Neutral ground bar in main panel

I've installed a 100amp subpanel in my workshop. I'm using 2-2-2-4 trailer feed cable for my conductors. The Subpanel is being fed from a 60amp breaker in my main panel. It's an Eaton Cutler Hammer brand panel and uses 1 neutral ground bar for the neutral and grounds. The problem is that all the spaces on the bar are full. It has tapped mounting holes for an additional bar, so I went that route. I've mounted the bar directly to the can and I've mounted the appropriate sized lugs for the #2 wire. My question is, is it sufficient to have the bar mounted directly to the box, or is it necessary to bond it with a #6 copper wire to the original neutral ground bar.

 

The additional mounting spots are for ground bars. You can't use an add-on ground bar for neutrals. What you need to do is remove some of the grounds from the neutral bus and move them to the new ground bar. You can extend them if needed.

 

That should be easy enough. Thanks for the help. I didn't even see that there was another thread posted recently about the same thing.

 

Since this is a sub panel, you shouldn't have the grounds on the neutral bar anyway.

 

Sorry. I should have been more specific in my original post. The neutrals and grounds are separated and not bonded in the sub. It's the main panel that has no room on the neutral ground bar

 

You should still move some ground conductors from the neutral bar to a new added ground bar which is bonded to the panel box through both direct contact and the screw mounting. The neutral bus should already be bonded to the panel box.

 

Gotcha. Should I scuff some of the paint off in the box where the new ground bar makes contact?

 

Nope, the mounting screw(s) make a good enough bite.

 

I always do, just as belt-and-suspenders. With a wire wheel in the drill it takes a couple of seconds to do it.