Date: Mon, 20 Jul 2015 02:32:54 -0500
From: "W5GN" <w5gn@mxg.com>
To: "'Jim Thomson'" <jim.thom@telus.net>, <towertalk@contesting.com>
Subject: Re: [TowerTalk] guy posts math
My dad ran Bartlett Tree who serviced all of the AEP lines in
SW Virginia and their engineer said they put 7 feet of a 35 foot
pole in the ground in the late 50s. Sounds like your TELCO poles
had lighter loads and thus put less in the ground than power poles.
73
Barry, W5GN
## IF only telco + cable are on the pole, the poles are usually shorter..like
35 feet.
IF it’s a joint use pole..and also has commercial AC power with the usual 12.5
kv or
14.4 kv HV on top, with lower voltage 240/120 down below plus telco and cable
etc,
then the poles are typ 40 ft tall. The HV sits another 18 inches above the 40
ft pole...
via an insulator on top of steel. What diam are ur poles ? What kind of
wood ?
Joint use pole applications typ makes up 95% of pole applications. You
rarely see
telco + cable co only poles, but they do exist.
## They all have a metal plate on em..exactly 12 foot up from the bottom. The
plate
if u know how to read it, will have info on it which also gives the exact
co-ordinates
of the pole location. When u see that the plate is 6 ft above the grnd, u
know the
pole is exactly 6 ft into the ground. If the plate was 5 ft above grnd, the
pole is 7 ft
into the grnd. This is the case for a 40 ft pole.
## Those 50 kva /75 /kva /100 kva /125 kva xfmrs weigh one helluva lot....and
if u have
ever seen em on the grnd, they are a lot bigger than u think. The most I have
seen on one pole
is 3 x 100 kva xfmrs. The place u see guy wires, typ at two levels is
where stuff Ts off to one side,
placing a huge side load on the pole. or where a pole line does a right
angle. Typ guy strand is either
.3125 or .375 inch for the bottom level.....and either .375 or .4375 for
the top level.
## If u ever see a new pole or poles laying on the ground in residential
neighbourhoods etc, get out
and measure the distance between the plate and the bottom end. Then compare
that to the total
end to end length of the pole. 30 ft poles will have the plate 10 ft from
the end. 40 ft poles will
have the plate 12 ft from the end etc.
## concrete pole have gone out of vogue. They had a lot of re-bars in them,
running the length of the
pole. I don’t know how deep they put concrete poles into the grnd. Only saw em
used for joint use
applications.
Jim VE7RF
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