I can't say about that, I don't know Chance designs personally and couldn't
comment even if I did... though if they are indeed having a much higher
failure rate than other similar designs it would sure seem like there was
either a design or manufacturing flaw somewhere.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
> -----Original Message-----
> From: rfi-bounces@contesting.com [mailto:rfi-bounces@contesting.com] On
> Behalf Of kd4e
> Sent: Thursday, September 15, 2005 02:25
> To: rfi@contesting.com
> Subject: Re: [RFI] A `Time Bomb' Sits Atop Utility Poles
>
> David Robbins wrote:
> > They do on insulators. Where I used to work we tested insulators in
> > accelerated aging environments, breakdown voltage, and mechanical
> stress.
> > Most insulators are supposed to have an expansion material, usually like
> a
> > heavy tar, between the metal pin and porcelain. In some cases the
> assembly
> > is defective and the metal is in direct contact with the porcelain which
> can
> > contribute to failures. In other cases an air gap between the pin and
> > filler allows corona and discharge internal to the insulator which is
> also
> > bad. Non-ceramic insulators have other types of problems and are easily
> > damaged by rough handling or incorrect installation.
>
>
> So it is just Chance who may have taken a short-cut in
> design and manufacturing and left out the expansion
> material?
>
>
> --
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Can we all just help the hurting and save the criticism?
> List of Organizations who are HELPING Katrina's Victims:
> http://www.bibleseven.com/em.html
>
> Thanks! & 73, doc kd4e
>
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