The previous poster was not talking about installing a fan, but replacing
the speed switch. Yes there is only one wire to supply power from the house
to the fan. But in many fans, there is a speed switch that has one wire that
bring electricity in and three that go out. They go to three different
windings (coils) in the fan motor itself.
If you are checking VOLTAGE, the number of AMPS running through your meter
is close to zero. Yes, I have blown the fuse in my meter once, but it was
because I got frustrated and accidently went to check a live circuit with
the meter set on resistance (OHMS). It stupidity, not price of the meter,
that was at fault.
It makes perfect sense. He is talking about the house receptacle the
computer was plugged into. AC current works by one side doing a push/pull
cycle of electrons while the other side is grounded. As long a electricty is
flowing first one way and then the other at the proper rate, it usually
doesnt matter which side is the live one. I knew (not well) a guy who wired
in some lights for some illegal plants he was growing ih the basement. He
bypassed the electric company's meter (and in the process the breaker panel)
to save money. He later went to change a burnt out bulb while standing on a
damp cement floor in bare feet. If he hadn't switched the wires, he would be
alive today. He had the screw threads of the bulb socket live instead of the
little dot in the middle.
okay, in that case, it make sense. So between the supply and three output
wires to the fan motor, is the device called a rheostat or not? And if not
what is it called?
Yet another reason to keep things simple.
okay that makes a little more sense. I was thinking he was refering to an
outlet on the computer and the times I considered rewiring an ATX plug for
a non-standard MB. I still don't see how having a live LAN cable can give
you shock unless it was coax instead of twisted pair.
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?
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