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Bonding/Grounding question for dust collection system ductwork

Question asked by Beau McLeod on Sep 6, 2016

I am designing a dust collection system and I need to ground/bond the metal ductwork that can carry a potential charge. I have read the pertinent sections of the NEC, NESC, and NFPA 70B, but I am not completely sure what size conductor to use for the bonding between the two flanges. The NESC states that for bonding between electrodes, a copper wire of no less than 6 AWG shall be used. Should I also use this standard for metal ductwork? What is the best way to actually attach the grounding/bonding conductor to the metal ductwork? The duct would be galvanized steel.  Any help would be greatly appreciated. Thank you!

 

References - NFPA 70 (Article 250), NFPA 70E, NFPA 70B, NESC (Section 9, 2006), and NFPA 664 8.2.2.3.1.8 (2017)

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