OK. I agree that if the building was in fact fed by 2 or more SERVICES the signs would be a requirement. I am using the definition of "service" from article 100 "The conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premesis served"
By that definition, I would not classify a SUBFED PANEL as a service but as premisis wiring, thus no requirement for signage, but still a good idea.
As far as a single disconnecting means, if you throw off the main breaker or disconnect at the SERVICE ENTRANCE, you will still disconnect the entire premisis wiring system.
The fact that two supposedly educated and trained individuals (You and I) can have a difference of interpretation is exactly why 90.4 states that the AHJ has the responsibility for making interpretations of the rules.
I am not saying my suggestion is perfect, take it at what it is, a suggested solution to a problem, posed by a faceless individual on a discussion forum.
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