CME Advanced Load Calculations Questions and Answers

Question 1

A feeder supplies power to three continuous-duty motors with full-load currents of 40A, 30A, and 25A, and a non-continuous, non-motor load of 50A.
What is the minimum required ampacity for the feeder conductors?

Accepted Answer

165A

Answer

155A

Answer

181.25A

Answer

145A

Question 2

An office building requires a service calculation. The general lighting load is determined to be 80,000 VA (continuous), and the general-use receptacle load is 45,000 VA, of which 12,000 VA is continuous. What is the total calculated demand load for lighting and receptacles?

Accepted Answer

128,000 VA

Answer

125,000 VA

Answer

148,250 VA

Answer

115,000 VA

Question 3

A 20-unit multifamily dwelling is being calculated using the optional method per NEC 220.84. Each unit contains 1,200 sq ft of living space, two small-appliance circuits, one laundry circuit, a 12 kW range, a 5 kW water heater, and a 4.5 kW dryer. What is the total connected load for one unit before applying the demand factor from Table 220.84?

Accepted Answer

35,600 VA

Answer

31,100 VA

Answer

29,600 VA

Answer

25,100 VA

Question 4

A commercial kitchen is equipped with seven pieces of thermostatically controlled cooking equipment with a total connected load of 95 kW. According to NEC Table 220.56, what is the calculated demand load for the service feeder?

Accepted Answer

61.75 kW

Answer

95 kW

Answer

76 kW

Answer

52.25 kW

Question 5

What is the calculated demand load for a single 14 kW household electric range on a branch circuit?

Accepted Answer

8.4 kW

Answer

14 kW

Answer

8.8 kW

Answer

8.0 kW

Question 6

Which of the following conditions must be met to use the optional calculation method for a multifamily dwelling service as described in NEC 220.84?

Accepted Answer

Each dwelling unit must be supplied by not more than one feeder.

Answer

The building must contain five or more dwelling units.

Answer

Each dwelling unit must be equipped with gas cooking appliances.

Answer

The calculation can be used if building has common area laundry facilities.

A feeder supplies power to three continuous-duty motors with full-load currents of 40A, 30A, and 25A, and a non-continuous, non-motor load of 50A.What is the minimum required ampacity for the feeder conductors?

A feeder supplies power to three continuous-duty motors with full-load currents of 40A, 30A, and 25A, and a non-continuous, non-motor load of 50A.
What is the minimum required ampacity for the feeder conductors?