CT Limited Electrical Contractor (E-3)
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales Q&A| Instant Download Pdf
1. What is the minimum size copper equipment grounding conductor for
a 40-amp branch circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Rationale: NEC Table 250.122 requires 10 AWG copper grounding
conductor for a 40-amp OCPD.
2. Which NEC article governs grounding and bonding?
A. 210
B. 230
C. 250
D. 430
Rationale: Article 250 covers grounding and bonding requirements for
electrical systems.
3. Maximum number of 90° bends allowed in a single conduit run
between pull points?
A. Two
B. Three
,C. Four
D. Five
Rationale: NEC limits total bends to 360°, equal to four 90° bends.
4. Minimum burial depth for PVC conduit under residential driveway?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Rationale: PVC under driveways requires 24 inches per NEC 300.5.
5. A 20-amp small appliance branch circuit must supply outlets in which
area?
A. Living room
B. Kitchen countertops
C. Bedroom
D. Laundry
Rationale: NEC 210.11(C)(1) requires 20-amp circuits for kitchen small
appliances.
6. Minimum height for service drop conductors above residential
sidewalks?
A. 8 ft
B. 10 ft
C. 12 ft
D. 14 ft
Rationale: NEC 230.24(B) requires 12 ft above sidewalks.
7. Which conductor is permitted to be bare?
A. Neutral
B. Equipment grounding conductor
C. Ungrounded conductor
D. Service conductor
, Rationale: Bare conductors may be used only for equipment grounding.
8. What is the minimum rating for a disconnecting means for a
residential AC condensing unit?
A. 10 amps
B. 20 amps
C. 30 amps
D. 60 amps
Rationale: Most units require ≥30A disconnect; NEC 440 requires
nameplate compliance.
9. Receptacles in bathrooms must be protected by which device?
A. AFCI
B. GFCI
C. Surge protector
D. Isolation transformer
Rationale: NEC 210.8(A) requires GFCI in bathrooms.
10. Maximum cord length for a garbage disposal?
A. 2 ft
B. 3 ft
C. 4 ft D. 6 ft
Rationale: NEC 422.16(B)(1) limits disposal cords to 36–48 inches.
11. Minimum service entrance conductor rating for a 100-amp
residential service?
A. 6 AWG Cu
B. 4 AWG Cu
C. 2 AWG Cu
D. 1/0 Cu
Rationale: NEC 310.12 requires 4 AWG copper for 100A services.
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales Q&A| Instant Download Pdf
1. What is the minimum size copper equipment grounding conductor for
a 40-amp branch circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Rationale: NEC Table 250.122 requires 10 AWG copper grounding
conductor for a 40-amp OCPD.
2. Which NEC article governs grounding and bonding?
A. 210
B. 230
C. 250
D. 430
Rationale: Article 250 covers grounding and bonding requirements for
electrical systems.
3. Maximum number of 90° bends allowed in a single conduit run
between pull points?
A. Two
B. Three
,C. Four
D. Five
Rationale: NEC limits total bends to 360°, equal to four 90° bends.
4. Minimum burial depth for PVC conduit under residential driveway?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Rationale: PVC under driveways requires 24 inches per NEC 300.5.
5. A 20-amp small appliance branch circuit must supply outlets in which
area?
A. Living room
B. Kitchen countertops
C. Bedroom
D. Laundry
Rationale: NEC 210.11(C)(1) requires 20-amp circuits for kitchen small
appliances.
6. Minimum height for service drop conductors above residential
sidewalks?
A. 8 ft
B. 10 ft
C. 12 ft
D. 14 ft
Rationale: NEC 230.24(B) requires 12 ft above sidewalks.
7. Which conductor is permitted to be bare?
A. Neutral
B. Equipment grounding conductor
C. Ungrounded conductor
D. Service conductor
, Rationale: Bare conductors may be used only for equipment grounding.
8. What is the minimum rating for a disconnecting means for a
residential AC condensing unit?
A. 10 amps
B. 20 amps
C. 30 amps
D. 60 amps
Rationale: Most units require ≥30A disconnect; NEC 440 requires
nameplate compliance.
9. Receptacles in bathrooms must be protected by which device?
A. AFCI
B. GFCI
C. Surge protector
D. Isolation transformer
Rationale: NEC 210.8(A) requires GFCI in bathrooms.
10. Maximum cord length for a garbage disposal?
A. 2 ft
B. 3 ft
C. 4 ft D. 6 ft
Rationale: NEC 422.16(B)(1) limits disposal cords to 36–48 inches.
11. Minimum service entrance conductor rating for a 100-amp
residential service?
A. 6 AWG Cu
B. 4 AWG Cu
C. 2 AWG Cu
D. 1/0 Cu
Rationale: NEC 310.12 requires 4 AWG copper for 100A services.
