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Example 1:

A two-story house has a first floor measuring fifty feet wide by 35 feet deep. It has a second floor measuring 40 feet wide and thirty feet deep. What is the square footage of the house? Calculate the lighting load of the structure, then provide the minimum number of 15 amp lighting branch-circuits required for this house.

Step 1: Find the total square footage

First Floor

Second Floor

Total Square Footage = _________ .

Step 2: Find the lighting load

Step 3: Minimum # of 15 amp circuits


Think – Pair – Share

You will work with a partner. Each of you will do one of these problems. When you are finished, turn to your partner and explain your answer.

1. A ranch house has a width of 88 feet and a length of 43 feet. What is the total square footage? Calculate the General Lighting Load, and the minimum number of 15 amp branch circuits for this dwelling.

2. A ranch house has a width of 92 feet and a length of 49 feet. What is the total square footage? Calculate the General Lighting Load, and the minimum number of 15 amp branch circuits for this dwelling.


Example 2:

An electrician needs to wire the perimeter of a very unique addition. The drawing is below. What is the amount of wire he will need to purchase to wire the perimeter of this construction? In addition to the wire he needs, he has decided to purchase an extra 20 feet of wire to have on hand.

c = 37 ft

a

b = 24 ft

Step 1: We need to find the value of the variable a.

Pythagorean Theorem

Step 2: We need to find the circumference of ½ of a circle.

Circumference of a semicircle:

Circle = 2πr or πd Semicircle = ____________.

Solve the equation:

Step 3: Find the perimeter of the entire addition.

The total perimeter is ______.

You must then add _____of wire and purchase ________.


You will work with a partner to complete the following problem.

An electrician needs to wire the perimeter of a very unique addition. The drawing is below. What is the amount of wire he will need to purchase to wire the perimeter of this construction? In addition to the wire he needs, he has decided to purchase an extra 10 feet of wire to have on hand.

c = 60 ft

a

b = 32 ft


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