What is the lighting load for a two-story, single-family dwelling unit with dimensions of 32' by 85'?

To calculate the lighting load for a two-story, single-family dwelling, one generally refers to the National Electrical Code (NEC) guidelines, specifically Article 220. For a dwelling, the general lighting load is typically calculated at a rate of 3 VA per square foot.

First, we determine the total square footage of the dwelling. The dimensions given are 32 feet by 85 feet, which results in:

32 ft x 85 ft = 2,720 square feet for one story.

Since it is a two-story dwelling, we multiply this area by 2:

2,720 sq ft x 2 = 5,440 square feet total.

Now, by applying the lighting load calculation of 3 VA per square foot:

5,440 sq ft x 3 VA/sq ft = 16,320 VA.

This calculation leads us to the correct choice as the lighting load for the specified dwelling. The figure of 16,320 VA reflects the appropriate application of the NEC guidelines for determining the lighting load in a residential setting, justifying the selected answer.