[AFMUG] More Grounding stuff

[Adam Moffett]

I'm at a site where two towers are about 250' apart.  There's a 2" 
conduit between the two towers, with nothing in it but a fiber optic 
cable.  My tower does not have a generator, but the other one does. The 
guy at the other tower offered to let me run electric off of a breaker 
on his transfer panel so I could have a generator protected circuit.  
This sounds great in theory, but I have a bad feeling about it because 
(obviously) we have two separate electric services now and two separate 
grounding systems.

If I don't bond the grounds together it seems like different potentials 
at each site could equalize by passing energy through the ground/neutral 
wire of this theoretical power line, and it would get there via my 
equipment and blow something up in the process.

....but on the other hand, is bonding the grounds together something 
that's actually ok to do?