EE WAS SHOCKED BY AN ELECTRICAL CURRENT OF 277V OF A V CONFIGURATION OF A 480 VOLT TEMPORARY SERVICE LINE. EE AND 3 OTHER PERSONNEL WERE ATTEMPTING TO UNPLUG A CULVERT WITH A 72' RE-BAR SNAKE TOOL, WHEN THEY UNEXPECTEDLY & UNKNOWINGLY STRUCK ONE LEG OF THE 480 LINE THAT WAS LAID UNDER THE GROUND ACCROSS THE CULVERT.