Load Calculations — Art. 220 (part 2)

Give the best answer.

1. Which of the following 15A 125V duplex receptacles on a two-family house counts as part of the general lighting load for the dwelling unit they’re connected to, instead of being taken as additional load? Assume they’re not in the actual dwelling unit living space.

a. The one for the garage door opener

b. The one in the siding on the outside wall, for occasional use as necessary

c. The one in the basement next to the panel, for general use

d. Two of the above

e. All of the above

f. None of the above

2. How many 20A branch circuits must you install to feed 80 ft of lighting track at a museum? There will be 50W pin spots every 4 ft (starting 2 ft from the beginning) for a long-term display of a series of 20 small paintings.

a. One

b. Two

c. Three

d. Four (feed at both ends)

3. For the load in Question 2, how much additional load must you allow for the feeder?

a. 7500VA

b. 6000VA

c. 1250VA

d. 1000VA

4. If you connect a receptacle located behind the refrigerator to its own 15A branch circuit, how much load must you include for the refrigerator in the service calculation for a new house?

a. None

b. 1200VA

c. 1500VA

d. No can do; it must be a 20A small appliance circuit.

5. A 16-unit condominium, with two bathrooms in each, will be wired with separate 20A branch circuits to each bathroom. How much additional load does this design decision impose?

a. 48kVA

b. 24kVA

c. 5760VA

d. None

6. If you install a heat pump at a new house with 18kVA of backup resistance heat to supplement a 30A compressor, what does that represent in terms of 240V feeder load in the optional calculation? Assume the heat is internally staged, but the compressor runs whenever called.

a. 68A

b. 75A

c. 105A

d. None of the above