I also wonder about this whole disconnect/feeder/structure question. If these are feeders then we need to drive a rod at every A/C condenser if it has an internal disconnect/breaker.
If the breaker being supplied is part of listed equipment then the circuit supplying it is a branch circuit. If the breaker is field installed the circuit supplying it is a feeder if there is more than one breaker in the field installed assembly. With only one breaker and no provision for additional breakers it could still be a branch circuit.
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Tom Horne