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.
Get power from light switch.
More about electrical wiring for switches for more information about light switch wiring.
A typical source of power would be from an existing wall outlet in the same area or room.
Electrical switches typically have 110 volt power connected directly from the circuit panel.
Once the power source has been located a cable will need to be installed from that location to the location of the new light switch.
You do not want the switch to control the outlet.
The switch serves to cut the power from reaching the light switch.
This wire is needed to complete the circuit.
The switch will pass the electricity from the panel to a light or ceiling fan whenever the light switch.
Flipping the switch interrupts the flow of electricity to the light turning it off and on.
In this application the gfci outlet has the power entering the line side and extends through the gfci outlet and is fed out to the circuit from the load side of the gfci outlet.
The hot black wire from the power source travels through the switch and from there to the light.
Run 14 2 with ground sheathed electrical cable from.
The answer to this depends on how the existing circuit is wired.
You just want to put power to the switch then onto a light.
The ground wire sometimes in a green jacket should be connected to your switch and to your lights.
Turn the power off at the breaker.