From: remove.budnews@isp.com   
      
   On 3/25/2013 9:29 AM, Rich. wrote:   
   >   
   >  wrote in message   
   > news:3c3643fc-d796-4fec-9232-8844e2fec903@googlegroups.com...   
   > 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.   
   >   
   >   
   > First off the disclaimer: The newer code requirement is for GFI outlets   
   > in bathrooms to be 20-amp and also separate from the lighting circuit.   
   > So if you wish to do it the correct way, you have to run a 20-amp line   
   > from the panel.   
   >   
   > If you wish to do it the way you're intending, then some simple   
   > re-splicing is in order. First turn off the power, then take the white   
   > wire going to the fan switch and pigtail 3 black wires to it. Leave the   
   > existing black wires on each switch alone. Take the white wire off the   
   > switch for the vanity light. Connect one of the black pigtail wires to   
   > each switch, (leaving one for the moment.) Either up in the attic or   
   > behind the vanity light you're going to find the main splice for the   
   > bathroom wiring.   
      
   Not likely there is a "main splice for the bathroom wiring".   
      
   The wiring method that makes sense is a 2-wire romex from the vanity   
   light and a 2-wire from the fan.   
      
   The NEC requires all wires for a run be in the same cable or raceway.   
   You can't get the hot from the fan and the neutral from the light.   
      
   There is a duplicate question from a long thread in alt.home.repair   
   which addresses the issues. The OP probably doesn't like the answers he   
   is getting there.   
      
   > In this splice you will have to take the white wire   
   > that ran to the vanity light switch off of the hot wire splice and   
   > splice it to the neutral wires. This leaves you with one black pigtail   
   > wire and one white neutral wire back at the switches. Once power is   
   > restored, these 2 wires will supply power to the GFI. I'm sure you can   
   > figure out that all of the grounds go together and to each device.   
   >   
      
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