Socket Head Cap Screw as a Bonding Fastener

[markmedici]

Is a socket head cap screw (SHCS) acceptable as a bonding fastener on machinery?

SHCS are coated with black oxide which is an insulator.

Installing a bonding connection to remote machine parts involves using the correct conductor and terminal. If the bonding surface is painted, the paint must be removed for a good connection. But NEC 250.8 describes specific connection methods including machine screws with 2 threads minimum, which implies electrical conductivity through the fastener.

So can I use an insulated fastener to fasten an approved ground/bond conductor and terminal to a bare metal machine part or anywhere for that matter?

Thanks

 

[Smart $]

Is a socket head cap screw (SHCS) acceptable as a bonding fastener on machinery?

SHCS are coated with black oxide which is an insulator.

Installing a bonding connection to remote machine parts involves using the correct conductor and terminal. If the bonding surface is painted, the paint must be removed for a good connection. But NEC 250.8 describes specific connection methods including machine screws with 2 threads minimum, which implies electrical conductivity through the fastener.

So can I use an insulated fastener to fasten an approved ground/bond conductor and terminal to a bare metal machine part or anywhere for that matter?

Thanks

IMO, the NEC does not provide the technical data to make SHCS's a violation. Where you may get some relief is 110.3(B) "instructions" from the terminal manufacturer.