   Chapter 1, Problem 15R

Chapter
Section
Textbook Problem

You will learn in Chapter 3 that residential lighting loads are based on 3 volt-amperes per ft2 (33 volt-amperes per m2). Determine the minimum lighting load required for an area of 186 m2. Do calculations for both feet squared and meters squared so you can see the difference in answers. To convert meters squared to feet squared, refer to Table 1-8.

To determine

Find the minimum lightning load required for the given area.

Explanation

Given data:

Rating of residential lightning load per unit area (SA) is 3VAft2 or 33VAm2.

The area for which the lightning load is to be calculated (A) is 186m2.

Formula used:

Write the expression for rating of the lightning load as follows:

S=SAA (1)

Here

SA is the lightning load per unit area.

A is the area for which the lightning load is to be calculated.

Calculation:

The minimum lightning load when the area is considered in terms of square feet is as follows:

Refer Table 1-8 in the textbook and write the conversion factor between square feet and square meter as follows:

1m2=10.764ft2

Use the conversion factor and convert the given area in terms of square meter as follows:

A=186m2=(186)(10.764ft2)=2002.104ft2

Substitute 3VAft2 for SA and 2002

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