250.24(B)

[Mezani]

In a panelboard (service), if I install a ground bar to the enclosure for extra space that is needed for the equipment grounds, would I need a main bonding jumper from the neutral bar to the ground bar or would the bond screw be sufficient? What if I want to take grounded conductors to the added ground bar?

 

[infinity]

The enclosure cannot be used as a path for the neutral current so an EGC bar mounted to the enclosure cannot be used to terminate neutral conductors.

 

[GoldDigger]

Without the mounting being supplemented with a bonding wire, that is.

 

[jumper]

If you put only EGCs in the bus bar than the bond screw(s) are sufficient. If you wish to put grounded conductors in it than a properly sized wire jumper or other approved method for connecting the two busses will be needed. The enclosure cannot be used for neutral current.

Edit: typed too slow.