Http://waterheatertimer.org/images/lights-400.jpg
The link above shows basic wiring plan for adding a switch
The switch always turns the Hot wire on-and-off.
When selecting wire size, use same size that connects to plug
So if plug has a yellow-sheathed cable, then use #12 wire
If plug has white sheathed cable, use #14 wire
#14 is smaller wire than #12
http://waterheatertimer.org/RomexC.html
The link above shows how to install wires in octagon box
Your light fixture always attaches to octagon box.
Octagon box can be round, it can be made of plastic.
The box can be nailed to any surface.
http://waterheatertimer.org/Install-owb.html
The link above shows how to add a switch box in existing wall
They also sell octagon boxes that insert into existing wall or ceiling.
http://waterheatertimer.org/How-to-twist-electric-wire.html
The link above shows some basic electrical techniques and
links to wire nuts and wire size
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