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. 4 5 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 6 8
