I have a question concerning an electrical blast we had at our plant. We have two MCCs rated with 1200A mains in a room. All three of the vertical busbars in two of the columns of one MCC appears to have arced to the bottom horizontal ground bar. A total of seven vertical bars blew about an inch of copper off the bottom portion of the bar. The main did not trip. The 30A on the primary side of tranformer did not blow but one 80A up the line blew. The cutout did not fall but the link pulled loose from the locknut. Can you give any insight which end this incident occured from? This is a pet food plant with some dust build-up.
Thank you,
Daniel Topping
