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maritime DC & PPE Information Center


Casualty Power System
The Casualty Power System makes temporary power connections to limited equipment if the permanently installed ship’s service and emergency distribution cables are damaged.
Casualty Power cabling is laid out by repair party personnel however the ship’s electricians rigs the connections to ensure safe operations prior to energizing. The Damage Control Assistant ensures that the system is ready to be energized and directs that such action be taken after permission is obtained from the Commanding officer.
Important features of the basic design of the Casualty Power System include the following:
1. Preservation of watertight integrity of the ship
2. Simplicity of installation and operation
3. Flexibility of application
4. Interchangeability of parts and equipment
5. Minimum weight and space requirements
6. Ability to accomplish desired functions
Component parts of the casualty power distribution system include permanent and portable cables, risers, bulkhead and switchboard terminals, and portable switches. Suitable lengths of portable cables are stowed throughout the ship close to the locations where they are needed. Each terminal provides a connection point for three-phase portable cables.
Risers, consisting of a terminal at each end connected by permanently installed cable, provide connection points for three-phase portable cables between decks. Suitable terminals are provided at switchboards and some distribution panels for connecting portable cables at these points, to obtain power from, or supply power to the bus bars. Locations of the portable cables, bulkhead terminals, and risers are chosen such that connections can be made to many vital electrical auxiliaries. Portable cable ends and terminals are marked to identify the three phases visually, or by touch when illumination is insufficient for visual identification.
Vertical risers are provided from the deck containing the horizontal portable cable run to the
switchboard compartments and to compartments that have power loads that receive casualty power on other deck levels. Portable cables provide a horizontal run of portable cable along the main deck. Portable cables are dispersed and stored throughout the damage control area on cable racks thus reducing the possibility of damage to the cable. Because of its portability, damage to cable on one or more racks will not seriously alter the effectiveness of the system, since cable from other racks can be employed as replacement cable.
Bulkhead terminals are provided for making horizontal or longitudinal cable runs, to permit a circuit to be carried through a bulkhead without repairing watertight integrity. Three phase portable cables can be connected to either end of the bulkhead terminal.
All bulkhead and riser terminals are kept covered at all times, except when in use.
Terminals not provided with covers must be fitted with removable covers so terminals are kept free from dust, paint, and other contaminating substances.

For more information, see the