ALBERTA ELECTRICIAN FOURTH PERIOD AIT EXAM – QUESTIONS AND ANSWERS | VERIFIED AND
WELL DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
CORE DOMAINS
1. Electrical Theory and Principles
2. Wiring Methods and Materials
3. Overcurrent Protection and Coordination
4. Grounding and Bonding
5. Motors and Motor Controls
6. Transformers and Power Distribution
7. Hazardous Locations and Special Occupancies
8. Electrical Safety and Personal Protective Equipment (PPE)
9. Canadian Electrical Code (CEC) – Part I
10. Professional Practice and Ethics
INTRODUCTION
This comprehensive assessment is designed to evaluate the knowledge and practical skills of an
electrician at the Fourth Period Apprenticeship (AIT) level. The exam rigorously tests foundational
electrical theory, the application of the Canadian Electrical Code, and the professional judgment
required to solve complex, real-world problems encountered on the job. Candidates will demonstrate
their ability to interpret regulations, apply safety protocols, and make informed technical decisions.
The exam is structured as a series of multiple-choice and scenario-based questions, placing a strong
emphasis on critical thinking, ethical conduct, and the practical application of electrical principles. The
questions presented are of varying difficulty to ensure a thorough evaluation of a candidate's
readiness for the trade.
SECTION ONE: QUESTIONS 1 – 100
1. A 120V branch circuit is to supply a continuous load of 16A. What is the minimum ampacity
required for the conductors supplying this load, as per the Canadian Electrical Code?
A. 16A
B. 20A
C. 24A
D. 32A
🟢 C. 24A
🔴 Explanation: Rule 8-104 of the CEC requires that the conductor ampacity for a continuous load
must be at least 125% of the continuous load. 16A x 1.25 = 20A. The minimum standard
,overcurrent device size is 20A (Rule 14-104), but the conductor ampacity must be rated for the
continuous load plus 125%, which is 20A. However, the question asks for the minimum ampacity of
the conductors. Conductors must have an ampacity not less than 125% of the continuous load. 16A
x 1.25 = 20A. Since 20A conductors are required, and a 20A breaker is used, the minimum
conductor ampacity is 20A. Wait, the options are 16, 20, 24, 32. 16A x 1.25 = 20A. But a standard
20A breaker protects 20A conductors. The conductors must have an ampacity of 20A. However, if
the load is 16A continuous, the breaker must be 20A, and the conductors must be sized for 20A. So
the correct answer is B. 20A. Let's re-evaluate. Rule 8-104 (5)(a) states that where a branch circuit
supplies a continuous load, the rating of the overcurrent device shall be not less than 125% of the
continuous load. So 16A x 1.25 = 20A. The conductor ampacity must be at least the rating of the
overcurrent device (Rule 14-104), so 20A. My initial thought was 20A. Let's select B. 20A. I will
correct the answer.
1. A 120V branch circuit is to supply a continuous load of 16A. What is the minimum ampacity
required for the conductors supplying this load, as per the Canadian Electrical Code?
A. 16A
B. 20A
C. 24A
D. 32A
🟢 B. 20A
🔴 Explanation: Rule 8-104(5)(a) mandates that the overcurrent device rating for a continuous load
must be 125% of the load (16A x 1.25 = 20A). Furthermore, Rule 14-104 requires the conductor
ampacity to be at least that of the overcurrent device protecting it, therefore the minimum
conductor ampacity is 20A.
2. What is the minimum allowable bending radius for a single-conductor, lead-covered, armoured
cable?
A. 5 times the overall diameter
B. 8 times the overall diameter
C. 10 times the overall diameter
D. 12 times the overall diameter
🟢 D. 12 times the overall diameter
🔴 Explanation: Rule 12-108 specifies minimum bending radii for various cable types. For a single-
conductor, lead-covered, armoured cable, the minimum bending radius is 12 times the overall
diameter.
3. A transformer has a primary voltage of 480V and a secondary voltage of 120V. If the primary
current is 25A, what is the secondary current, assuming a perfectly efficient transformer?
A. 6.25A
B. 25A
,C. 100A
D. 120A
🟢 C. 100A
🔴 Explanation: For an ideal transformer, the power in the primary equals the power in the
secondary (Vp x Ip = Vs x Is). Therefore, Is = (Vp x Ip) / Vs = (480V x 25A) / 120V = 100A.
4. Which of the following methods is the PREFERRED method for reducing the effects of
electromagnetic interference (EMI) in control circuits?
A. Using larger gauge wire
B. Increasing the operating voltage
C. Twisting the conductor pairs
D. Routing the conductors in a steel conduit
🟢 C. Twisting the conductor pairs
🔴 Explanation: Twisting conductor pairs is a highly effective method for reducing EMI. The twist
ensures that both conductors are equally exposed to the interfering magnetic field, which induces
common-mode currents that are cancelled out at the receiving end.
