I just put in a new sub panel and there is not enough holes in the ground bus bar to accommodate all the the bare ground wires. Can I put more than one wire in each hole? Thanks
The following may depend on your local codes:
One per hole unless otherwised specified in the box.
You could add a second bus bar to the panel.
OEM specific if possible.
You could also connect the grounds and neutrals to either bus bar, since they are the same potential
unless this is a sub-panel (which, in this case, is not allowed).