PaPaPeng writes:
On Tue, 01 Nov 2005 18:05:41 -0600, wrote:

WACO, Texas (AP) -- A pastor performing a baptism was electrocuted
inside his church Sunday morning after adjusting a nearby microphone
while standing in water, a church employee said.


Doesn't sound right. The juice to drive a microphone is in the low DC
voltage value and runs on milliamps. Its even weaker than the current
that drives the big speakers. Water or no water I have never come
across anyone being zapped by a frayed microphone wire let alone
suffer injury by one.

PA systems powered by miswired mains have killed more than a few
musicians over the years, so believe it.

Though microphone voltages are only in the millivolts range, they are
plugged into PA's that are plugged into the electrical system. If you
have hot and neutral reversed on that system, and someone using a
floating 3-to-2 prong converter, then your ground connection of the
XLR jack to the microphone can be nice and wavy. Grab the body of
that microphone and stand in the baptismal fountain with a floor drain
to ground, and sadly, you can meet god sooner than you ever wanted.

There are various ways you end up with AC on the microphone ground.
The electrical isolation of an RF interface in a wireless mic is
entirely the way to go for such duty.

Best Regards,
--
Todd H.
http://www.toddh.net/