POWER DISTRIBUTION, IC SWITCHBOARDS, AND
Upon completion of this chapter you will be able to do the following:
Describe the various electrical distribution systems installed on board Navy
Describe the characteristics, construction features, and functions of the vari-
ous types of IC switchboards.
Describe a typical IC power distribution system.
Identify the various switchboard components used with IC switchboards.
Identify IC circuits by their classification.
Describe a typical IC test switchboard.
ship. There are three classifications of importance:
vital, semivital, and nonvital.
A ship's electrical equipment requires a constant
uninterrupted supply of power to function properly.
The ship's service power distribution system, the
An IC system classified as vital (V), if disabled,
emergency power distribution system, and the
casualty power distribution system provide power for
would seriously impair the fighting effectiveness and
the IC switchboards and other IC systems aboard ship.
maneuverability of the ship.
As an Interior Communications (IC) Electrician, you
should become familiar with these different power
sources. Your duties as an IC Electrician includes
An IC system classified as semivital (SV), if
troubleshooting, repairing, and maintaining power
disabled, would impair the fighting effectiveness of
distribution systems assigned to your division. This
the ship to a lesser extent than the loss of a vital
includes switchboards, power supplies, and motor
IC SYSTEMS CLASSIFICATION
An IC system classified as nonvital (NV), if
disabled, would not impair the fighting effectiveness
IC systems are classified by importance,
or maneuverability of the ship.
readiness, and designation.
IC systems are also classified according to the
The importance classification defines the extent to
extent to which a system contributes to the operational
readiness of the ship. There are four classes of
which a system affects the fighting effectiveness of the