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Posted by Rich256 on December 28, 2006, 3:56 pm
stars1234 wrote:
Deleted some of the history.
>
> Unlike most modern electronics, this one has a non-polarized socket for
> the charger and the power cord is non-polarized, non-grounded too.
> Neither is there any kind of marking, such as a white stripe along the
> cord that lets me know which is the hot/neutral side. From what I've
> read, a white stripe usually indicates it is the polarized side (the
> neutral) and goes into the longer slot on the wall socket. The longer
> slot is always neutral. Is that right?
Correct. However, a polarized connection is not necessary for the
charger. It does not know the difference.
>
> The instructions say, plug the charger into the computer and then that
> into the wall socket.
> When I did it, there was an arc from the wall socket's left slot. I
> thought that's strange. (This is one of the three prong, polarized,
> grounded (but not really) sockets.)
Now that worries me.
>
> I left it plugged in for a day or so. I unplugged it. Later, when I
> plugged it back in, without paying attention to the orientation of the
> plug, there was no spark. I thought, "strange," again. So, I flipped
> the power cord plug over, plugged it in that way and sure enough, a
> spark from the left slot of the wall socket. --bright blue and snappy.
> Obviously, the left (tall) slot of the wall socket is hot (which I
> think is backwards according to code?). And with no white stripe on
> the power cord that plugs into the transformer, then no polarized
> socket on the computer: two round holes, instead of a square and round,
> I can't tell which is hot/neutral and what should go where, but I
> sure didn't like the arc at the wall socket.
Arcs should not happen under any condition. The presence of an arc has
no relationship as to which line is hot. That is unless you are
shorting a ground to the wires.
>
> Looking at the power cord's plug, the tip of the prong that got the
> zap, is a bit black and melted.
> Of course, I don't want to destroy the very expensive computer.
>
My thoughts are that there is something wrong with the socket. Perhaps
a loose wire.
> 1) Does it matter which way the power cord goes into the outlet?
> With nothing polarized, I don't know what to do. Or does it matter?
No. It should not make any difference.
> Spark, no spark? destroy my computer or is it okay, no matter which
> way it goes into the AC?
>
>
> 2) Further checking the wall sockets, looking at them from the front
> (ground down), I find some take a polarized plug's neutral prong, (I
> think that the wide one), fits into the wall socket's tall, left
> slot; for others wall sockets though, the tall slot is on the right. .
>
Orientation is not important. What is important is how the sockets were
wired. If your wire has the proper color code the hot should be black
and the neutral should be white. Black connected to the narrow slot and
white to the wide.
>
> I assume that the wall sockets that take it on the right are turned
> upside down, so no harm done-as long as it's wired correctly.
> (I'm off to Lowes to get an outlet checker.)
>
Correct. No problem
>
> 3) I tested a three prong, polarized, grounded (but not really), duplex
> socket with my VOM (battery powered) for voltage. I pushed one probe
> into the short slot, the other into the long (left) slot.
>
> When I put the probe into the left slot-Pow! A nice, blue arc from
> the tip of it into the slot.
Not a good test. You should not be drawing any current to speak of
through your meter. That is unless you have it on a current measurement
setting. Then I would expect you would blow something.
> I tried it again and the same thing happened. I switched the
> probes-no arc. I was surprised by that since I thought with AC, as
> long as the VOM is set to AC, it doesn't matter which way the +-
> probes go.
>
> Since the arcing distracted me, I failed to get the voltage. I tried
> my VOM once more.
>
> This time, when I put the probe into the left slot there was a big
> flash. My VOM went dead-is dead-- and so is the wall outlet. Now,
> I have to go by a new VOM, new wall socket. Funny that the fuse
> didn't blow in the VOM nor did a circuit breaker trip.
>
Again I have to guess that there was something wrong inside the VOM.
You blew the line open before the circuit breaker had time to trip.
> Ideas on what may have happened and how do I fix it?
>
> Most importantly though, any damage being done to the computer?
I would hold off until I find out what the voltages are doing.
I think you must have had a short inside the VOM all along.
To verify which line is hot and which is neutral I would us a jumper to
get the negative lead of my vom hooked to a ground such as a water pipe.
Then you should read 110 on the hot line. If you are using a high
impedance meter you might see some voltage on the neutral but not very high.
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