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Illustrated Changes to the NEC, 2005 Edition - Part 2

Article 445

Generators

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
(1) The driving means for the generator can be readily shut down, and
(2) The generator isnít arranged to operate in parallel with another generator or other source of voltage.
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)].


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