you know I was in my distributors warehouse today and i noticed more than a few transformers that had been returned of a certian brand with melted terminal blocks. I asked what was up and was told contractor error probably didn't tighten the terminals properly . Now this is of course possible but to have that many of them like that from different customers indicates to me a possible manufacturer problem. any of use ever had a problem like this. Talk about potential hazard. Made me want to put my tool belt on e-bay and call it a career.