Just curious, why assume it comes without a ground cable? I looked on the PP50 spec page and while the ground cable is not in the list of included equipment, there is a picture of a ground cable below. I doubt Everlast would sell a machine with less than the standard configuration of parts, just as GM wouldn't sell a car with no tires. The photo shows a dinse connector on the ground clamp- similarly they'd include a cable diameter with enough scrote to do the job well. Are you thinking you'll need a ground cable with greater capacity?