Yes, I am familiar with the issue that the POCO guy was describing. It can be difficult to open the primary cut-outs on some of the newer transformers to clear a line-to-case fault. This is because the cut-outs are designed to be very tight to prevent arcing and other problems. However, this can make it difficult to open the cut-outs quickly in an emergency situation.There are a few things that can be done to address this issue. One is to use a special tool that is designed to open the cut-outs. Another is to use a higher voltage to open the cut-outs. However, this can be dangerous and should only be done by a qualified electrician.The best way to avoid this issue is to make sure that the transformer is properly maintained. This includes regularly inspecting the cut-outs and making sure that they are in good working order. It also includes keeping the transformer clean and free of debris.If you are experiencing this issue, it is important to contact a qualified electrician to have the transformer inspected and repaired. Flag for review