I have an overhead service feeding a 200a main panel outside and am installing (via feed through lugs) a panel directly behind the wall inside. I was not going to bond the sub panel but am still curious that if it is technically a continuance of the outside "main" panel due to it being fed through.. wouldn't it still be considered part of the main service and require to be bonded? Or a sub panel that should not have a bond. What are your thoughts? I believe this is how mobile homes are set up so maybe someone with more experience in that field could help out.