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Friday, December 8, 2017
Question:
When running my electric from breaker box to ac disconnect box ran in sq 80 then 3 foot flex. I run 3 wire one ground 2 hot. Do I have to bond them? If so what is the easy way
Steve Ambro
A
Answer:
Hey Steve thanks for your question. It is not clear what "sq 80" is and you don't provide the voltage or overcurrent protection device rating. If metal raceways or metal sheathed cables are connected to an enclosure with oversized, concentric or eccentric knockouts and the voltage is above 250 volts to ground, bonding must be provided as stated in 250.97. Also make sure you comply with 250.118(5) if you are using flexible metal conduit. The easy way depends on the voltage, overcurrent protection device rating, and other specific details but bonding locknuts, bonding bushings, or bonding wedges could be a possible solution.