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There's lots of stuff I the forum about this, including important hazards to be ware of, but I will immediately caution you that the third prong on a power plug is for sAfety, it is not a magic hum killer. This equipment had neither a grounded plug nor a hum problem when new.
If you have a signal ground loop due to a poor chop, a safety ground will not fix it. If you screwed up the wire shielding or generator grounding, it won't fix that either. If you placed signal wires in the magnetic flux of a transformer, that too will not get fixed with a safety ground. I actually have that last problem in my l111 chop.