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PROTECTION AGAINST POWER LOSS

PROTECTION AGAINST POWER LOSS.
Ships with ship service, emergency, and casualty power distribution systems can be protected against power loss (according to the type of failure) as follows:

a. Failure of One Generator . A remote generator can be connected by bus ties to power the switchboard that normally receives power from the failed generator.

b. Circuit or Switchboard Failure . Vital loads can be transferred to an alternate or emergency source of power by means of a transfer switch near the user equipment.

c. Failure of Both Normal and Alternate Power Supplies . On some ships, when both normal and alternate
sources of ship power fail, vital auxiliaries connected to an emergency switchboard receive power from an
emergency or dual purpose generator. A dedicated emergency system is not provided on all ships.

d. Failure of Ship Service and Emergency Circuits . Temporary circuits can be rigged with the casualty power distribution system. They will supply power to vital auxiliaries if any ship service or emergency generator can be operated.
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