Alberta Electrician
Fourth Period AIT Exam
Practice Questions and Answers with Rationales| Latest Update
,Q1. Under the Canadian Electrical Code, what is the primary purpose of
the Code?
A) To guarantee equipment will never fail
B) The safeguarding of persons and property from electrical hazards
C) To standardize electrical equipment pricing
D) To regulate the training of apprentices only
Answer: B) The safeguarding of persons and property from electrical
hazards
Rationale: Rule 2-000 (Scope) and the Code's stated objective is protection of
persons and property from fire and shock hazards arising from the use of
electricity; it is not a design or performance guarantee.
Q2. A dwelling unit has a calculated basic load of 24,000 W using Rule
8-200. What minimum ampacity service conductor is required for a 240 V
single-phase supply?
A) 80 A
B) 100 A
C) 125 A
D) 150 A
Answer: B) 100 A
Rationale: 24,000 W ÷ 240 V = 100 A, and Rule 8-200 together with Table
equivalents sets the minimum service size at the next standard rating, which
is 100 A for this calculated load.
Q3. Per Rule 4-004, what factor must be applied to the ampacity of
conductors when more than three current-carrying conductors are
installed in a raceway?
A) Voltage drop factor only
B) Ambient temperature correction only
C) Both ambient temperature correction and a derating (adjustment) factor
for conductor grouping
D) No factor is required if conduit is oversized
,Answer: C) Both ambient temperature correction and a derating
(adjustment) factor for conductor grouping
Rationale: Rule 4-004 requires both an ambient temperature correction and
an adjustment (derating) factor from Table 5C when more than three
current-carrying conductors are grouped in a single raceway or cable.
Q4. What is the maximum allowable voltage drop recommended by the
CEC from the service to the farthest outlet, combined feeder and branch
circuit?
A) 2%
B) 3%
C) 5%
D) 8%
Answer: C) 5%
Rationale: Appendix B guidance to Rule 8-102 recommends a maximum
combined voltage drop of 5%, typically split as 3% for feeders and 2% for
branch circuits.
Q5. According to the CEC, bonding conductors are sized based on which
rule/table?
A) Table 1
B) Table 16
C) Table 41
D) Rule 10-814 and Table 16
Answer: D) Rule 10-814 and Table 16
Rationale: Rule 10-814 directs the use of Table 16 to size bonding conductors
according to the rating of the overcurrent device protecting the circuit.
Q6. For a feeder supplying a continuous load, what demand factor must
be applied to the continuous portion when sizing conductors and
overcurrent protection, per Rule 8-104?
A) 50%
B) 80%
C) 100%
D) 125%
, Answer: D) 125%
Rationale: Rule 8-104(3) requires conductors and OCPDs for continuous
loads to be sized at 125% of the continuous load (i.e., the continuous load
cannot exceed 80% of the rating).
Q7. What is the minimum size of copper grounding conductor required for
a service disconnect protected at 200 A, per Table 17?
A) No. 8 AWG
B) No. 6 AWG
C) No. 4 AWG
D) No. 2 AWG
Answer: C) No. 4 AWG
Rationale: Table 17 specifies a No. 4 AWG copper grounding conductor for
services rated up to and including 200 A.
Q8. A panelboard is installed in a location subject to corrosive conditions.
What does the CEC require in this situation?
A) Standard steel enclosures are always acceptable
B) Equipment suitably identified/protected for the corrosive environment
must be used
C) Only wood enclosures may be used
D) No special requirement applies
Answer: B) Equipment suitably identified/protected for the corrosive
environment must be used
Rationale: Rule 2-400 and related rules require electrical equipment installed
in corrosive locations to be constructed of, or protected against, materials
suitable for that environment.
Q9. What does Rule 12-108 require regarding conductors installed in wet
locations?
