K7LXC@aol.com wrote:
>
> In a message dated 2/25/2008 7:40:10 P.M. Pacific Standard Time,
> K8RI-on-TowerTalk@tm.net writes:
>
>
>> Take a length of the copper pipe (say 6" long) or tube with an ID about
>>
> the same or *slightly* larger than the diameter of the coax with the
> jacket removed. Split the copper tube or pipe lengthwise (IOW saw it
> into two mating pieces). Solder/Braze the ground wire *lengthwise*
> onto the outside of one half. Clamp it to the braid by wrapping the
> sections with the rubber vapor wrap and tape which also water/moisture
> proofs the connection.
>
>
> Soldered/brazed joints are not appropriate for lightning systems.
> The only NEC approved grounding connections are compression or exothermic
> (e.g.
> CadWeld).
>
I agree with the solder part, but today's brazing is so close to the
melting point of copper it should be as good as welding which to me says
the NEC is a bit out of date. BTW TIG welding works very well with
copper and aluminum. Also with this type of connection even a solder
joint over a wide area will give a better and more durable connection
than a clamp type.
Exothermic is used and accepted because it works so well (easy to use
and repeatable results with little skill required) in welding copper
cable to steel ground rods. Copper to copper is a whole different world.
73
Roger (K8RI)
>
> Cheers,
> Steve K7LXC
> TOWER TECH
>
>
>
> **************Ideas to please picky eaters. Watch video on AOL Living.
> (http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duffy/
> 2050827?NCID=aolcmp00300000002598)
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|