Page 1 of 101
Ontario Electrician Licensing ACTUAL EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS LATEST UPDATE THIS
YEAR
Ontario Electrician Licensing Exam: Complete 200 Questions (1–200)
This comprehensive set covers both the Certificate of Qualification (309A – Construction and
Maintenance Electrician) and the Master Electrician (ME) exams
Part 1: General Electrical Knowledge & Safety (Questions 1–40)
1. What is the standard frequency for residential electrical systems in Ontario?
• A. 50 Hz
• B. 60 Hz
• C. 70 Hz
• D. 80 Hz
Answer: B
Rationale: Canada uses 60 Hz frequency for residential and commercial electrical systems,
consistent with North American standards. Europe uses 50 Hz.
, Page 2 of 101
2. Which colour identifies the neutral conductor in a 120/240 V single-phase system?
• A. Green
• B. Bare copper
• C. White or natural grey
• D. Black
Answer: C
*Rationale: CEC 4-030 requires the identified conductor (neutral) to be white or natural grey.
Grounding conductors are bare or green. Ungrounded conductors (hot) are black, red, or blue.*
3. How often should a ground fault circuit interrupter (GFCI) be tested?
• A. Weekly
• B. Monthly
• C. Yearly
• D. Every 5 years
Answer: B
Rationale: GFCIs should be tested monthly using the test button to ensure proper operation. The
device should trip, and the reset button should restore power.
, Page 3 of 101
4. What is the minimum voltage rating for general indoor lighting circuits in Canada?
• A. 12 V
• B. 24 V
• C. 120 V
• D. 240 V
Answer: C
*Rationale: Standard residential and commercial lighting circuits operate at 120 V. Low-voltage
lighting (12 V, 24 V) is used for specific applications like landscape lighting.*
5. What is the primary purpose of a grounding electrode system?
• A. Increase voltage
• B. Reduce current
• C. Provide a path for fault current to earth
• D. Increase power consumption
Answer: C
Rationale: Grounding provides a low-impedance path for fault current to return to the source,
facilitating overcurrent device operation and reducing shock hazard.
, Page 4 of 101
6. Under the OHSA, what is the primary duty of an employer?
• A. Maximize production
• B. Ensure worker health and safety
• C. Minimize training costs
• D. Reduce insurance premiums
Answer: B
Rationale: OHSA Section 25 requires employers to take every reasonable precaution to protect
worker health and safety.
7. What does WHMIS stand for?
• A. Workplace Hazardous Materials Information System
• B. Worker Health and Material Identification Standard
• C. Workplace Health and Manufacturing Information System
• D. Worker Hazardous Material Insurance Standard
Answer: A
Rationale: WHMIS is Canada's national hazard communication standard for hazardous
workplace products, requiring labels and Safety Data Sheets (SDS).
Ontario Electrician Licensing ACTUAL EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS LATEST UPDATE THIS
YEAR
Ontario Electrician Licensing Exam: Complete 200 Questions (1–200)
This comprehensive set covers both the Certificate of Qualification (309A – Construction and
Maintenance Electrician) and the Master Electrician (ME) exams
Part 1: General Electrical Knowledge & Safety (Questions 1–40)
1. What is the standard frequency for residential electrical systems in Ontario?
• A. 50 Hz
• B. 60 Hz
• C. 70 Hz
• D. 80 Hz
Answer: B
Rationale: Canada uses 60 Hz frequency for residential and commercial electrical systems,
consistent with North American standards. Europe uses 50 Hz.
, Page 2 of 101
2. Which colour identifies the neutral conductor in a 120/240 V single-phase system?
• A. Green
• B. Bare copper
• C. White or natural grey
• D. Black
Answer: C
*Rationale: CEC 4-030 requires the identified conductor (neutral) to be white or natural grey.
Grounding conductors are bare or green. Ungrounded conductors (hot) are black, red, or blue.*
3. How often should a ground fault circuit interrupter (GFCI) be tested?
• A. Weekly
• B. Monthly
• C. Yearly
• D. Every 5 years
Answer: B
Rationale: GFCIs should be tested monthly using the test button to ensure proper operation. The
device should trip, and the reset button should restore power.
, Page 3 of 101
4. What is the minimum voltage rating for general indoor lighting circuits in Canada?
• A. 12 V
• B. 24 V
• C. 120 V
• D. 240 V
Answer: C
*Rationale: Standard residential and commercial lighting circuits operate at 120 V. Low-voltage
lighting (12 V, 24 V) is used for specific applications like landscape lighting.*
5. What is the primary purpose of a grounding electrode system?
• A. Increase voltage
• B. Reduce current
• C. Provide a path for fault current to earth
• D. Increase power consumption
Answer: C
Rationale: Grounding provides a low-impedance path for fault current to return to the source,
facilitating overcurrent device operation and reducing shock hazard.
, Page 4 of 101
6. Under the OHSA, what is the primary duty of an employer?
• A. Maximize production
• B. Ensure worker health and safety
• C. Minimize training costs
• D. Reduce insurance premiums
Answer: B
Rationale: OHSA Section 25 requires employers to take every reasonable precaution to protect
worker health and safety.
7. What does WHMIS stand for?
• A. Workplace Hazardous Materials Information System
• B. Worker Health and Material Identification Standard
• C. Workplace Health and Manufacturing Information System
• D. Worker Hazardous Material Insurance Standard
Answer: A
Rationale: WHMIS is Canada's national hazard communication standard for hazardous
workplace products, requiring labels and Safety Data Sheets (SDS).
