On Jul 7, 1:43 pm, "M PRESSMAN" wrote:
I just replaced a 3-way switch, and when I was testing, I noticed that there
was 30 volts (Radio Shack analog meter) at the light socket when the
switches were off. I tried using one of the little idiot lights that glow
with voltage, and indeed, it glowed weakly. The light and the 2 3-way
switches work perfectly though. This circuit is fed by old knob and tube
wiring. Should I worry that something nasty is going on?

Thanks,
Michael

You could have a shared neutral. I have one in my house and I have to
turn off the breakers for both circuits to avoid a situation like you
describe. The breakers should in fact be ganged. (It's on my list!)

See this site: http://www.thecircuitdetective.com/twocircuit.htm