NJATC Load Calculations 3

Question 1

Per NEC 430.22, at what percentage of the motor's full-load current rating must branch circuit conductors for a single motor be sized?

Accepted Answer

125%

Answer

100%

Answer

115%

Answer

150%

Question 2

When sizing feeder conductors for multiple motors per NEC 430.24, how is the largest motor's current contribution calculated?

Accepted Answer

At 125% of FLC

Answer

At 100% of FLC

Answer

At 115% of FLC

Answer

At 150% of FLC

Question 3

What is the power factor of a purely resistive circuit, such as one supplying only electric heating elements?

Accepted Answer

1.0

Answer

0.80

Answer

0.85

Answer

0.90

Question 4

What is the maximum calculated load capacity in kilowatts of a 100-ampere, 240-volt, single-phase service entrance?

Accepted Answer

24 kW

Answer

12 kW

Answer

18 kW

Answer

30 kW

Question 5

Per NEC 220.53, what demand factor may be applied when four or more fastened-in-place appliances (other than ranges, dryers, or HVAC) are served by the same feeder?

Accepted Answer

75%

Answer

100%

Answer

90%

Answer

50%

Question 6

Per NEC Table 220.42, what demand factor applies to general lighting loads above 12,500 VA in a commercial (non-dwelling) occupancy?

Accepted Answer

50%

Answer

100%

Answer

75%

Answer

35%

Question 7

When both electric heating and air conditioning are installed in a dwelling, which load is included in the service calculation per NEC 220.60?

Accepted Answer

The larger of the two non-coincident loads

Answer

The sum of both loads

Answer

The smaller of the two non-coincident loads

Answer

The average of both loads