What Bruce said, although I wouldn't add a receptacle to a lighting
circuit.. keeping them separate is more sensible.

If there is an existing wall receptacle in the room (or in the bathroom wall
but facing into an adjacent space), I'd replace it with a GFCI version, and
extend the circuit from the GFCI to the conveniently placed location (up
near the countertop etc).
Receptacles downstream/after the GFCI receptacle have the same protection if
installed properly.

Otherwise, I'd add a 12-2 plus ground circuit from the service box and
terminate with a GFCI receptacle located in a convenient location (leaving a
pigtail at a convenient location on the protected side of the GFCI, nutted
and placed in a secured handy box will provide the convenience of easy
future expansion of the GFCI circuit).

--
WB
..........


"stryped" wrote in message
...
I need to add a gfi outlet to my wifes bathroom. I want to add it to the
current light switch box. This box currently has two switches, one for the
fan,light and one for the vanity light. Each switch has a white wire, a
black wire, and a ground. When checking with a voltmeter, the white wire on
both switches always has power. Each black wire only has power when the
switch is turned on. I am assuming the white wire is the power wire. Can I
take these white wires off the switches, connect them to the top and bottom
"hot" terminal on the gfi outlet, then feed the switches from both terminals
on the other side of the gfi? When I did this messing around with the
switches, everything worked properly. I just thought that the black wire was
always the constant power wire.