On 4 Oct 2016 at 13:18, Jim Brown wrote:
> > One last question: I assume that #10 bare wire is NOT large enough to bond
> > all ground
> > rods/systems together? What size would you suggest?
>
> A "bond," by definition, is "a mechanically robust, low impedance
> connection that is capable of carrying any fault current that may be
> occur." Worst case, that's lightning, so we'd like the conductor to be
> large enough to carry the discharge without melting. Obviously, that
> depends on how close the hit is, but larger is better. :) As to
> impedance -- remember that lightning is an RF event, NOT a DC event,
Yup. Obvious to those of us who think about it.
> so
> impedance is dominated by inductance. This dictates that "shorter is
> better." My bonds between earth electrodes are #4 stranded copper. In
> large buildings, AWG #00 or #0000 is often used.
OK. My rods are about 8 feet apart. I'll use #4 there. Then to connect THOSE
rods to the
main panel rods, is another 20 feet, so I'll use #00 there. And will use #4 to
take the first set
of rods to the shack, about 10 feet.
Thanks,
Ken W7EKB
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|