Multiple Light Switch Wiring - Electrical 101
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Multiple Light Switches Wiring

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With conventional light switch wiring using NM cable, the cable supplies line voltage from the electrical panel to a light switch outlet box. Another NM cable connects the first outlet box to the next box(es) and so on until you reach the end of the chain. Before 2011, the “end of the chain” switch was commonly wired using alternate (California style) wiring.

Diagrams shown on this page are simplified for clarity. Electrical outlet boxes can have numerous NM cables going in and out. See “Actual Switch Box Wiring Diagram” below.

Ground connection diagram is shown separately.

Multiple Light Switch Wiring Diagram

Multiple Light Switch Wiring Diagram

Two Switch Box Wiring Image

Two Switch Box Wiring Image

It is not unusual for the wires inside of an outlet box to be covered by spray paint from the initial construction of a dwelling.