Chapter 3 Power Distribution, IC Swit Chboards, and Controllers

CHAPTER 3

POWER DISTRIBUTION, IC SWITCHBOARDS, AND

CONTROLLERS

LEARNING OBJECTIVES

Upon completion of this chapter you will be able to do the following:

Describe the various electrical distribution systems installed on board Navy

ships.

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:

INTRODUCTION

vital, semivital, and nonvital.

A ship's electrical equipment requires a constant

uninterrupted supply of power to function properly.

Vital Systems

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

Semivital Systems

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

controllers.

system.

Nonvital Systems

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.

READINESS

IMPORTANCE

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

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