1
Load calculation Feeders and services Level 4 Module 1
Questions with Answers (100% Correct Answers)
What is the demand factor allowed by the NEC® for calculating the
neutral conductor size for electric range load? Answer: 70%
Using the VA/linear foot method, the total VA that must be used in a
service calculation for a 50' show window is Answer: 12,500VA
Before it is considered a continuous load, a load must operate for at
least how many hours without interruption? Answer: 3
Which of the following factors does not affect conductor ampacity
adjustments? Answer: Number of phase
If a continuous connected load totals 120A, what is the minimum
current-carrying capacity required for the feeder? Answer: 150A
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'? Answer: 79.60
© 2025 All rights reserved
, 2
Which of the following lighting loads would be used in a residence
that is 1,650 sq ft? Answer: 4,950VA
What is the load for 40 non-dwelling unit receptacles? (Assume that
the load is not continuous.) Answer: 7,200VA
The minimum service rating for a residential service is Answer: 100A
Residential small appliance circuit must be rated at Answer: 1,500VA
Use of the 100' tap rule is limited to installation in high-bay
manufacturing buildings with wall heignt over Answer: 35 feet
Which part of a residential lighting and small appliance load must be
rated at 35% for service calculations? Answer: The next 177,000VA
If a store lighting load is 14,000VA (continuous), which of the
following must be used for the circuit calculation? Answer: 17,500VA
In most cases, feeder conductor size is adjusted when Answer: there
are more than three current-carrying conductors in the raceway
© 2025 All rights reserved
Load calculation Feeders and services Level 4 Module 1
Questions with Answers (100% Correct Answers)
What is the demand factor allowed by the NEC® for calculating the
neutral conductor size for electric range load? Answer: 70%
Using the VA/linear foot method, the total VA that must be used in a
service calculation for a 50' show window is Answer: 12,500VA
Before it is considered a continuous load, a load must operate for at
least how many hours without interruption? Answer: 3
Which of the following factors does not affect conductor ampacity
adjustments? Answer: Number of phase
If a continuous connected load totals 120A, what is the minimum
current-carrying capacity required for the feeder? Answer: 150A
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'? Answer: 79.60
© 2025 All rights reserved
, 2
Which of the following lighting loads would be used in a residence
that is 1,650 sq ft? Answer: 4,950VA
What is the load for 40 non-dwelling unit receptacles? (Assume that
the load is not continuous.) Answer: 7,200VA
The minimum service rating for a residential service is Answer: 100A
Residential small appliance circuit must be rated at Answer: 1,500VA
Use of the 100' tap rule is limited to installation in high-bay
manufacturing buildings with wall heignt over Answer: 35 feet
Which part of a residential lighting and small appliance load must be
rated at 35% for service calculations? Answer: The next 177,000VA
If a store lighting load is 14,000VA (continuous), which of the
following must be used for the circuit calculation? Answer: 17,500VA
In most cases, feeder conductor size is adjusted when Answer: there
are more than three current-carrying conductors in the raceway
© 2025 All rights reserved
