Electrical Detective Story

["Robert Green" <ROBERT_GREEN1963@xxxxxxxxx>]

http://www.copper.org/applications/electrical/pq/casestudy/high_rise_office_
A6095.html

Not really HA, but explains a lot of the troubles our company experienced
when we moved into an older hi-rise office building.   I remember thinking
"is this guy trying to sell us a skyhook?" when a "sparkie" described how
the quivering images on some of our graphics workstations were caused by an
imbalanced loading on a three-phase system.


The article, "Copper Corrects Power Quality Problems in Columbus, Ohio,
High-Rise Office Tower" has an obvious pro-copper theme:
"Recurring Problems Vanish when Copper Replaces Aluminum Feeders."  The
authors were puzzled by an additional, out-of-conduit groundwire they found:

http://www.copper.org/applications/electrical/pq/casestudy/images/A6095_Fig4
.jpg

I'll bet I know why it's there.  It was one of the many attempted fixes
electricians made to try to correct the monitor problem we were having.

It's an interesting read, if you're into high voltage office building
wiring.  :-)

--
Bobby G.