Licensed Electrical Contractor Load Calculation and Services 2

Question 1

When applying the optional calculation method for a dwelling unit, what is the minimum load in volt-amperes applied to the first 10 kVA of all other loads?

Accepted Answer

100%

Answer

80%

Answer

40%

Answer

125%

Question 2

A 240V, single-phase service feeds a 10 kW electric range. Using the standard calculation method, what demand load from NEC Table 220.55 applies for one range?

Accepted Answer

8 kW

Answer

10 kW

Answer

12 kW

Answer

6 kW

Question 3

What is the minimum size service required for a single-family dwelling under NEC 230.79?

Accepted Answer

100 amperes

Answer

60 amperes

Answer

150 amperes

Answer

200 amperes

Question 4

When calculating feeder neutral load for a residential service, how is the unbalanced load between lines reduced per NEC 220.61?

Accepted Answer

The portion of neutral load above 200A may be reduced by 70%

Answer

The neutral is sized at 100% of the maximum unbalanced load

Answer

The neutral load is always equal to the phase load

Answer

The neutral load is reduced by 25% for all loads

Question 5

A commercial occupancy has 50,000 VA of receptacle load. What demand factor applies to the receptacle load above 10,000 VA per NEC Table 220.44?

Accepted Answer

50%

Answer

100%

Answer

75%

Answer

25%

Question 6

Which NEC article governs services, including the number of service disconnects permitted?

Accepted Answer

NEC Article 230

Answer

NEC Article 215

Answer

NEC Article 225

Answer

NEC Article 240

Question 7

When sizing a service for a building with multiple HVAC units, how are the hermetic refrigerant motor-compressor loads treated per NEC 440.6?

Accepted Answer

At the rated-load current or branch-circuit selection current, whichever is greater

Answer

At 80% of full-load current

Answer

At 125% of the largest motor plus 100% of all others

Answer

At 75% of nameplate current