[amsat-bb] Re: Lightning protection

K5OE k5oe at aol.com
Wed Oct 16 23:44:36 PDT 2013

K9STH wrote:
> Sorry, but NFPA NEC (National Electrical Code) definitely requires that ALL 
> grounding electrodes MUST be connected together!  There are VERY good reasons 
> for doing this...

Yeah, this is a requirement that has vexed designers of complex electrical systems for years.
One solution, generally meeting this requirement, is to go ahead an utilize separate ground rods
and tie the rods together with a (large) grounding cable--usually pvc insulated cable for corrosion 
protection. In industrial installations these connections are often made so they can be 
disconnected in the event of differential currents flowing and causing problems with 
communication/signal systems.

Much like K8BL's recommendations, I too have used #10 AWG for the ground from the rotor/mast
 to the ground rod, and hoped and prayed the lightning liked it (if ever needed).  This is especially important
for a non-earthed installation like a tripod on a roof.  I have been fortunate to never having to find out...

Jerry, M0GOE

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