A house wiring diagram is usually provided within a set of design blueprints, and it shows the location of electrical outlets (receptacles, switches, light outlets, appliances), but is usually only a general guide to be used for estimating and quotation purposes.
This is the most common, and the easiest wiring diagram to follow of any of the wiring diagrams for a 3-way switch circuit. This wire diagram shows the wiring for source power into the first three way switch, then 3-wire cable to the next 3-way light switch, and then on to the light or light fixtures.
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