NASCLA ACCREDITED ELECTRICAL CONTRACTOR
EXAM NEWEST EVALUATED EXAM ACTUAL
PRACTICE 120 QUESTIONS 2026-2027|ORIGINAL
QUESTIONS & ANSWERS |DETAILED RATIONALES
|HINTED COMPLETE EXAM PREP GRADED
A+*INSTANT DOWNLOAD PDF*
1. A feeder supplies a continuous load of 48 amperes and a noncontinuous
load of 32 amperes. What is the minimum ampacity required for the feeder
conductors?
A. 80 A
B. 90 A
C. 92 A
D. 100 A
Answer: C. 92 A ✓
The continuous load must be multiplied by 125%: 48 × 1.25 = 60 A. Adding the 32
A noncontinuous load gives 92 A.
2. A 120/240-volt single-phase service supplies a calculated load of 96
amperes. What is the minimum standard service rating that can be selected
when the calculated load exceeds the rating of the next smaller standard
size?
A. 90 A
B. 95 A
C. 100 A
D. 110 A
Answer: C. 100 A ✓
,The service rating must be sufficient for the calculated load. A 100-ampere
standard rating accommodates a calculated load of 96 amperes.
3. A 20-ampere branch circuit supplies receptacles in a dwelling. Which
conductor size is generally required for the circuit?
A. 14 AWG copper
B. 12 AWG copper
C. 10 AWG copper
D. 8 AWG copper
Answer: B. 12 AWG copper ✓
The general ampacity requirement for a 20-ampere branch circuit requires 12
AWG copper conductors unless a specific NEC provision permits otherwise.
4. An electrician installs a 30-ampere, 240-volt circuit using copper
conductors. Which conductor size is generally appropriate when the
conductors are rated according to the standard ampacity table?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: C. 10 AWG ✓
10 AWG copper has an allowable ampacity of 35 amperes in the 75°C column
under the applicable conditions, making it suitable for a 30-ampere circuit.
5. A motor has a full-load current of 28 amperes. The branch-circuit
conductors are required to have an ampacity of at least 125% of the motor
full-load current. What is the minimum required ampacity?
A. 28 A
B. 32 A
C. 35 A
D. 40 A
,Answer: C. 35 A ✓
Motor branch-circuit conductors are generally sized at not less than 125% of
motor full-load current: 28 × 1.25 = 35 amperes.
6. A 480-volt three-phase motor has a full-load current of 18 amperes and is
supplied by conductors with an allowable ampacity of 25 amperes. What is
the primary concern when selecting the motor branch-circuit overcurrent
protection?
A. It must be sized exactly at 18 A
B. It is determined using the applicable motor overcurrent protection
requirements
C. It must always equal conductor ampacity
D. It must be at least twice the motor current
Answer: B. It is determined using the applicable motor overcurrent protection
requirements ✓
Motor overcurrent protection is not simply selected by matching the motor full-
load current or conductor ampacity. The applicable motor rules establish the
permitted protection.
7. A transformer has a 480-volt primary and a 120/240-volt secondary. Which
statement is correct?
A. The secondary voltage is always 480 V
B. The transformer can reduce the voltage while increasing available secondary
current
C. The transformer increases both voltage and current simultaneously
D. The transformer eliminates the need for overcurrent protection
Answer: B. The transformer can reduce the voltage while increasing available
secondary current ✓
An ideal transformer transfers approximately the same power while changing the
relationship between voltage and current.
, 8. A 120-volt load draws 15 amperes. Approximately how much power does
the load consume?
A. 1,200 W
B. 1,500 W
C. 1,800 W
D. 2,400 W
Answer: C. 1,800 W ✓
Power is calculated as P = V × I. Therefore, 120 × 15 = 1,800 watts.
9. A 240-volt heater is rated at 4,800 watts. What current does it draw?
A. 10 A
B. 15 A
C. 20 A
D. 25 A
Answer: C. 20 A ✓
Current is P ÷ V. Thus, 4,800 ÷ 240 = 20 amperes.
10.A continuous load is expected to operate for three hours or more. How
should it generally be treated when sizing conductors and overcurrent
protection?
A. At 50% of its rated current
B. At 80% of its rated current
C. At 100% with the applicable continuous-load adjustment
D. At 150% of its rated current
Answer: C. At 100% with the applicable continuous-load adjustment ✓
Continuous loads are generally calculated at 125% of the continuous load current.
11.An electrical panelboard is installed in a location where working space is
required. Which condition is most important?
