The XFMR is part of the premises wiring system, so the disconnect is required. Seems like a roundabout way of doing it, but I can't the install, so I guess it must have been the cheapest way.
Those cell site plans always screw up on the service voltage. I don't think anyone checks with the POCO until after the plans have been bid and contract let.
They always want single phase, must be a Telco thing.
