17TH EDITION IET WIRING REGULATIONS WIRING SYSTEMS FIFTH EDITION PDF
The aim of this book is to help the reader to approach the drawing
and interpretation of electrical diagrams with confidence, to understand the principles of testing and to apply this knowledge to fault finding in electrical circuits.
The abundant colour diagrams with associated comments and explanations lead from the basic symbols and simple circuit and wiring diagrams, through more complex circuitry, to specific types of wiring systems and, finally, to the methodical approach to fault finding.
The new edition has been brought fully in line with the 17th Edition
IET Wiring Regulations.
Important terms/topics covered in this chapter:
■ BS EN 60617 symbols
■ Circuit convention
■ Relay logic
By the end of this chapter the reader should:
■ be aware of the correct symbols to be used on diagrams,
■ know the different types of diagrams in general use and why they are
■ understand circuit convention and its importance in interpreting
■ understand simple relay logic and its application to PLCs.
This is an area often overlooked or even ignored. The IET Wiring Regulations require that ‘diagrams, charts, tables or equivalent forms of information are made available’ to the installer and inspector and tester.