Three types of light switch, how they are used, and a look inside each type.

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More on lighting circuits:
Part 1:    • Lighting Circuits Part 1  
Part 2:    • Lighting Circuits Part 2 - Wiring Mul...  
Part 3:    • Lighting Circuits Part 3 - Fans, Moti...  
Lighting circuits in detail: http://xo4.uk/?g42

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