I have not seen a generator come without an overcurrent device mounted on it that can serve as the disconnecting means.
Also 225.21 is not the section to look at, go to 445.18
445.18 Disconnecting Means Required for Generators.
Generators shall be equipped with a disconnect by means of which the generator and all protective devices and control apparatus are able to be disconnected entirely from the circuits supplied by the generator except where:
(1)The driving means for the generator can be readily shut down; and
(2)The generator is not arranged to operate in parallel with another generator or other source of voltage.
