I went by my mother's house for dinner and she asked me to check out a
florescent closet light that wasn't working. She already installed a new
bulb and that didn't solve the problem.
I removed the cover at the fixture and connected my VOM and found 120v.
When I shut off the light switch, I had 2 volts.
Finding this somewhat unusual, I turned the switch back on and we cycled
through a couple of breakers. With the breaker in the off position, I
still had a couple of volts.
Mom's house is 20 years old and has two electrical panels (and 4
heating/cooling zones, but that's an entirely different story). One panel
is in the first floor laundry room, and the other panel is in the basement.
Every circuit on the basement panel I tested had somewhere between .5v and
5v with the breaker off. The main panel circuits had 0v.
I'm no expert on household electricals. I'm really curious where this
volt or two could be coming from. I'm not sure if it's normal either - I
would assume not. I also wouldn't be surprised to learn the demise of the
florescent fixture had something to do with it getting 2 volts pretty much
all the time.
For grins, I decided to air gap the switch - I removed it entirely and
capped off the hots. I was still seeing 2v at the closet light, which
makes even less sense now that the only things connected (at least, as far
as I could tell) were ground and neutral, and I was measuring that silly
2v between neutral and hot.