THE CONTRACTOR'S EE WAS PULLING ROPE & WIER NEXTTO A PORTABLE CONTROL PANEL THAT WAS BEING PLACED AT THE EDGE OF THE CONCRETE PAD. ONE SIDE OF THE PORTABLE'S STAND LEGS WERE NOT ON THE CONCRET E PAD & IT WAS NOT OBSERVED HOW THE ELECTRICAL PANEL FELL OVER, BUT IT DID KNOCKING THE CONTRACTOR EE TO THE GROUND