On Wed, 2 Feb 2005 18:33:28 -0500, Tom Rauch wrote:
>I don't understand that.
I don't either. Some clarifications.
I am QUITE certain that any smart engineer would specify that the
ground conductor be bonded to ferrous conduit at each end. Why?
Because it it was not bonded, the conduit WOULD significantly
increase the inductance of the ground wire running through it. But
by bonding it at both ends, the bonding conductor consists of the
parallel combination of the copper wire inside it and the conduit
itself. At low frequencies, the copper may contribute significantly
to the conductance. As frequency increases, the current will flow
almost entirely in the conduit.
On the other hand, ferrous conduit that is buried would need some
sort of serious protective coating to prevent it from degrading over
time. Many folks recommend the use of PVC for conduit that will be
buried.
Jim Brown K9YC
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|