Chapter 13. Controlling AC

Switching AC appliances requires an understanding of the dangers and special precautions that must be used when dealing with high voltages. In this chapter, you will learn how to safely control AC devices using electromechanical and solid-state relays, as well as techniques such as zero-crossing switching.

High Voltage Can Kill

Every year, domestic AC electricity kills hundreds of people in the United States alone. Many more are badly burned and many house fires are started by faulty wiring. The domestic AC supply is high voltage and capable of supplying large currents.

When working on the practical section of this chapter, never work on a “hot” (live) line. I like to see the plug of whatever I am working on in front ...

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