5. A motor is drawing 15A on a 240V circuit. A clamp-on ammeter reads 15A on one phase
conductor. What is the current on the neutral conductor for a balanced 3-phase, 4-wire system?
A. 0A
B. 5A
C. 15A
D. 45A
🟢 A. 0A
🔴 Explanation: In a perfectly balanced 3-phase, 4-wire system (wye-connected), the vector sum of
the three phase currents in the neutral is zero, resulting in a neutral current of 0A.
6. What is the maximum permissible distance a pull box can be from a 90-degree bend in a conduit
run, according to the CEC, to allow for conductor pulling?
A. No maximum
B. 1.5 meters
C. 2.0 meters
D. 5.0 meters
🟢 D. 5.0 meters
, 🔴 Explanation: Rule 12-1114(2) states that a pull box or junction box must be installed where the
distance from a bend to the next pull point exceeds 5 meters, or if the total aggregate of bends
exceeds 270 degrees.
7. What is the main purpose of a surge protective device (SPD) installed at the main electrical
service?
A. To improve the power factor
B. To protect against overcurrent faults
C. To provide a path for fault current
D. To protect equipment from transient overvoltages
🟢 D. To protect equipment from transient overvoltages
🔴 Explanation: The primary function of an SPD (formerly called a lightning arrester or TVSS) is to
limit transient overvoltages (surges) caused by lightning strikes or switching operations and divert
the surge current to ground, protecting connected equipment.
8. A job site requires temporary wiring. What is the minimum height for overhead service
conductors installed over a roadway, as per the CEC?
A. 3.5 meters
B. 4.5 meters
C. 5.0 meters
D. 6.0 meters
🟢 C. 5.0 meters
🔴 Explanation: Rule 6-112 dictates the minimum clearances for overhead conductors. For
conductors over roadways, the minimum height is 5.0 meters.
9. Which of the following is a Class I, Division 1 location?
A. A paint storage room
B. A grain elevator
C. An area where flammable gases or vapors are continuously present
D. An area adjacent to a storage tank containing flammable liquid
🟢 C. An area where flammable gases or vapors are continuously present
🔴 Explanation: Class I locations are those where flammable gases or vapors are or may be present.
Division 1 signifies that the hazard exists under normal operating conditions, continuously,
intermittently, or periodically. A paint storage room is Class I, Division 2.
WELL DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
CORE DOMAINS
1. Electrical Theory and Principles
2. Wiring Methods and Materials
3. Overcurrent Protection and Coordination
4. Grounding and Bonding
5. Motors and Motor Controls
6. Transformers and Power Distribution
7. Hazardous Locations and Special Occupancies
8. Electrical Safety and Personal Protective Equipment (PPE)
9. Canadian Electrical Code (CEC) – Part I
10. Professional Practice and Ethics
INTRODUCTION
This comprehensive assessment is designed to evaluate the knowledge and practical skills of an
electrician at the Fourth Period Apprenticeship (AIT) level. The exam rigorously tests foundational
electrical theory, the application of the Canadian Electrical Code, and the professional judgment
required to solve complex, real-world problems encountered on the job. Candidates will demonstrate
their ability to interpret regulations, apply safety protocols, and make informed technical decisions.
The exam is structured as a series of multiple-choice and scenario-based questions, placing a strong
emphasis on critical thinking, ethical conduct, and the practical application of electrical principles. The
questions presented are of varying difficulty to ensure a thorough evaluation of a candidate's
readiness for the trade.
SECTION ONE: QUESTIONS 1 – 100
1. A 120V branch circuit is to supply a continuous load of 16A. What is the minimum ampacity
required for the conductors supplying this load, as per the Canadian Electrical Code?
A. 16A
B. 20A
C. 24A
D. 32A
🟢 C. 24A
🔴 Explanation: Rule 8-104 of the CEC requires that the conductor ampacity for a continuous load
must be at least 125% of the continuous load. 16A x 1.25 = 20A. The minimum standard
,overcurrent device size is 20A (Rule 14-104), but the conductor ampacity must be rated for the
continuous load plus 125%, which is 20A. However, the question asks for the minimum ampacity of
the conductors. Conductors must have an ampacity not less than 125% of the continuous load. 16A
x 1.25 = 20A. Since 20A conductors are required, and a 20A breaker is used, the minimum
conductor ampacity is 20A. Wait, the options are 16, 20, 24, 32. 16A x 1.25 = 20A. But a standard
20A breaker protects 20A conductors. The conductors must have an ampacity of 20A. However, if
the load is 16A continuous, the breaker must be 20A, and the conductors must be sized for 20A. So
the correct answer is B. 20A. Let's re-evaluate. Rule 8-104 (5)(a) states that where a branch circuit
supplies a continuous load, the rating of the overcurrent device shall be not less than 125% of the
continuous load. So 16A x 1.25 = 20A. The conductor ampacity must be at least the rating of the
overcurrent device (Rule 14-104), so 20A. My initial thought was 20A. Let's select B. 20A. I will
correct the answer.
