Yes, I didn't explain that well.
The outlet in the wall was wired so that the normal hot was neutral
and vice versa. The circuit was run in thinwall electrical conduit
with no separate ground wire (the EMT was serving as ground) IIRC.
(It's been a while.)
The metal chassis of the computer should have been at ground. But it
was hot. The computer ran fine, all it cares about is 110 VAC.
The LAN cable was twin-ax, two connectors covered by a coaxial shield,
with nice big metal end connectors. So the shield and connector at
this PC was hot. The next PC on the network was at proper ground, so
its shield and connector were at ground. The two LAN cables were
hooked together in the middle with a double female barrel connector,
so when I connected them I had a hot metal connector in my left hand
and a grounded one in my right hand, and got that old familiar tingle.
Had they been power wires I would have tested with a meter first, but
who ever thinks of a network line carrying power?
If you're willing to shell out $30-40, you can get a module that lets
you make the fan remote controlled. Otherwise, you can get a cheap
replacement switch for $10 or so.
As usual, turn the power off at circuit breaker before attempting any
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