EXAM NEWEST EVALUATED EXAM ACTUAL
PRACTICE 120 QUESTIONS 2026-2027|ORIGINAL
QUESTIONS & ANSWERS |DETAILED RATIONALES
|HINTED COMPLETE EXAM PREP GRADED
A+*INSTANT DOWNLOAD PDF*
1. A feeder supplies a continuous load of 48 amperes and a noncontinuous
load of 32 amperes. What is the minimum ampacity required for the feeder
conductors?
A. 80 A
B. 90 A
C. 92 A
D. 100 A
Answer: C. 92 A ✓
The continuous load must be multiplied by 125%: 48 × 1.25 = 60 A. Adding the 32
A noncontinuous load gives 92 A.
2. A 120/240-volt single-phase service supplies a calculated load of 96
amperes. What is the minimum standard service rating that can be selected
when the calculated load exceeds the rating of the next smaller standard
size?
A. 90 A
B. 95 A
C. 100 A
D. 110 A
Answer: C. 100 A ✓
,The service rating must be sufficient for the calculated load. A 100-ampere
standard rating accommodates a calculated load of 96 amperes.
3. A 20-ampere branch circuit supplies receptacles in a dwelling. Which
conductor size is generally required for the circuit?
A. 14 AWG copper
B. 12 AWG copper
C. 10 AWG copper
D. 8 AWG copper
Answer: B. 12 AWG copper ✓
The general ampacity requirement for a 20-ampere branch circuit requires 12
AWG copper conductors unless a specific NEC provision permits otherwise.
4. An electrician installs a 30-ampere, 240-volt circuit using copper
conductors. Which conductor size is generally appropriate when the
conductors are rated according to the standard ampacity table?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: C. 10 AWG ✓
10 AWG copper has an allowable ampacity of 35 amperes in the 75°C column
under the applicable conditions, making it suitable for a 30-ampere circuit.
5. A motor has a full-load current of 28 amperes. The branch-circuit
conductors are required to have an ampacity of at least 125% of the motor
full-load current. What is the minimum required ampacity?
A. 28 A
B. 32 A
C. 35 A
D. 40 A
,Answer: C. 35 A ✓
Motor branch-circuit conductors are generally sized at not less than 125% of
motor full-load current: 28 × 1.25 = 35 amperes.
6. A 480-volt three-phase motor has a full-load current of 18 amperes and is
supplied by conductors with an allowable ampacity of 25 amperes. What is
the primary concern when selecting the motor branch-circuit overcurrent
protection?
A. It must be sized exactly at 18 A
B. It is determined using the applicable motor overcurrent protection
requirements
C. It must always equal conductor ampacity
D. It must be at least twice the motor current
Answer: B. It is determined using the applicable motor overcurrent protection
requirements ✓
Motor overcurrent protection is not simply selected by matching the motor full-
load current or conductor ampacity. The applicable motor rules establish the
permitted protection.
7. A transformer has a 480-volt primary and a 120/240-volt secondary. Which
statement is correct?
A. The secondary voltage is always 480 V
B. The transformer can reduce the voltage while increasing available secondary
current
C. The transformer increases both voltage and current simultaneously
D. The transformer eliminates the need for overcurrent protection
Answer: B. The transformer can reduce the voltage while increasing available
secondary current ✓
An ideal transformer transfers approximately the same power while changing the
relationship between voltage and current.
, 8. A 120-volt load draws 15 amperes. Approximately how much power does
the load consume?
A. 1,200 W
B. 1,500 W
C. 1,800 W
D. 2,400 W
Answer: C. 1,800 W ✓
Power is calculated as P = V × I. Therefore, 120 × 15 = 1,800 watts.
9. A 240-volt heater is rated at 4,800 watts. What current does it draw?
A. 10 A
B. 15 A
C. 20 A
D. 25 A
Answer: C. 20 A ✓
Current is P ÷ V. Thus, 4,800 ÷ 240 = 20 amperes.
10.A continuous load is expected to operate for three hours or more. How
should it generally be treated when sizing conductors and overcurrent
protection?
A. At 50% of its rated current
B. At 80% of its rated current
C. At 100% with the applicable continuous-load adjustment
D. At 150% of its rated current
Answer: C. At 100% with the applicable continuous-load adjustment ✓
Continuous loads are generally calculated at 125% of the continuous load current.
11.An electrical panelboard is installed in a location where working space is
required. Which condition is most important?
