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Discussion Starter · #1 · (Edited)
I am looking at some plans for an aircraft hangar job. They are calling for a static discharge grounding grid, and reference NFPA 409 in the specs.

Each hangar bay will have (2) floor mounted receptacles ERICO B165 where one can "plug in" a cable and attach it to the fuselage of the aircraft to prevent static charges from building. These grounding ports will be interconnected with bare copper wire cad-welded together into a grid, and finally terminated to several 3/4 x 10 ground rods.

They don't tell my what size wire to use -- only to check NFPA 409. Is there something in there that I need to know that is not part of the NEC?
 

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Discussion Starter · #4 · (Edited)
Copy that on the 15 ground rods. Exactly the number in this spec.

As for the #4 wire, I noticed the words "Counterpoise wire" -- something that is used for radio tower grounding grids??
 
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