Also be sure the neutral from the source is connected to the neutral terminal at the light. A neutral wire will not be connected to the switches in these circuits, although some smart switches may make use of a neutral wire to operate the device.
Back at the lights the source neutral is connected to the neutral terminal on L1 and spliced with the white wire running between the fixtures. At each light it’s connected to the neutral terminal. At SW1 the red and white wires from the 3-wire cable running between switches function as the travelers with the white marked for hot using black tape or paint.
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.
This is the standard 15 amp 120 volt wall receptacle outlet wiring diagram. This is a polarized device. The long slot on the left is the neutral contact and the short slot is the hot contact. A grounded contact at the bottom, center is crescent shaped. Don’t use this receptacle when no ground wire is available.
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