FREE NEC Load Calculations Questions and Answers

Question 1

An electrician is calculating the service load for a new 2,100 sq. ft. single-family dwelling.
Using the standard method, what is the calculated load for the general lighting and general-use receptacles before any demand factors are applied?

Accepted Answer

6,300 VA

Answer

4,500 VA

Answer

7,800 VA

Answer

3,000 VA

Question 2

When performing a standard load calculation for a dwelling unit, what is the MINIMUM total volt-ampere load that must be allocated for the small-appliance and laundry branch circuits?

Accepted Answer

4,500 VA

Answer

3,000 VA

Answer

1,500 VA

Answer

6,000 VA

Question 3

Using NEC Table 220.55, what is the calculated demand load for a single 13 kW household electric range for a service calculation?

Accepted Answer

8,400 VA

Answer

13,000 VA

Answer

8,000 VA

Answer

12,000 VA

Question 4

An electrician is calculating the feeder load for a multi-family dwelling with five identical apartments. Each apartment will have one electric clothes dryer with a nameplate rating of 4,800 watts. What is the total calculated demand load for the five dryers?

Accepted Answer

20,000 VA

Answer

24,000 VA

Answer

21,250 VA

Answer

25,000 VA

Question 5

For a standard calculation, which of the following loads are combined together before applying the demand factors from NEC Table 220.42?

Accepted Answer

General lighting, small-appliance circuits, and laundry circuit

Answer

General lighting, fixed appliances, and range load

Answer

Small-appliance circuits, laundry circuit, and HVAC load

Answer

General lighting, dryer load, and water heater load

Question 6

What is the minimum calculated general lighting load for a 12,000 sq. ft. office building before any demand factors are applied?

Accepted Answer

168,000 VA

Answer

36,000 VA

Answer

120,000 VA

Answer

42,000 VA