Page "Electrical wiring in North America" Paragraph 0
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Typical wiring to three residential light switch es in a wall-mounted plastic box.
Plastic-sheathed power cable s enter the box at the rear and are secured by built-in cable clamps.
The switches have three wires, indicating they are part of a multiway switching system.
Wires are connected with twist-on wire connector s, where a green connector is used for the Ground ( electricity ) | grounding wires.
These switches are wrapped with electrical tape, which is not a usual practice in professionally-wired installations.
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