Electrical/Electronic Drawings
Introduction
The major difference in electrical prints and electronic drawings is that
electronic drawings are usually more difficult to read because they show
more complex circuitry and systems. Interpreting either electronic or
electrical prints requires you to recognize and understand the graphics
symbols for electrical diagrams and the electrical wiring equipment symbols
shown in Graphic Symbols for Electrical and Electronic Diagrams, ANSI
Y32.2, and Electrical Wiring Equipment Symbols for Ships’ Plans, Part 2,
MIL-STD-15-2.
Electrical
drawings
The Navy uses electrical drawings for shipboard electrical equipment and
systems, shore-based power, lighting, and communications equipment, and
aircraft electrical equipment and systems. Electrical drawings may be further
divided into pictorial wiring diagrams, isometric wiring diagrams, single-line
diagrams, schematic diagrams, elementary wiring diagrams, and block
diagrams.
PICTORIAL WIRING DIAGRAMS: Pictorial wiring diagrams are pictorial
sketches of various parts of an item of equipment and the electrical
connections between the parts.
ISOMETRIC WIRING DIAGRAMS: An isometric wiring diagram shows
the outline of a ship or aircraft or other structure and the location of
equipment such as panels, connection boxes, and cable runs.
SINGLE-LINE DIAGRAMS: Lines and graphic symbols simplify complex
circuits or systems in a single-line diagram.
SCHEMATIC DIAGRAMS: A schematic diagram shows how a circuit
functions electronically.
ELEMENTARY WIRING DIAGRAMS: Elementary wiring diagrams show
in simplest form how each individual conductor connects to various
connection boxes of an electrical circuit or system.
BLOCK DIAGRAMS: Major equipment components or systems reduced to
simple geometric form and displayed in normal order of progression of signal
or current flow by single lines comprise block diagrams.
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