Electrical: NEC Level 4, Entire First
Semester Exam Questions And Answers
The minimum ampacity for a feeder supplying ten 30A shore power
receptacles in a marina is _____. -
correct answer ✅120A
10 x 30A x 120V = 36,000VA
36,000VA x 0.8 = 28,800VA
28,000VA ÷ 240V = 120A
The smallest size locking and grounding type receptacle that may
be used to provide shore power for boats is _____ -
correct answer ✅30A
Refer to Figure 1. What is the total load a feeder serving four 2hp
motors, three 5hp motors, one 15hp motor, and one 25hp motor?
All motors are 208V. -
correct answer ✅219.8A
Use of the 100' tap rule is limited to installation in high-bay
manufacturing buildings with wall heights over _____. -
correct answer ✅35 feet
,Electrical: NEC Level 4, Entire First
Semester Exam Questions And Answers
What is the load for 40 non-dwelling unit receptacles? (Assume
that the load is not continuous.) -
correct answer ✅7,200VA
180VA per receptacle x 40 receptacles = 7,200VA
The interior lighting load for a school building with 175,000 square
feet of floor space is _____. -
correct answer ✅525,000VA
175,000 ft2 x 3VA/ft2 = 525,000VA
NEC Table 220.12 requires a minimum general lighting load for
office buildings to be based on _____. -
correct answer ✅3-1/2 VA/ft2
What is the feeder ampacity for a three-phase, 120/208V subpanel
with a connected load of 84,563VA? -
correct answer ✅235A
I = VA ÷ (V x √3) = 84,563VA ÷ (208V x 1.732) = 235A
A farm has three buildings with loads of 82A, 65A and 15A. What is
the total demand load? Assume that there are no dwellings or
,Electrical: NEC Level 4, Entire First
Semester Exam Questions And Answers
motors, and each building is an independent single load. -
correct answer ✅117A
(82A x 1) + (60A x 0.5) + [(5A +15A) x 0.25] = 82A + 30A + 5A = 117A
When performing load calculations for farm buildings, the load that
must be included in the calculation at 100% demand must be at
least _____. -
correct answer ✅60A
Using the VA/linear foot method, the total VA that must be used in
a service calculation for a 50' show window is _____. -
correct answer ✅12,500VA
200VA per linear foot x 50' = 10,000VA
10,000VA x 1.25 = 12,500VA
Before it is considered a continuous load, a load must operate for at
least how many hours without interruption? -
correct answer ✅3
When making service calculations for multi-family dwellings,
additional demand factors must be applied to the portion of the
, Electrical: NEC Level 4, Entire First
Semester Exam Questions And Answers
neutral load greater than _____. -
correct answer ✅200A
In most cases, feeder conductor size is adjusted when _____. -
correct answer ✅there are more than three current-carrying
conductors in the raceway
The rules governing the design of circuits supplying power to boats
is covered in _____. -
correct answer ✅NEC Article 555
When calculating the service requirement for a particular building,
the first step is to _____. -
correct answer ✅determine the floor area of the building
If a store lighting load is 14,000VA (continuous), which of the
following must be used for the circuit calculation? -
correct answer ✅17,500VA
1.25 x 14,000VA = 17,500VA
Semester Exam Questions And Answers
The minimum ampacity for a feeder supplying ten 30A shore power
receptacles in a marina is _____. -
correct answer ✅120A
10 x 30A x 120V = 36,000VA
36,000VA x 0.8 = 28,800VA
28,000VA ÷ 240V = 120A
The smallest size locking and grounding type receptacle that may
be used to provide shore power for boats is _____ -
correct answer ✅30A
Refer to Figure 1. What is the total load a feeder serving four 2hp
motors, three 5hp motors, one 15hp motor, and one 25hp motor?
All motors are 208V. -
correct answer ✅219.8A
Use of the 100' tap rule is limited to installation in high-bay
manufacturing buildings with wall heights over _____. -
correct answer ✅35 feet
,Electrical: NEC Level 4, Entire First
Semester Exam Questions And Answers
What is the load for 40 non-dwelling unit receptacles? (Assume
that the load is not continuous.) -
correct answer ✅7,200VA
180VA per receptacle x 40 receptacles = 7,200VA
The interior lighting load for a school building with 175,000 square
feet of floor space is _____. -
correct answer ✅525,000VA
175,000 ft2 x 3VA/ft2 = 525,000VA
NEC Table 220.12 requires a minimum general lighting load for
office buildings to be based on _____. -
correct answer ✅3-1/2 VA/ft2
What is the feeder ampacity for a three-phase, 120/208V subpanel
with a connected load of 84,563VA? -
correct answer ✅235A
I = VA ÷ (V x √3) = 84,563VA ÷ (208V x 1.732) = 235A
A farm has three buildings with loads of 82A, 65A and 15A. What is
the total demand load? Assume that there are no dwellings or
,Electrical: NEC Level 4, Entire First
Semester Exam Questions And Answers
motors, and each building is an independent single load. -
correct answer ✅117A
(82A x 1) + (60A x 0.5) + [(5A +15A) x 0.25] = 82A + 30A + 5A = 117A
When performing load calculations for farm buildings, the load that
must be included in the calculation at 100% demand must be at
least _____. -
correct answer ✅60A
Using the VA/linear foot method, the total VA that must be used in
a service calculation for a 50' show window is _____. -
correct answer ✅12,500VA
200VA per linear foot x 50' = 10,000VA
10,000VA x 1.25 = 12,500VA
Before it is considered a continuous load, a load must operate for at
least how many hours without interruption? -
correct answer ✅3
When making service calculations for multi-family dwellings,
additional demand factors must be applied to the portion of the
, Electrical: NEC Level 4, Entire First
Semester Exam Questions And Answers
neutral load greater than _____. -
correct answer ✅200A
In most cases, feeder conductor size is adjusted when _____. -
correct answer ✅there are more than three current-carrying
conductors in the raceway
The rules governing the design of circuits supplying power to boats
is covered in _____. -
correct answer ✅NEC Article 555
When calculating the service requirement for a particular building,
the first step is to _____. -
correct answer ✅determine the floor area of the building
If a store lighting load is 14,000VA (continuous), which of the
following must be used for the circuit calculation? -
correct answer ✅17,500VA
1.25 x 14,000VA = 17,500VA
