TN LLE Commercial Load Calculations 2

Question 1

Per NEC 220.12, what is the general lighting load demand factor for the first 12,500 VA of commercial office space?

Accepted Answer

100%

Answer

Per NEC Table 220.42, the first 12,500 VA of general lighting for commercial occupancies uses a 100% demand factor.

Question 2

When calculating the service load for a commercial building, receptacle outlets are calculated at how many VA per outlet per NEC 220.14(I)?

Accepted Answer

180 VA

Answer

NEC 220.14(I) assigns 180 VA per receptacle outlet for general-purpose receptacles in commercial occupancies.

Question 3

What is the demand factor applied to the first 10 kW of commercial kitchen equipment loads per NEC Table 220.56?

Accepted Answer

Demand factor depends on number of equipment units, not a fixed kW threshold

Answer

NEC Table 220.56 provides demand factors for commercial kitchen equipment based on the number of units, not a fixed kW threshold.

Question 4

For a 10,000 sq ft commercial office, what is the minimum general lighting load before demand factors are applied?

Accepted Answer

It depends on the specific use designation in Table 220.12

Answer

The unit lighting load varies by occupancy type. NEC Table 220.12 assigns different VA per square foot values for different occupancy types.

Question 5

When performing a commercial load calculation, the largest motor in the building gets what additional demand applied per NEC 220.50?

Accepted Answer

25% of its full-load current added

Answer

Per NEC 220.50, the feeder or service must include 25% of the highest-rated motor load in addition to the total calculated load.

TN LLE - Tennessee Limited Licensed Electrician Practice Test