PV array has been installed on the roof of a barn that is connected to the main residence by a series of additions. I was surprised to find that the barn has its own overhead service. The PV installer ran the interconnecting feeders through the barn roof to the exterior wall, then along the exterior of the additions to the main residence, where he installed the PV disconnect and tied into the house overhead service on the line side of the service disconnect. The barn service did not appear on the PV permit submittals. Would this be allowed with adequate directory signage?