A) Conductors must be rated for the wet location or suitably protected
B) Only aluminum conductors are permitted
C) No insulation is required outdoors
D) Wet-location wiring is prohibited by the CEC
Fourth Period AIT Exam
Practice Questions and Answers with Rationales| Latest Update
,Q1. Under the Canadian Electrical Code, what is the primary purpose of
the Code?
A) To guarantee equipment will never fail
B) The safeguarding of persons and property from electrical hazards
C) To standardize electrical equipment pricing
D) To regulate the training of apprentices only
Answer: B) The safeguarding of persons and property from electrical
hazards
Rationale: Rule 2-000 (Scope) and the Code's stated objective is protection of
persons and property from fire and shock hazards arising from the use of
electricity; it is not a design or performance guarantee.
Q2. A dwelling unit has a calculated basic load of 24,000 W using Rule
8-200. What minimum ampacity service conductor is required for a 240 V
single-phase supply?
A) 80 A
B) 100 A
C) 125 A
D) 150 A
Answer: B) 100 A
Rationale: 24,000 W ÷ 240 V = 100 A, and Rule 8-200 together with Table
equivalents sets the minimum service size at the next standard rating, which
is 100 A for this calculated load.
Q3. Per Rule 4-004, what factor must be applied to the ampacity of
conductors when more than three current-carrying conductors are
installed in a raceway?
A) Voltage drop factor only
B) Ambient temperature correction only
C) Both ambient temperature correction and a derating (adjustment) factor
for conductor grouping
D) No factor is required if conduit is oversized
,Answer: C) Both ambient temperature correction and a derating
(adjustment) factor for conductor grouping
Rationale: Rule 4-004 requires both an ambient temperature correction and
an adjustment (derating) factor from Table 5C when more than three
current-carrying conductors are grouped in a single raceway or cable.
Q4. What is the maximum allowable voltage drop recommended by the
CEC from the service to the farthest outlet, combined feeder and branch
circuit?
A) 2%
B) 3%
C) 5%
D) 8%
Answer: C) 5%
Rationale: Appendix B guidance to Rule 8-102 recommends a maximum
combined voltage drop of 5%, typically split as 3% for feeders and 2% for
branch circuits.
Q5. According to the CEC, bonding conductors are sized based on which
rule/table?
A) Table 1
B) Table 16
C) Table 41
D) Rule 10-814 and Table 16
Answer: D) Rule 10-814 and Table 16
Rationale: Rule 10-814 directs the use of Table 16 to size bonding conductors
according to the rating of the overcurrent device protecting the circuit.
Q6. For a feeder supplying a continuous load, what demand factor must
be applied to the continuous portion when sizing conductors and
overcurrent protection, per Rule 8-104?
A) 50%
B) 80%
C) 100%
D) 125%
, Answer: D) 125%
Rationale: Rule 8-104(3) requires conductors and OCPDs for continuous
loads to be sized at 125% of the continuous load (i.e., the continuous load
cannot exceed 80% of the rating).
Q7. What is the minimum size of copper grounding conductor required for
a service disconnect protected at 200 A, per Table 17?
A) No. 8 AWG
B) No. 6 AWG
C) No. 4 AWG
D) No. 2 AWG
Answer: C) No. 4 AWG
Rationale: Table 17 specifies a No. 4 AWG copper grounding conductor for
services rated up to and including 200 A.
Q8. A panelboard is installed in a location subject to corrosive conditions.
What does the CEC require in this situation?
A) Standard steel enclosures are always acceptable
B) Equipment suitably identified/protected for the corrosive environment
must be used
C) Only wood enclosures may be used
D) No special requirement applies
Answer: B) Equipment suitably identified/protected for the corrosive
environment must be used
Rationale: Rule 2-400 and related rules require electrical equipment installed
in corrosive locations to be constructed of, or protected against, materials
suitable for that environment.
Q9. What does Rule 12-108 require regarding conductors installed in wet
locations?
A) Conductors must be rated for the wet location or suitably protected
B) Only aluminum conductors are permitted
C) No insulation is required outdoors
D) Wet-location wiring is prohibited by the CEC
