FREE Journeyman Electrician’s Service and Feeder Calculations Questions and Answers

Question 1

Using the standard calculation method, what is the total service load for a 2,000 sq. ft. single-family dwelling with a 12 kW electric range and a 5 kW electric dryer?

Accepted Answer

18,625 VA

Answer

23,500 VA

Answer

22,625 VA

Answer

16,675 VA

Question 2

A 120/240V feeder supplies a non-continuous load of 10,000 VA from line-to-neutral lighting and receptacles, plus one 14 kW household electric range. What is the calculated neutral load for this feeder?

Accepted Answer

16,160 VA

Answer

18,800 VA

Answer

15,600 VA

Answer

13,160 VA

Question 3

A feeder in a commercial kitchen supplies five pieces of thermostatically controlled kitchen equipment with a total connected load of 41 kW. What is the calculated demand load for the feeder?

Accepted Answer

28.7 kW

Answer

41.0 kW

Answer

32.8 kW

Answer

26.7 kW

Question 4

A new single-family dwelling is supplied by a 200A, 120/240V single-phase service. What is the minimum size for the ungrounded copper service-entrance conductors with THWN insulation permitted by the NEC?

Accepted Answer

2/0 AWG

Answer

3/0 AWG

Answer

1/0 AWG

Answer

4/0 AWG Aluminum

Question 5

A feeder supplies 15 individual dwelling units in an apartment building. The calculated load for each unit is 14 kVA. Using the optional method, what is the calculated demand load for the feeder?

Accepted Answer

88.2 kVA

Answer

210.0 kVA

Answer

92.4 kVA

Answer

94.5 kVA

Question 6

What is the calculated general lighting load after applying demand factors for a 50,000 sq. ft. office building?

Accepted Answer

128,500 VA

Answer

175,000 VA

Answer

122,500 VA

Answer

93,750 VA