8A1. Description. Interior communication
(I.C.) systems in a submarine provide the means
of maintaining contact, transmitting orders, and
relaying indications of the condition of certain
machinery or other parts of the ship, to and
between various stations in the ship. Each of the
systems is designed to perform a specific function
such as transmission of voice, transmission
of an indication of heat or pressure, the degree
of rotation of some device, the open or closed
state of a valve, or simple bell or light circuit.
Others, such as the underwater log and compass,
furnish vital navigational information.
The majority of the systems are electrical
and automatic in operation. Some, such as the
motor order telegraph system are manually
operated but include an electrical circuit for the
actual transmission of the order to another part
of the ship. Some of the systems operate on
alternating current, others on direct current;
still others, such as the tachometer and
sound-powered telephone systems operate on
self-generated current.
The various systems and their components
are described in this and following chapters.
The I.C. systems of a modern fleet type
submarine usually consist of about 24 circuits.
With few exceptions, they are supplied with
power through the I.C. switchboard located in
the control room.
The following is a list of important I.C.
circuits and their circuit designations:
Telephone call system (circuit E)
Engine governor control and tachometer
system (circuit EG)
Battle telephone systems (circuits JA and
XJA)
Engine order control system (circuit 3MB)
Dead reckoning tracer system (circuit TL)
Collision alarm system (circuit CA)
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General alarm system (circuit G)
Diving alarm system (circuit GD)
Low-pressure lubricating oil and high-temperature
water alarm system (circuit EC)
Shaft revolution indicator systems (circuit K)
Gyrocompass system (circuit LC)
Auxiliary gyrocompass system (circuit
XLC)
Motor order telegraph system (circuit 1MB
and 2MB)
Marker buoy system (circuit BT)
General announcing system (circuit 1MC)
Submarine control announcing system (circuit 7MC)
Rudder angle indicator system (circuit N)
Bow and stern plane angle indicator system
(circuits NB and NS)
Auxiliary bow and stern plane angle
indicator system (circuits XNB and XNS)
Main ballast indicator system (circuit TP)
Hull opening indicator system (circuit TR)
Underwater log system (circuit Y)
Bow plane rigging indicator system
In addition, the following circuits which are
not part of the I.C. systems, are supplied
through switches on the I.C. switchboard:
Torpedo data computer (circuit GA-1)
Torpedo data computer (circuit 17GA-1)
Torpedo firing (circuit 6PA)
Torpedo ready lights (circuit 6R)
Target designation system (circuit GT)
8A2. Systems requiring alternating current.
The following systems require alternating current
for operation:
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Self-synchronous operated motor order telegraph
and indicator systems (for main propulsion orders)
Self-synchronous operated diving plane
angle indicators (bow and stern planes)
Self-synchronous operated rudder angle indicator
system
Hull opening and main ballast tank indicator systems
Hydrogen detector
Lubricating oil (low pressure) and circulating
water (high temperature) alarm systems
Telephone selective ringing system
General announcing systems (alarm signals
and voice communication)
Self-synchronous operated underwater log
system
Self-synchronous operated propeller shaft
revolution indicator system
Target designation system
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Engine governor control system (direct
current on latest submarine)
Torpedo data computer (circuit GAl)
8A3. Systems requiring direct current. The
following systems require direct current for
operation:
Marker buoy system
Engine order indicator system (alternating
current on older submarines)
Searchlight
Auxiliary gyrocompass
Torpedo data computer (17GA-1)
Torpedo firing
Torpedo ready lights
Engine governor control system
Auxiliary bow and stern plane angle indicating systems
Resistance thermometer systems
Gyrocompass system
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8B1. Interior communication switchboard.
a. Description. The I.C. switchboard is usually
located on the starboard side of the control
room. The switchboards on the latest type submarines
are equipped with snap switches and
dead front fuses, with blown fuse indication,
mounted directly below or on either side of each
switch requiring fuses. Earlier type submarines
used knife switches with fuses mounted immediately
below each switch.
b. Source of power. The alternating current
power supply to this switchboard is obtained from
the I.C. motor generators which are
comprised of either 250-volt d.c. motors and
120-volt a.c. generators, or 120-volt d.c. motors
and 120-volt a.c. generators, depending upon
the type of installation. The former would take
its power directly from the batteries, the latter
from the lighting system. If the supply is taken
from the lighting system, the installation is also
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equipped with an emergency supply obtained
from a center tap off the battery through a
double throw switch, for use in the event of
failure of the lighting motor generator set.
The direct current power supply to the
switchboard comes from the lighting system. An
auxiliary supply of direct current for the gyro
compass and torpedo data computer may be
obtained from a rectifier which receives its power
supply from the alternating current bus.
Fused switches are supplied for the primaries of
each of the two 120/8 volt transformers for the
6-8 volt circuits, and for the
searchlight. One spare fused switch is provided,
wired into the direct current bus, and 2 spare
switches are wired into the alternating current
bus.
Figure 8-1 is a simplified diagram showing
the I.C. power supply system and controls.
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