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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?

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Install a ground lug in the panel, something like this one, or use a kit like this one. Just remember, like you said, that the neutral bar has to be isolated from the panel. It'll be on plastic/insulating stand-offs.

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    This will make the job much easier, but know that most modern ground and neutral bars will accept up to a #4 conductor. It just needs to be cut cleanly and the end not buggered up. – Speedy Petey Jan 17 '16 at 18:05
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    @SpeedyPetey I presumed the OP had already tried and failed to stuff a #4 into that grounding bus. ;-) Upvoted your comment, though. – Craig Jan 17 '16 at 20:10

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