Ontario Electrician Licensing Exam Questions
And Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. What is the standard nominal voltage for most residential branch
circuits in Ontario?
A. 120/240 V
B. 208/120 V
C. 347/600 V
D. 480/277 V
Answer: A
Most residential services operate on single-phase 120/240 V
systems.
2. What color is typically used for the identified (neutral) conductor
in Ontario?
A. Red
B. Black
C. White
D. Blue
Answer: C
White or natural gray identifies the neutral conductor.
3. The minimum depth for underground rigid PVC conduit under a
driveway is:
A. 150 mm
B. 300 mm
, C. 450 mm
D. 600 mm
Answer: D
Driveways require deeper burial for protection.
4. Aluminum conductors must be terminated using:
A. Any copper-approved connector
B. Twist-on wire connectors only
C. CO/ALR or AL-rated connectors
D. Solder-only connections
Answer: C
Aluminum requires AL-rated terminations to prevent overheating.
5. The purpose of bonding is to:
A. Lower voltage
B. Improve insulation
C. Ensure metal parts remain at earth potential
D. Increase conductor ampacity
Answer: C
Bonding keeps exposed metal parts at safe potential.
6. A GFCI is primarily used to protect against:
A. Overcurrent
B. Overvoltage
C. Arc faults
D. Ground fault shock hazard
Answer: D
GFCIs detect imbalances between hot and neutral to prevent
shock.
, 7. The minimum height for overhead service conductors above a
walkway is:
A. 2.5 m
B. 3.0 m
C. 3.5 m
D. 4.5 m
Answer: B
Walkways require at least 3.0 m clearance.
8. Copper AWG 14 has a maximum ampacity of:
A. 10 A
B. 15 A
C. 20 A
D. 25 A
Answer: B
AWG 14 copper is limited to 15 A circuits.
9. A bathroom receptacle must be protected by:
A. Standard breaker
B. AFCI only
C. GFCI
D. Isolated ground
Answer: C
Bathrooms require GFCI protection due to moisture.
10. When using EMT conduit, support must be provided at least
every:
A. 1 m
B. 1.5 m
C. 2 m
And Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. What is the standard nominal voltage for most residential branch
circuits in Ontario?
A. 120/240 V
B. 208/120 V
C. 347/600 V
D. 480/277 V
Answer: A
Most residential services operate on single-phase 120/240 V
systems.
2. What color is typically used for the identified (neutral) conductor
in Ontario?
A. Red
B. Black
C. White
D. Blue
Answer: C
White or natural gray identifies the neutral conductor.
3. The minimum depth for underground rigid PVC conduit under a
driveway is:
A. 150 mm
B. 300 mm
, C. 450 mm
D. 600 mm
Answer: D
Driveways require deeper burial for protection.
4. Aluminum conductors must be terminated using:
A. Any copper-approved connector
B. Twist-on wire connectors only
C. CO/ALR or AL-rated connectors
D. Solder-only connections
Answer: C
Aluminum requires AL-rated terminations to prevent overheating.
5. The purpose of bonding is to:
A. Lower voltage
B. Improve insulation
C. Ensure metal parts remain at earth potential
D. Increase conductor ampacity
Answer: C
Bonding keeps exposed metal parts at safe potential.
6. A GFCI is primarily used to protect against:
A. Overcurrent
B. Overvoltage
C. Arc faults
D. Ground fault shock hazard
Answer: D
GFCIs detect imbalances between hot and neutral to prevent
shock.
, 7. The minimum height for overhead service conductors above a
walkway is:
A. 2.5 m
B. 3.0 m
C. 3.5 m
D. 4.5 m
Answer: B
Walkways require at least 3.0 m clearance.
8. Copper AWG 14 has a maximum ampacity of:
A. 10 A
B. 15 A
C. 20 A
D. 25 A
Answer: B
AWG 14 copper is limited to 15 A circuits.
9. A bathroom receptacle must be protected by:
A. Standard breaker
B. AFCI only
C. GFCI
D. Isolated ground
Answer: C
Bathrooms require GFCI protection due to moisture.
10. When using EMT conduit, support must be provided at least
every:
A. 1 m
B. 1.5 m
C. 2 m
