I know everyone will recite the NEC definition of service and SDS but I'm hoping for some different explanations. Imagine a industrial facility which owns the 12.47kV distribution loop around its site and the pad mount 12.47kV-P to 480/277V-S transformers. The secondary sides of each transformer feeds into MCC rooms. Previous engineers have called each of these transformers services but I refer to them as seperately derived systems. Are these considered services or seperately derived systems?