Figure 3-9.-Block diagram of a steering system.

In IC circuits, for example, the lugs on the wires to

WIRING DECK PLAN

each connection box are stamped with the conductor

marking. The elementary wiring diagrams show the

The wiring deck plan is the actual installation

conductor markings alongside each conductor and how

diagram for the deck or decks shown and is a blueprint

they are connected in the circuit. Elementary wiring

used chiefly in ship construction. It enables the shipyard

diagrams usually do not show the location of connection

electrician to lay out the work for a number of cables

boxes, panels, and soon; therefore, they are not drawn

without referring to each isometric wiring diagram. The

to any scale.

plan includes a bill of material that lists all the materials

and equipment necessary to complete the installation for

ELECTRICAL SYSTEMS DIAGRAMS

the deck or decks concerned. Equipment and materials

except cables are identified by a symbol number both

Various types of electrical systems are installed

on the drawing and in the bill of material.

aboard Navy ships that include many types of electrical

Wiring deck plans are drawn to scale (usually 1/4

d e v i c e s and components. These devices and

inch to the foot); therefore, they show the exact location

components may be located throughout the ship. The

of all fixtures. One blueprint usually shows from 150 to

electrical diagrams and drawings necessary to operate

200 feet of deck space on one deck only. Electrical

and maintain these systems are provided by the ship's

wiring equipment symbols from MIL-STD-15-2 are

electrical blueprints and by drawings and diagrams

used to represent fixtures as in the isometric wiring

contained in NSTMs and manufacturers' technical

diagram.

manuals.

ELEMENTARY WIRING DIAGRAM

BLOCK DIAGRAMS

Block diagrams of electrical systems show the

The elementary wiring diagram shows in detail each

major units of the system in block form. These diagrams

conductor, terminal, and connection in a circuit.

are used with text material to present a general

Elementary wiring diagrams are used to check for

description of the system and how it functions. Figure

proper connections in a circuit or to make the initial

3-9 shows a block diagram of the electrical steering

hookup.

Figure 3-9.-Block diagram of a steering system.

3-15