When the electrical source originates at a light fixture and it’s controlled from a remote location, a switch loop is used. The circuit pictured here is wired with 2-conductor cable running from the light to the switch location. The white cable wire in this switch loop is wrapped with black tape and connected to the bottom terminal on SW1 and the hot source at the light. The black wire is connected to the top terminal on SW1 and the hot terminal on the light fixture. The neutral from the source is connected directly to the neutral terminal on the light.
If the switch is good and things still don’t work, check the wiring to be sure the hot source is connected to a common terminal and the light fixture hot is connected to a common terminal. Likewise, be sure the traveler terminals are connected between switches only and not to any hot wires or the load.
Here a single-pole switch controls the electricity to a light fixture. The source is at the switch and 2-conductor cable runs from there to the light. The source hot wire is connected to the bottom terminal on the switch and the top terminal is connected to the black cable wire. The neutral wire from the source is spliced to the white cable wire and continues on to the light. At the light, the white wire connects to the neutral terminal and the black wire connects to the hot.
In this diagram the electrical source is at the first switch and the light is located at the end of the circuit. Three-wire cable runs between the switches and 2-wire cable runs to the light. The black and red wires between SW1 and SW2 are connected to the traveler terminals. The hot source is connected to the common terminal on SW1, and the common terminal on SW2 connects to the hot terminal on the light.
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