3. The EM at the switchboard opens the casualty
Upon determining that all power is lost, the EM
power circuit breaker, unrigs both ends of the first
opens all supply switches to the equipment and reports
portable cable, and reports "casualty power
to DCC that power is lost to the equipment.
de-energized" to main engine control. Main engine
Upon receiving report of all power lost, DCC
control reports compliance to damage control central.
requests main engine control to designate a source of
4. Upon receiving the de-energized report, DCC
casualty power for the equipment concerned. The
orders casualty power disconnected at the equipment.
request for a casualty power source maybe made to the
electrical officer on ships having a combined main
5. The repair party's EM disconnects both ends of
engine control and DCC or where the electrical officer
the last portable cable in the system at the load and
is stationed in DCC for the control of generators and
reports, when completed, to DCC.
6. DCC requests main engine control to energize
Main engine control or the electrical officer, as
normal circuits to the equipment and orders repair
parties concerned to unrig and restow the remainder of
appropriate, informs damage control central of the
the portable cables.
casualty power source to be used (giving riser terminal
number) and, at the same time, informs the EM on the
7. Main engine control directs the designated
appropriate switchboard that his or her board has been
switchboard to energize all normal circuits to the
designated as a source of casualty power to the riser
equipment and to report compliance. Main engine
terminal by number.
control reports compliance to DCC. The exercise is not
Upon receiving this information, DCC orders the
considered completed until DCC receives the report that
the equipment is operating on normal power and that all
repair parties concerned to rig casualty power from the
portable cables are restowed on their proper racks.
equipment to the designated source.
Speed is desirable in all casualty power operation;
Repair parties rig casualty power and report each
however, safety precautions must never be sacrificed to
section completed to DCC.
attain speed. A thorough knowledge of the casualty
After all sections have reported the rigging
power system and frequent drills by all personnel
completed, damage control central requests the main
involved are necessary for safe and expeditious results.
engine control electrical officer to "energize casualty
Upon receiving the request to energize, main
The number and locations of shore power
engine control or the electrical officer directs the
connections vary on different types of ships. Shore
designated switchboard to "connect and energize
power connections are provided at, or near, a suitable
casualty power," and to report compliance.
weather-deck location to which portable cables from the
The EM on the designated switchboard rigs the
shore or from ships alongside can be connected to
first cable from the source of the system, closes the
supply power for the ship's distribution system when the
casualty power circuit breaker, reports casualty power
ship's service generators are not in operation. This
energized to main engine control, and then reports
connection also can be used to supply power from the
compliance to DCC.
ship's service generators to ships alongside.
Shore-power arrangements and hardware used on
UNRIGGING CASUALTY POWER
both ship and shore installations are so diversified that
no specific installation instructions can be outlined in
Unrigging casualty power can be hazardous if not
detail. Ashore installation that has one circuit breaker
handled correctly. The steps to be taken to unrig
supplying a number of cable sets presents a particular
casualty power lines are as follows:
hazard. In this case, you can verify phase rotation and
phase orientation only by energizing all shore terminals.
1. DCC requests main engine control to
You should check phase rotation with only one set of
de-energize the casualty power system.
cables installed. The latest designs have a single,
three-phase receptacle for ship and shore-power
2. Main engine control directs the designated
terminals. These receptacles are keyed in such a manner
switchboard to de-energize and disconnect casualty
that phase rotation and orientation cannot be altered,
power and to report compliance.