Load calculation Feeders and services Level 4 Module 1
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1. What is the demand factor allowed by the NEC for calculating the
neutral conductor size for electric range load?: 70%
2. Using the VA/linear foot method, the total VA that must be used in a
service calculation for a 50' show window is: 12,500VA
3. Before it is considered a continuous load, a load must operate for at
least how many hours without interruption?: 3
4. Which of the following factors does not affect conductor ampacity
adjust- ments?: Number of phase
5. If a continuous connected load totals 120A, what is the minimum
cur- rent-carrying capacity required for the feeder?: 150A
6. What is the load center length for a tapped feeder with loads of 120A at
50', 110A at 60', 75A at 90', and 70A at 150'?: 79.60
7. Which of the following lighting loads would be used in a residence that
is 1,650 sq ft?: 4,950VA
8. What is the load for 40 non-dwelling unit receptacles? (Assume that the
load is not continuous.): 7,200VA
9. The minimum service rating for a residential service is: 100A
10.Residential small appliance circuit must be rated at: 1,500VA
11.Use of the 100' tap rule is limited to installation in high-bay
manufacturing buildings with wall heignt over: 35 feet
12.Which part of a residential lighting and small appliance load must be
rated at 35% for service calculations?: The next 177,000VA
13.If a store lighting load is 14,000VA (continuous), which of the
following must be used for the circuit calculation?: 17,500VA
14.In most cases, feeder conductor size is adjusted when: there are more
than three current-carrying conductors in the raceway
15.When calculating the service requirement for a particular building, the
step is to: determine the floor area of the building
16.What is the feeder ampacity for a three-phase, 120/208V subpanel with
a connected load of 84,563VA?: 235A
17.Which part of a residential lighting and small appliance load must be
rated at 35% for servives:
18.An optional method for determining feeder to schools is covered in:
NEC Section 220.86
19.Refer to the figure above. What is the total load of a feeder serving
four 230V motors rated 5hp, 15hp, 20hp, and 40hp?: 241.2
20.Refer to the figure above. Calculate the minimum ampacity for a
feeder serving the following 460V motor: 10hp, 20hp, and 30hp.: 91A
1
Study online at https://quizlet.com/_8p0w11
1. What is the demand factor allowed by the NEC for calculating the
neutral conductor size for electric range load?: 70%
2. Using the VA/linear foot method, the total VA that must be used in a
service calculation for a 50' show window is: 12,500VA
3. Before it is considered a continuous load, a load must operate for at
least how many hours without interruption?: 3
4. Which of the following factors does not affect conductor ampacity
adjust- ments?: Number of phase
5. If a continuous connected load totals 120A, what is the minimum
cur- rent-carrying capacity required for the feeder?: 150A
6. What is the load center length for a tapped feeder with loads of 120A at
50', 110A at 60', 75A at 90', and 70A at 150'?: 79.60
7. Which of the following lighting loads would be used in a residence that
is 1,650 sq ft?: 4,950VA
8. What is the load for 40 non-dwelling unit receptacles? (Assume that the
load is not continuous.): 7,200VA
9. The minimum service rating for a residential service is: 100A
10.Residential small appliance circuit must be rated at: 1,500VA
11.Use of the 100' tap rule is limited to installation in high-bay
manufacturing buildings with wall heignt over: 35 feet
12.Which part of a residential lighting and small appliance load must be
rated at 35% for service calculations?: The next 177,000VA
13.If a store lighting load is 14,000VA (continuous), which of the
following must be used for the circuit calculation?: 17,500VA
14.In most cases, feeder conductor size is adjusted when: there are more
than three current-carrying conductors in the raceway
15.When calculating the service requirement for a particular building, the
step is to: determine the floor area of the building
16.What is the feeder ampacity for a three-phase, 120/208V subpanel with
a connected load of 84,563VA?: 235A
17.Which part of a residential lighting and small appliance load must be
rated at 35% for servives:
18.An optional method for determining feeder to schools is covered in:
NEC Section 220.86
19.Refer to the figure above. What is the total load of a feeder serving
four 230V motors rated 5hp, 15hp, 20hp, and 40hp?: 241.2
20.Refer to the figure above. Calculate the minimum ampacity for a
feeder serving the following 460V motor: 10hp, 20hp, and 30hp.: 91A
1
