Licensed Electrical Contractor Load Calculation and Services 3

Question 1

Per NEC 220.12, what is the general lighting load in VA per square foot for a bank?

Accepted Answer

3.5 VA/sq ft

Answer

1.0 VA/sq ft

Answer

2.0 VA/sq ft

Answer

5.0 VA/sq ft

Question 2

How must the largest motor load be treated when included in a feeder or service calculation?

Accepted Answer

Add 25% of its full-load current to the total

Answer

Use 80% of its nameplate rating

Answer

Exclude it from the demand factor calculation

Answer

Apply a 50% demand factor to it

Question 3

A 120/240V single-phase service supplies an electric dryer rated at 5,000 W. What load is used in the standard residential calculation?

Accepted Answer

The nameplate rating or 5,000 VA, whichever is larger

Answer

5,000 W

Answer

5,000 W or 5,000 VA, whichever is larger

Answer

4,000 W after demand factor

Question 4

What is the maximum number of service disconnecting means allowed for a single service?

Accepted Answer

6

Answer

2

Answer

4

Answer

8

Question 5

Under the standard calculation for a 2,400 sq ft dwelling, what is the general lighting and receptacle load before demand factors (using 3 VA/sq ft)?

Accepted Answer

7,200 VA

Answer

5,400 VA

Answer

9,600 VA

Answer

3,000 VA

Question 6

The demand factor for the first 3,000 VA of a residential lighting load is:

Accepted Answer

100%

Answer

50%

Answer

75%

Answer

35%

Question 7

When computing a service load for a multi-family dwelling with 20 units, what demand factor applies to the lighting load between 3,001 VA and 120,000 VA per NEC Table 220.42?

Accepted Answer

35%

Answer

100%

Answer

75%

Answer

50%