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Re: [TowerTalk] Conduit for cables to the tower?

Subject: Re: [TowerTalk] Conduit for cables to the tower?
From: Nick Pair <>
Date: Thu, 14 Sep 2006 22:25:58 -0700 (PDT)
List-post: <>
Hello Dick,
  Also in the Polyphaser's doc's quoted in earlier posts they recommend GRC 
grounded at both ends. This seems to me the same idea to equalize voltages in 
the system. The GRC also is a choke to current surges and would limit the surge 
as you quoted to a shorter distance than without GRC. This is current limiting 
and not voltage limiting.
  I see no problem with the use of the hardline outer conductor for this 
purpose providing you use low impedance straight line connections at each end. 
NEC allows the outer to be a conductor as long as it is grounded at each end. 
This exceeds the GRC requirement of Polyphaser with the joint-less runs. 
Without the proper joint compounds in a GRC run you have lost conductivity in 
just a few years.
  You still need the ground wire in the 120/240 AC run to satisfy NEC. The GFCI 
protection is also a NEC requirement and is a place not to be cheep as others 
have cautioned. Be sure ground wire is grounded at both ends. Yes I know this a 
ground loop but I haven't been able to convince any inspectors in 2 states that 
I can dispense with the second connection and comply with the 2005 NEC. Out 
here we have state and city codes also, which makes you have to consult 3 code 
books on some installations and different requirements just yards apart.
  We used to have a inspector that was a ham and that made things a lot 
easier.Also way back in the early 70's it helped to know what the inspectors 
favorite beverage was. Alas those days are gone!
  Good luck Dick,

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