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[TowerTalk] Testing guy terminations

To: <>
Subject: [TowerTalk] Testing guy terminations
From: (M.Gray Brafford)
Date: Wed, 9 Apr 1997 15:16:01 -0400

> From:
> To:;
> Subject: Re: [TowerTalk] Testing guy terminations
To: <>
> Date: Wednesday, April 09, 1997 10:39 AM
> In a message dated 97-04-08 21:34:48 EDT, you write:
> > How do we KNOW (proof test)
> >  the installed strength of our particular connections? 
I have the original preforms on my #1 tower, which are 24 years old. So far
no problems. Thats proof enough for me.


>       Interesting question.  I don't know of any professional company who
> does this so it seems to be out of the purview of amateurs.  All of the
> components that we use and install have been designed by engineers and
> exhaustively tested by the manufacturers to comply with industry
> (like the TIA-222).   You can bet that there is safe engineering overhead
> already added to the specification.  That's another reason that justifies
> PE stamp on your tower plans.
> > I don't use
> >  guy grips because the one and only time I tried using them, bought new
> >  from Texas Towers on guy cable bought new from Texas Towers, a grip
> >  APPEARED to be properly installed let loose while tensioning the guy
> >  with a comealong.  
>       Using the proper Preforms for a guy wire should be a slam dunk for
> and reliable installation.  The Preform design takes in account cable
> diameter, inside diameter, rod diameter, number of rods, pitch length,
> of pitch lengths, direction of lay and raw material.  These seemingly
> devices are actually pretty complex.  Preformed guy grips have largely
> replaced cable clamps as guy wire terminations in most industries because
> they're faster, easier and more consistent in their installation than
> clamps.
>       I guess my question to your above mentioned problem is what error
> made that lead to the problem?  An error was made somewhere.
> >  
> >  Does anyone out there test under load both ends of cables they use on
> >  their towers?  If so, to what load and how is the tension applied?  
> >  Obviously we can't test to destruction but how about loading to, say,
> >  5,000 pounds of tension on the 1/4" guy wire?  Most of us don't have
> >  comealongs that are safe with that kind of tension, and a failure of a
> >  guy at that tension would appear to be potentially fatal for the
> >  but how else do we KNOW that the installation will hold under the
> >  load?
> >  
>      See the above comments.  The field test that you are mentioning may
> the sole purpose of giving you more confidence in your hardware and
> installation abilities.  As for me, I will follow the manufacturer's
> specifications and try not to reinvent the wheel for industry accepted
> hardware and techniques.
> 73,  Steve   K7LXC
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