1. A 120V branch circuit is to supply a continuous load of 16A. What is the minimum ampacity
required for the conductors supplying this load, as per the Canadian Electrical Code?
A. 16A
B. 20A
C. 24A
D. 32A
🟢 B. 20A
🔴 Explanation: Rule 8-104(5)(a) mandates that the overcurrent device rating for a continuous load
must be 125% of the load (16A x 1.25 = 20A). Furthermore, Rule 14-104 requires the conductor
ampacity to be at least that of the overcurrent device protecting it, therefore the minimum
conductor ampacity is 20A.
2. What is the minimum allowable bending radius for a single-conductor, lead-covered, armoured
cable?
A. 5 times the overall diameter
B. 8 times the overall diameter
C. 10 times the overall diameter
D. 12 times the overall diameter
🟢 D. 12 times the overall diameter
🔴 Explanation: Rule 12-108 specifies minimum bending radii for various cable types. For a single-
conductor, lead-covered, armoured cable, the minimum bending radius is 12 times the overall
diameter.
3. A transformer has a primary voltage of 480V and a secondary voltage of 120V. If the primary
current is 25A, what is the secondary current, assuming a perfectly efficient transformer?
A. 6.25A
B. 25A
,C. 100A
D. 120A
🟢 C. 100A
🔴 Explanation: For an ideal transformer, the power in the primary equals the power in the
secondary (Vp x Ip = Vs x Is). Therefore, Is = (Vp x Ip) / Vs = (480V x 25A) / 120V = 100A.
4. Which of the following methods is the PREFERRED method for reducing the effects of
electromagnetic interference (EMI) in control circuits?
A. Using larger gauge wire
B. Increasing the operating voltage
C. Twisting the conductor pairs
D. Routing the conductors in a steel conduit
🟢 C. Twisting the conductor pairs
🔴 Explanation: Twisting conductor pairs is a highly effective method for reducing EMI. The twist
ensures that both conductors are equally exposed to the interfering magnetic field, which induces
common-mode currents that are cancelled out at the receiving end.
5. A motor is drawing 15A on a 240V circuit. A clamp-on ammeter reads 15A on one phase
conductor. What is the current on the neutral conductor for a balanced 3-phase, 4-wire system?
A. 0A
B. 5A
C. 15A
D. 45A
🟢 A. 0A
🔴 Explanation: In a perfectly balanced 3-phase, 4-wire system (wye-connected), the vector sum of
the three phase currents in the neutral is zero, resulting in a neutral current of 0A.
6. What is the maximum permissible distance a pull box can be from a 90-degree bend in a conduit
run, according to the CEC, to allow for conductor pulling?
A. No maximum
B. 1.5 meters
C. 2.0 meters
D. 5.0 meters
🟢 D. 5.0 meters
, 🔴 Explanation: Rule 12-1114(2) states that a pull box or junction box must be installed where the
distance from a bend to the next pull point exceeds 5 meters, or if the total aggregate of bends
exceeds 270 degrees.
7. What is the main purpose of a surge protective device (SPD) installed at the main electrical
service?
A. To improve the power factor
B. To protect against overcurrent faults
C. To provide a path for fault current
D. To protect equipment from transient overvoltages
🟢 D. To protect equipment from transient overvoltages
🔴 Explanation: The primary function of an SPD (formerly called a lightning arrester or TVSS) is to
limit transient overvoltages (surges) caused by lightning strikes or switching operations and divert
the surge current to ground, protecting connected equipment.
8. A job site requires temporary wiring. What is the minimum height for overhead service
conductors installed over a roadway, as per the CEC?
A. 3.5 meters
B. 4.5 meters
C. 5.0 meters
D. 6.0 meters
🟢 C. 5.0 meters
🔴 Explanation: Rule 6-112 dictates the minimum clearances for overhead conductors. For
conductors over roadways, the minimum height is 5.0 meters.
9. Which of the following is a Class I, Division 1 location?
A. A paint storage room
B. A grain elevator
C. An area where flammable gases or vapors are continuously present
D. An area adjacent to a storage tank containing flammable liquid
🟢 C. An area where flammable gases or vapors are continuously present
🔴 Explanation: Class I locations are those where flammable gases or vapors are or may be present.
Division 1 signifies that the hazard exists under normal operating conditions, continuously,
intermittently, or periodically. A paint storage room is Class I, Division 2.
