Hello Trumpy,
I seem to remember something from my industrial days about how Wiggy's could detect a grounded or "dark" leg of an ungrounded three phase delta system. I can't remember the specifics but I remember the old timers telling me that my VOM was pretty much useless and would get me killed. The input impedence of a Wiggy is very low compared to a standard VOM, allowing it to detect voltages that a VOM does't even know are there.
I wish I would have paid more attention to these old sparky's but booze and women were all I cared about then.
