The requirements for outlets in general, and receptacle outlets in particular, are given in part III of Article 210, starting at 210.50. For non-dwelling units, the requirements are minimal. There is no requirement for a receptacle in an electrical room, in part because there is no requirement for the existence of an electrical room.
That said, I will always put one near the door. If the building has an optional standby system, the receptacle (and the lights) in the main and auxiliary electrical rooms will be connected to that source.
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