Electrical services are a vital and costly component in any modern building. It is therefore essential that construction industry professionals in training and in their early years of practice understand the basic principles of services design. This book covers methods of wiring, schemes of distribution and protection for lighting and power installations for buildings of all types. Other electrical systems such as fire alarms, call systems, lifts, standby supplies and lightning protection are also covered. For each, the methods of design are described in detail, with examples of calculations. For this third edition the section on hazardous areas has been substantially extended and new developments in alarms and warning systems using solid state electronics,have been included. The chapter on lightning protection has been revised to conform with the latest standards and a section on uninterruptible power supplies has been added.