A terminal board serves
as a common point
same polarity, and
carries less current than a bus bar. The
terminal boards using the letters TB. See
figure 1-6 for the
symbol for a terminal board.
Symbol for a Terminal Board.
Lamps. The diagrams use the lamp symbol in two ways. Examine
the symbol given for a lamp in appendix A.
When a diagram
uses the symbol as shown in the appendix, it indicates a lamp
that lights a meter.
However, to show an indicator lamp that lights to give
information about a system, a letter appears in the symbol.
The letter in the symbol indicates the color of the lens on
the lamp. For example, the letter in the symbol may be G for
green, R for red, and Y for yellow (or amber).
diagrams, lamp has the designation DS.
Depending on the contents of the diagram, it will contain any one of,
or a combination, or all indexes described below to help locate
components, circuits, circuit breakers, busses, relays, and slip
rings connections. Additionally, the diagram may give illustrations
of the connectors referenced in the diagram.
Component Index. Due to the large number of components used
in the circuits, you must have a means to identify them. The
component index provides a way to identify the components.
Look at the component index on sheet 1 of the hull elementary
wiring diagram (appendix A).
You find it gives the
designation code, nomenclature, part number, and sheet
number(s) where you find the component. With the exception of
the designation code (DESIG), all the headings in this index
are self- explanatory.
Designation code. This index assigns an alphanumeric code
to the majority of the components shown in the diagrams.
Using this code and the other information given in the
index, you can locate most components used in the circuits
Additionally, when you find a
is, you can return to component index and use the
designation code to identify the component.