I need to install a sub-panel in my home. Both the main panel and the sub panel are in the same building. I purchased a Square D Homeline Indoor Plug-On Neutral panel (Model # HOM2040M100PCVP) for this. I plan on using aluminum 2-2-2-4 cable to feed this 100Amp sub-panel from the main panel. When I got the new sub-panel home, I discovered that the panel is designed to place the neutral and ground on the same bus bar. Since this is a sub-panel, I understand that I need to isolate the ground from the neutral. I've purchased two Square D ground bars (Model # PK23GTACP) for this. The question is, how do I attach the #4 service ground cable to the sub-panel? Is there some kind of special clamp to attach the service ground cable to the panel body?