How To Wire A Light Switch Power Into Switch

This three way light switch wiring diagram shows how to do the light switch wiring and the light when the power is coming to the light fixture.

How to wire a light switch power into switch. First of all we should connect the ground wires to the box. The first thing you need to do is distinguish the line cable coming from the panel from the load cable which is the one going to the light fixture. Wiring a single pole light switch. The black caries the hot to the switch the red carries the hot back to the fixture.

The way a light switch is wired depends on whether the power comes into the light box or the switch box first. The power supply connects to the switch. The source is at the switch and 2 wire cable runs from there to the light. With the power coming to the switch and then going to the lights you will notice that there are two black wires two white wires and two ground wires bare wires.

Connect the black wire from the power supply to the switch and the white wire from the power supply to the white wire of the cable connected to the first light. The source hot wire is connected to a switch terminal and the other terminal is connected to the black cable wire. If power comes into the switch box first the neutral white line from the service panel and the white line that leads to the light are spliced together. Click the icons below to get our nec compliant electrical calc elite or electric toolkit available for android and ios.

In this diagram power enters the fixture box. Connect the black wire from the first light to the switch. Here a single pole switch controls the power to a light fixture. Light switch diagram power into light pdf 44kb back to wiring diagrams home.

If the light switch has a ground screw on it usually green and at the bottom of the switch connect it now. The black hot wire connects to the far right switch s common terminal. The electrical calc elite is designed to solve many of your common code based electrical calculations like wire sizes voltage drop. Assuming it is a steel box.

Power source directly to fixture when you want to add a switch to a light that is hot at the fixture you can run a new 3 wire cable from the fixture to a box containing the new switch.