Unit 1. Producing Electrical and Electronic Drawings
Unit objectives
At the end of this unit learners will be able to:
Draw convention representation of various electrical components
Write full meaning of some common abbreviations as used in engineering drawing
Draw wiring/schematic diagrams
1.1 Abbreviations commonly used in engineering drawing
In engineering drawing it is easy to represent an object using two or more views by the principle of
projection. But it will take time to draw views of various components and accessories such as nuts, bolt
heads, motors, resistors, capacitors, transformers etc. Therefore, to save time some conventions as well as
symbols are used to convey the necessary information of these components. The conventions and symbols
must be standardized so that they convey the same meaning to everyone who reads the drawing. Below is a
list of some of the commonly used abbreviations in engineering drawing.
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1.2 Symbols for Electrical and Electronic Engineering Drawing
The schematics symbols for most major electrical components used in electrical and electronic engineering
have been given in table 1. However, each component may have numerous possible representations. In cases
where there is more than one common symbol an alternate representation has been given.
Table 1
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