Recently, we noticed 2 bolts of our 12kV Ring Main Unit switchgear enclosure were totally burned that left 2 empty burned holes. Also, we found that the earthing/grounding connection of the switchgear and the 3 core power cable armor was missing. Additionally, a fault occured along the line which this RMU was connected. To make matters interesting a fire occurred on the accumulated combustible garbage around the equipment. My question is - Was the fire could have been possibly caused by the burnt/melted bolts that fell on the garbage near the RMU? Was the fault the cause of the burned bolts?
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