Arkansas Master Electrician Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A Instant
Download Pdf
1.
A 120/240-volt, single-phase service supplies a dwelling with a calculated load of
42,000 VA. What is the approximate service current?
A. 125 A
B. 150 A
C. 175 A
D. 200 A
Answer: 175 A
Rationale: For a single-phase service, current is calculated as VA ÷ volts. Thus,
42,000 ÷ 240 = 175 A. The next standard service rating would generally need to
accommodate the calculated load.
2.
A 480Y/277-volt, three-phase feeder supplies a balanced load of 96 kVA. What is
the approximate line current?
A. 116 A
B. 200 A
,C. 231 A
D. 346 A
Answer: 116 A
Rationale: Three-phase current is calculated as VA ÷ (√3 × voltage). Therefore,
96,000 ÷ (1.732 × 480) ≈ 115.5 A.
3.
A continuous load is calculated at 64 A. Assuming no special exception applies,
what minimum ampacity is required for the circuit conductors?
A. 64 A
B. 70 A
C. 80 A
D. 85 A
Answer: 80 A
Rationale: Continuous loads are generally calculated at 125% of the continuous
portion. 64 A × 1.25 = 80 A.
4.
A conductor has an allowable ampacity of 90 A but its termination equipment is
rated only 75°C. Which ampacity limitation is generally controlling when the
conductor size is selected?
A. 60°C ampacity
B. 75°C ampacity
C. 90°C ampacity
D. 100°C ampacity
Answer: 75°C ampacity
,Rationale: Equipment termination temperature ratings must be considered. The
conductor's usable ampacity cannot exceed the applicable limitation imposed by
the termination rating.
5.
A 90°C-rated conductor is installed where the terminals are rated 75°C. Why can
the 90°C column still be useful?
A. It automatically permits a higher final ampacity
B. It can be used for adjustment and correction calculations when permitted
C. It eliminates the need for overcurrent protection
D. It permits the conductor to exceed its insulation rating
Answer: It can be used for adjustment and correction calculations when
permitted
Rationale: The 90°C rating can be useful as the starting point for adjustment or
correction calculations, while the final ampacity remains subject to the
applicable termination limitations.
6.
What is the primary purpose of bonding metal equipment enclosures?
A. Increase operating voltage
B. Provide a low-impedance fault-current path
C. Reduce normal load current
D. Increase conductor ampacity
Answer: Provide a low-impedance fault-current path
, Rationale: Bonding connects normally non-current-carrying metal parts so a
fault can return sufficient current to operate the overcurrent protective device
promptly.
7.
Which conductor normally carries the grounded current on a 120/240-volt single-
phase, three-wire system?
A. Equipment grounding conductor only
B. Grounding electrode conductor only
C. Grounded conductor
D. Bonding jumper
Answer: Grounded conductor
Rationale: The grounded conductor is intended to carry unbalanced current in a
multiwire circuit. The equipment grounding conductor normally carries current
only during abnormal conditions.
8.
At a service disconnect, where is the grounded conductor generally permitted to
be bonded to the service enclosure?
A. At every panelboard
B. At the service disconnecting means
C. At every branch circuit
D. Only at the grounding electrode
Answer: At the service disconnecting means
Rationale: The service disconnect is the principal location where the grounded
conductor is bonded to the service equipment enclosure. Downstream
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A Instant
Download Pdf
1.
A 120/240-volt, single-phase service supplies a dwelling with a calculated load of
42,000 VA. What is the approximate service current?
A. 125 A
B. 150 A
C. 175 A
D. 200 A
Answer: 175 A
Rationale: For a single-phase service, current is calculated as VA ÷ volts. Thus,
42,000 ÷ 240 = 175 A. The next standard service rating would generally need to
accommodate the calculated load.
2.
A 480Y/277-volt, three-phase feeder supplies a balanced load of 96 kVA. What is
the approximate line current?
A. 116 A
B. 200 A
,C. 231 A
D. 346 A
Answer: 116 A
Rationale: Three-phase current is calculated as VA ÷ (√3 × voltage). Therefore,
96,000 ÷ (1.732 × 480) ≈ 115.5 A.
3.
A continuous load is calculated at 64 A. Assuming no special exception applies,
what minimum ampacity is required for the circuit conductors?
A. 64 A
B. 70 A
C. 80 A
D. 85 A
Answer: 80 A
Rationale: Continuous loads are generally calculated at 125% of the continuous
portion. 64 A × 1.25 = 80 A.
4.
A conductor has an allowable ampacity of 90 A but its termination equipment is
rated only 75°C. Which ampacity limitation is generally controlling when the
conductor size is selected?
A. 60°C ampacity
B. 75°C ampacity
C. 90°C ampacity
D. 100°C ampacity
Answer: 75°C ampacity
,Rationale: Equipment termination temperature ratings must be considered. The
conductor's usable ampacity cannot exceed the applicable limitation imposed by
the termination rating.
5.
A 90°C-rated conductor is installed where the terminals are rated 75°C. Why can
the 90°C column still be useful?
A. It automatically permits a higher final ampacity
B. It can be used for adjustment and correction calculations when permitted
C. It eliminates the need for overcurrent protection
D. It permits the conductor to exceed its insulation rating
Answer: It can be used for adjustment and correction calculations when
permitted
Rationale: The 90°C rating can be useful as the starting point for adjustment or
correction calculations, while the final ampacity remains subject to the
applicable termination limitations.
6.
What is the primary purpose of bonding metal equipment enclosures?
A. Increase operating voltage
B. Provide a low-impedance fault-current path
C. Reduce normal load current
D. Increase conductor ampacity
Answer: Provide a low-impedance fault-current path
, Rationale: Bonding connects normally non-current-carrying metal parts so a
fault can return sufficient current to operate the overcurrent protective device
promptly.
7.
Which conductor normally carries the grounded current on a 120/240-volt single-
phase, three-wire system?
A. Equipment grounding conductor only
B. Grounding electrode conductor only
C. Grounded conductor
D. Bonding jumper
Answer: Grounded conductor
Rationale: The grounded conductor is intended to carry unbalanced current in a
multiwire circuit. The equipment grounding conductor normally carries current
only during abnormal conditions.
8.
At a service disconnect, where is the grounded conductor generally permitted to
be bonded to the service enclosure?
A. At every panelboard
B. At the service disconnecting means
C. At every branch circuit
D. Only at the grounding electrode
Answer: At the service disconnecting means
Rationale: The service disconnect is the principal location where the grounded
conductor is bonded to the service equipment enclosure. Downstream
