NEC Load Calculation Applications 2

Question 1

When calculating the demand load for a commercial kitchen with six 5 kW ovens, what demand factor applies to the first 3 ovens per NEC Table 220.56?

Accepted Answer

65%

Answer

100%

Answer

55%

Answer

80%

Question 2

A 200-ampere, 240-volt single-phase service supplies a dwelling. What is the net computed load in kVA that represents the full-load capacity of this service?

Accepted Answer

48 kVA

Answer

24 kVA

Answer

40 kVA

Answer

200 kVA

Question 3

Under NEC 220.14(J), what is the unit load per outlet used for calculating branch-circuit loads for show-window lighting in a commercial occupancy?

Accepted Answer

150 VA per linear foot

Answer

180 VA per linear foot

Answer

200 VA per linear foot

Answer

125 VA per linear foot

Question 4

For optional calculation of a dwelling unit per NEC 220.82, which load is NOT included in the total connected load before applying demand factors?

Accepted Answer

Electric vehicle supply equipment

Answer

Air conditioning equipment

Answer

Lighting at 3 VA/sq ft

Answer

Small appliance branch circuits at 1500 VA each

Question 5

A 240-volt, 30-ampere dryer circuit serves a single household dryer. Per NEC 220.54, what is the minimum load to use when calculating the feeder demand for one dryer?

Accepted Answer

5,000 VA

Answer

7,200 VA

Answer

6,000 VA

Answer

4,500 VA

Question 6

When using the standard method to calculate a dwelling service, at what square footage threshold does the 3 VA per sq ft lighting load for the first portion end and require a different demand treatment under NEC Table 220.42?

Accepted Answer

The entire load uses demand factors; there is no square footage threshold

Answer

3,000 sq ft

Answer

2,000 sq ft

Answer

5,000 sq ft

Question 7

A three-phase, 208Y/120V panel serves 12 identical 1,500 VA single-phase receptacle loads balanced across phases. What is the total three-phase feeder load before demand factors?

Accepted Answer

18,000 VA

Answer

6,000 VA

Answer

12,000 VA

Answer

54,000 VA