445.18 Disconnecting Means
Change permits a single generator to have multiple disconnecting means to allow flexibility and to provide a safer environment when maintenance is necessary. This rule is necessary because a single generator can be used to supply emergency, legally required, as well as optional standby power through different transfer switches.
Generators must have one or more disconnecting means that disconnects all power, except where: Figure 445-1
Caution: If one generator is used to supply emergency, legally required, as well as optional standby power, then there must be at least two transfer switches. One for emergency power and another for legally required as well as optional stand-by power [700.6(D)].
(1) The driving means for the generator can be readily shut down, and
(2) The generator isn’t arranged to operate in parallel with another generator or other source of voltage.
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