I've ran into this situation a couple of times now and was wondering if any of you had any idea as to what is causing it.

Residential - After turning off a standard single pole 15A toggle switch (i.e. no pilot light), I still get about 15 Volts coming through to the outlet in the ceiling when changing a light or ceiling fan. When the circuit breaker is turned off, the voltage drops to zero. Considering that this has happened several times in several different homes, and considering that the standard switch is breaking the connection on the ungrounded wire, then I have to conclude that this stray voltage is coming through on the grounded (neutral) conductor. But why?

I have two theories. One, is that the voltage is being induced on the wire. The other is that at least two circuits are sharing a neutral and the voltage is being back-fed. What do you think??? [Linked Image]

Kevin