Grounding/Bonding metal equipment

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winslowfam

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VA
Hi...we have a client installing a dust collector and fan. 250.112 indicates to me that these pieces of equipment need to be grounded/bonded to the building grounding system, and it seems that the wire size needs to based on 250.66. The motor wiring is #2/0 AWG so does that mean the grounding/bonding jumper needs to be #4 AWG CU? I'm unsure exactly how this work.
 
You would use Table 250.122 to size the EGC.

Roger
 
250.66 is for grounding electrode conductors. In you situation it is not applicable. The electrical components require grounding (250 Part VI) and that would be accomplished by an equipment grounding conductor as described in 250.118. If the grounding of electrical equipment is accomplished by a separate conductor then 250.122 comes into play.
The duct system itself is covered by 250.104(3)(B). If the electrical equipment and the duct are connected then the grounding conductor for the equip met is considered adequate for the duct. If the duct is isolated, then 250.104 would require a bonding jumper size per 250.122.
 
The motor has an EGC sized by 250.122...so to bond/ground the steel of the dust collector and fan to the ground ring or building steel, I would use the same table? I appreciate the help.
 
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