Line 3 goes down far too often, and the cause is nearly always “fried electronics.”
The plant manager has personally taken control of this issue, due to the loss of revenue from lost production. But he tells you he’s confused. First, the solution was a bigger Surge Protection Device (SPD) on the branch circuit panel. That didn’t solve the problem. Now the recommended solution is a smaller SPD.
He wants you to sort this out. Where do you st