Underground power lines pose the same hazards as overhead lines. Illinois requires the person doing the digging to call JULIE at 811 at least 2 business days before the start of any excavating, boring, pile driving, blasting or hand digging, so that underground utility lines can be located and marked.
Once marked, use appropriate equipment to maintain the required clearance from the power lines. Place barricades and warning devices around excavations with exposed cables or pipes. Don’t try to repair damaged cables or lines.