21 Jun
2013
21 Jun
'13
2:51 p.m.
On 06/19/2013 06:52 PM, Fred Cisin wrote:
. . . or you may be the ground.
I acquired an industrial PC some time back with a fairly high-end ATX
PSU in it (can't remember the brand, but it wasn't a consumer piece of
junk). As I touched the back of the unit, I could feel a "tingle" in my
fingers. A check with a DMM showed about 50VAC between the chassis and
neutral. At the AC socket, the reading was 0V or very close to it. The
AC cord checked out fine.
I haven't opened the PSU yet to find out what the source of the mystery
is, but I suspect that the wire going from the AC socket to chassis doesn't.
What I'm feeling is probably from the AC mains filter in the PSU.
So it does happen.
--Chuck