Excerpts from CHAPTER 6
BEFORE YOU CAN WIRE a building, you must learn how switches,
receptacles, sockets and other devices are properly connected to each
other with wire to make a complete electrical system called a circuit--the
path along which current flows. There are instructions and several wiring
diagrams in this chapter that cover three-way and four-way switches.
Included here is an excerpt explaining the internal construction of
three-way switches and how they work.
The switch used for controlling a light from one point is known as a "single pole"
switch. "Three way" switches allow you to control a light from two points (not three,
despite the name). With three-way switches you can turn a hall light on or off from
upstairs and downstairs, or a garage light from house and garage, or a yard light from
house and barn. Such switches have three different terminals for wires. Their internal
construction is similar to Fig. 6-13. In one position of the handle, terminal A is
connected inside the switch to terminal C; in the other position, terminal A is
connected to terminal B. Usually, the common terminal A is identified by being a darker
color than the other terminals which are natural brass.
The rest of the chapter covers--
Wiring diagrams for receptacle outlets
Three-way and four-way switches
Chapter 2. Planning Your Electrical Installation
Chapter 13. Modernizing Old Wiring
Chapter 19. Troubleshooting and Repairs
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Park Publishing, Inc.
Softcover, 5 1/2 x 8 1/2 inches, 256 pages, 228 illustrations
45th edition, May 2017