at each emergency switchboard. They consist of
casualty power terminals that are connected to the
bus bars through circuit breakers. Some ships
have small diesel-driven generators which are
designed for casualty power use only; these
generators are very small and have a minimum
of control equipment. Casualty power terminals
are installed on power panels that feed equipment
designated to receive casualty power; these ter-
minals may also be used as a source of supply to
the casualty power system if power from the per-
manent feeders to the panels is still available.
The casualty power system is either a.c. or
d.c., as appropriate for the particular installation.
Only the a.c. system is described here. The d.c.
system is similar to the a.c. system, but uses dif-
ferent types of cables and fittings.
The portable, thermoplastic-covered or
neoprene-covered cables for the a.c. casualty
power system are stowed in racks in convenient
locations throughout the ship. Each cable contains
three leads (conductors), colored black, white, and
red. This same color code is used in all three-wire
power circuits throughout the ship.
On smaller ships, the bulkhead terminals for
the casualty power system are arranged so as to
allow for one horizontal run of the portable cable
along the main deck, and generally, if possible,
inside the deck house. On larger ships, generally
there are terminals for two horizontal runs of
cable, one port and one starboard. These are
located on the second deck. The terminals extend
through the bulkhead and project from it on each
side, and do not impair the water-tight integrity
of the compartments in which they are installed.
The cable ends are inserted into the holes that are
provided around the outer rim (curved surface)
of the terminal. Both the rim and the face of each
terminal have three groups of three holes each,
into which fit the square-shanked, insulated
wrenches that are used to secure the cables in the
terminal. Two square-shanked wrenches are pro-
vided in the rack mounted on the bulkhead at each
point where they will be required. These wrenches
MUST be kept in the racks at all times when they
are not actually in use.
The riser terminals for the casualty power
system are similar to the bulkhead terminals, ex-
cept that they are connected to other riser ter-
minals by vertical runs of permanently installed,
armored cable. The risers and the riser terminals
carry the casualty power from the level of the
generators to the main deck and second deck
Portable switches are sometimes provided on
the bulkheads, near the cable racks. These are sim-
ple ON-OFF switches which have special holes for
use with the portable cables.
The terminals and the cables in an a.c. casualty
power system are marked so that they can be iden-
tified easily when the system is being connected.
The faces of the terminals are marked A, B, and
C, and the three leads on each cable are colored
black, white, and red, respectively. When connect-
ing the cables to the terminals, you connect the
black lead to A, the white lead to B, and the red
lead to C. Since the letters and the colors cannot
be seen in darkness, the terminals are further iden-
tified by molded knobs in the A, B, and C
areasone knob for A, two for B, and three for
C. The cable leads are identified by servings of
twineone for black, two for white, and three
for red. Each serving of twine is about 1 inch
wide. Thus each lead and its corresponding posi-
tion in the terminal can be identified merely by
feeling the leads and matching the number of
pieces of twine on each lead with the number of
raised knobs on the terminal. (In older ships, the
casualty power fittings may still have identifying
V-shaped notches in the outer edge instead of
CAUTION: When connecting a run of casu-
alty power cable, ALWAYS CONNECT FROM
THE LOAD BACK TO THE POWER SUPPLY!
By rigging the system in this manner, you will
avoid working with an energized cable. Also be
SURE to shut off the normal supply to any power
panel before you connect the casualty power cable
to the terminals on the power panel.
EMERGENCY FIRE PUMPS
Most ships have electric-driven fire pumps
located outside the engineering spaces. These
pumps furnish water under presssure to their own
piping system or to the ships firemain. Provisions
are made for different sources of electrical power
to these pumps: normal and alternate supply from
the ships service generators, emergency supply
from the diesel-driven emergency generators, and
the casualty power system itself.
ENGINEMAN 1 & C