Add another line to 120V switch.
To begin, inside your switch box, there must be at least two cables.
Each cable has a black-wire and white-wire and bare ground wire.
If your box has only one cable, then you cannot use that for your junction.
OK, your box has 2 cables.
One cable comes from circuit breaker box. These are called Line wires. There is a Black Hot and White Neutral.
The other cable goes to light. These are called Load wires.
You are going to add a new cable with a black-wire and white-wire
In back of box, the white wires are twisted together and covered with wire nut.
These white wires are called Neutrals.
Add your new white wire to these other white wires.
The switch has 2 black wires. One black wire is the Hot line wire.
Add your new black wire to the switch screw that has the Hot.
Of course the switch has 2 black wires, so how do you know which is the Hot.
Turn light switch off, turn power ON, and test each black wire to bare ground wire.
Tester lights up on the Hot.
Review:
New white wire connects to other white wires that are twisted together and covered with wire nut.
New black wire connects to Hot wire.
Ground wires are connected together.
On your new receptacle, the black wire connects to brass screw, and white wire connects to silver screw.
Screws are color-coded to tell electrician how to wire.
http://waterheatertimer.org/Color-codewire.html
http://waterheatertimer.org/B220C.html
http://waterheatertimer.org/See-inside-main-breaker-box.html
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