Well said-seems like some of us suggested this 20 messages ago. Sometimes
you just don't know--An example: Three days ago some of my subcontractors
were working in a historic home we are restoring. After the old ceiling came
down, two wires from old knob and tube stuck out-They were ready to rip them
out!! I related a story to them of someone I knew in an identical situation
who was killed. I instructed them to stay clear until they were checked. The
house with the fatality had been rewired to codes BUT somehow someone left
one run of the old knob wiring hooked up.--Well-the next day my guys were
almost on their knees with a combination of thanks and disbelief--these
wires also were HOT-same scenario as the fatal one-they would have been hurt
or killed--when in doubt about anything electrical-check it out-it could
save your life. You can have your triplex, personally I will move it or bury
it. I did move it at my last QTH so I speak from experience. Tommy WD4K
-----Original Message-----
From: owner-towertalk@contesting.com
[mailto:owner-towertalk@contesting.com]On Behalf Of Chuck Kraly
Sent: Sunday, May 27, 2001 2:33 PM
To: rb; towertalk@contesting.com
Subject: Re: [TowerTalk] thoughts aboutproperty layout
OK, I've watched this thread long enuf.
1st my qualifications: 21yrs. with the Board of Public Utilities in Kansas
City, Kansas.
One rule to remember: ALL LINES CAN BE DEADLY!!!
Now, lets assume the triplex (or concentric neutral line, or open wire
service, whichever it maybe be), is fed from a 37.5 KVA transformer. A
single 120 leg of the feed is capable of 312.5 AMPS and NOT exceed the
capabilities of the xfrmr. That is NORMAL FULL LOAD. Not a short or low
impedance route to ground or thru you. Then it is ALMOST unlimited in
amperage. This is totally dependent to length of time of the short. Now as
for the durability of the insulation on triplex or any other wire, let me
related this story. A few years ago, we had a wind storm roll thru KCK. As
we were clearing lines and repairing them to restore power, we ran across a
tree limb that fell across the service drop, which WAS 4/0 triplex, and
VISUALLY in good shape. This limb pulled the triplex onto a 3/4 catv feeder
line for the neighborhood. Looking at the situation, if we got the limb off,
that would clear up the problem, and we could go on. Taking our fiberglass
hot stick, we moved the branch just an inch, and POOF, there was a bare spot
(just 1/4 inch in diameter) on the triplex, which burned the triplex AND the
CATV line in 2. Now assuming that it looked good, would I drop a BARE wire
across this?? Not in this lifetime. Think about gentlemen, would you want to
take that chance?? Also the current rating for the 120 leg was taken from
Howard Industries "Distribution Transformer Connections" Booklet. I have
worked with busses from 120 all the way to 161KV in the last 21 yrs. Thing
happen TOO fast to take chances. BURY THE DROP!!!
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