Lightning protection [RE-wrenches]

[Drake Chamberlin]

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On an array in a lightning intensive area we have beefed up the grounding 
system and added extra surge protection.

Would it be a good idea to put a surge protector on the array itself.  The 
array is protected by an Outback ground fault protection system (OBDC 
GFP/2), so that the circuit could possibly open on a surge.  We would put 
the surge protector on the combiner box, which is a disconnect with 
cartridge fuses.

My concern is that the frame of the array will connect to the circuit 
conductors if the protector clamps.  As I understand the issue, the frame 
is the first part of the array to become energized.  If the system clamps 
due to high voltage on the frame, could it back feed static from the frame 
into the system?

Or could we figure the ground rods will dissipate the static before this 
becomes a problem?  Or since both circuit conductors and the frame will all 
be at the same potential if the surge arrestor clamps, would that alleviate 
the problem?

Thanks,

Drake   

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