Sizing bonding jumper ground bar

[Cletis]

When your adding say a 10 port ground/neutral bar in main panel for extra space how do you size bonding jumper?

I usually just run a #6 cu from new bar to existing for added protection. I dont trust to
2 mounting screws really


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[Smart $]

See 250.102(D)... That'll send you to 250.122.

 

[don_resqcapt19]

If it is an identified factor accessory for the panel, no bonding jumper is required, so there is no size requirement for any bonding jumper that you may install. If you really want to install one, I would base it on the size of the highest rated breaker that can be installed in the panel.