What was found
MOUNTING BASE OF AMMETER SHUNT BROKE UP AROUND THE 2 MOUNTING SCREWS ALLOWING THE SHUNT TO MOVE ABOUT. THE BASE OF THE MOUNT IS HOLLOW EXPOSING THE SCREWS THAT HOLD THE TERMINAL BLOCKS TO THE BASE. THESE SCREWS CONTACTED THE BASE MOUNTING SCREWS ARCING TO GROUND. THE REPLACEMENT SHUNT HAS A SOLID BASE MAKING IT STRONGER. THERE ARE NO EXPOSED SCREWS ON THE BOTTOM OF THE BASE OF THE NEW UNIT. BOTH SHUNTS HAVE THE SAME PART NUMBER.