Silly ground buss connection question
I'm putting in a 100A subpanel. The subpanel ground buss lug where the ground to the main panel is intended to be connected is rated for #4 or larger. #8 is all that is required for a 100A subpanel feed. #8 will fit into the other holes on the ground bar. Can I connect it to one of the smaller holes or do I need to use some kind of adpater to connect it to the intended lug?
I realize electrically it makes no difference, I just want to do it the right way. The panel is a Siemens G1624L1125CP if it makes a difference.