You will be called on to troubleshoot a number of elusive electrical issues. The most common of these is finding and repairing a circuit that lost a neutral somewhere along the way.
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This video explains three-way switching configurations and how to wire them.
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This video demonstrates more challenging configurations such as the a 3-way tail end as well as a funky 3-way tapping method.
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This video demonstrates the basic needs a switch must have to operate a light or piece of equipment.
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