DAS ERCCS lightning protection. Aluminum bus bar in rooftop box

82angelfan

Member
Location
Hesperia, Ca
My ERCCS contractor is saying the small bus bar in my nema 3R can has to be copper.

I have a #4 copper from mast to 3R can, aluminum bus. Then a #4 from aluminum bus to copper bus in IDF room. Then #4 to ERCCS boxes. Will inspector ding me on the aluminum bus bar per NFPA 780?

I don't have that code book
 
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