ONTARIO ELECTRICIAN LICENSING EXAM
QUESTIONS AND CORRECT ANSWERS
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
D. 3 m
Answer: C
EMT must be supported approximately every 3 m.
11. A multi-wire branch circuit shares:
A. Two neutrals
B. No neutral
C. One neutral
D. Only grounds
Answer: C
MWBCs share a common neutral between two hot legs.
12. What is the frequency of electrical systems in Canada?
A. 50 Hz
B. 60 Hz
C. 100 Hz
D. 120 Hz
QUESTIONS AND CORRECT ANSWERS
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
D. 3 m
Answer: C
EMT must be supported approximately every 3 m.
11. A multi-wire branch circuit shares:
A. Two neutrals
B. No neutral
C. One neutral
D. Only grounds
Answer: C
MWBCs share a common neutral between two hot legs.
12. What is the frequency of electrical systems in Canada?
A. 50 Hz
B. 60 Hz
C. 100 Hz
D. 120 Hz
