated load of 150A?
A. 125A
B. 150A
C. 175A
D. 200A
Answer: 150A
Rationale: The feeder must be sized for the calculated load without reducing
below the actual calculated amperage.
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which type of conductor insulation is rated for wet locations?
A. NM-B
B. THWN
C. UF-B
D. SE
Answer: THWN
Rationale: THWN insulation is rated for wet and dry locations, making it
suitable for conduit runs exposed to moisture.
2. What is the maximum number of conductors allowed in a 3/4-inch
EMT conduit, 90°C conductors?
A. 9
B. 10
C. 12
D. 8
Answer: 10
Rationale: According to NEC Chapter 9, Table 1 and Annex C, 10 conductors
of 90°C insulation can fit in a 3/4-inch EMT conduit without exceeding fill
limits.
3. A single-phase 120/240V service has a 200A main breaker. What is the
minimum wire size for the service conductors?
, A. 2/0 AWG
B. 3/0 AWG
C. 4/0 AWG
D. 1/0 AWG
Answer: 3/0 AWG
Rationale: NEC Table 310.16 specifies that 3/0 copper conductors with 75°C
insulation are rated for 200A.
4. Which device provides protection against ground faults?
A. Circuit breaker
B. Fuse
C. GFCI
D. Contactor
Answer: GFCI
Rationale: Ground Fault Circuit Interrupters (GFCIs) detect current leakage to
ground and trip the circuit, protecting against electrical shock.
5. The minimum height for service conductors above a residential
driveway is:
A. 12 feet
B. 14 feet
C. 18 feet
D. 20 feet
Answer: 18 feet
Rationale: NEC 230.24 requires at least 18 feet clearance over driveways for
overhead service conductors.
6. What type of wiring method is required for a damp location?
A. NM-B
B. MC or AC
C. UF-B
D. Nonmetallic tubing
, Answer: MC or AC
Rationale: Metal-clad (MC) or Armored Cable (AC) are suitable for damp
locations, while NM-B is only for dry locations.
7. What is the NEC maximum distance between supports for 1-inch PVC
conduit?
A. 6 feet
B. 10 feet
C. 8 feet
D. 12 feet
Answer: 10 feet
Rationale: NEC 352.30 specifies that 1-inch PVC conduit must be supported
every 10 feet.
8. Which type of overcurrent protection device is used for motor branch
circuits?
A. GFCI
B. Circuit breaker or fuse
C. Contactor
D. Relay
Answer: Circuit breaker or fuse
Rationale: Motor branch circuits require overcurrent protection rated for
motor starting currents, typically via breakers or fuses.
9. What is the minimum ampacity for a feeder supplying a dwelling with
a calculated load of 150A?
A. 125A
B. 150A
C. 175A
D. 200A
Answer: 150A
Rationale: The feeder must be sized for the calculated load without reducing
below the actual calculated amperage.
