I'm in the process of installing a 175A feeder sub-panel off of a 200A Homeline load center in a 50'x100' steel bldg. I ran 4/0-4/0-4/0-2/0 AL SER cable on top of a steel girt (without conduit) in this steel bldg. I am going to splice this AL SER cable in a junction box (polaris connectors)...