My solar install folks are having an issue showing me what I am using. They had to order a Tesla 400 amp CT on the commercial side to fit my 400 amp service. But the issue they are having is my feed from the pole/grid is on a 500 mcm cable and the Tesla 400 amp CT won't fit. Has anyone else had this issue and found a solution. Forgive me I am not an electrician, just relaying what I am being told.