16th Edition (reference only) – NOW superseded by the 17th Edition IEE Regulations.

chapter 5

chapter 6

Installation control and protection
  3.1 - Introduction 3.5 - High temperature protection
  3.2 - Switching 3.6 - Overload currents
  3.3 - Isolation 3.7 - Protection from faults
3.4 - Electric shock protection

3.8 - Short circuit and overload
------- protection

3.2.4 Functional switching

Functional switching is used in the normal operation of circuits to switch them on and off. A switch must be provided for each part of a circuit which may need to be controlled separately from other parts of the installation. Such switches are needed for equipment operation, and a group of circuits can sometimes be under the control of a single switch unless separate switches are required for reasons of safety. Semiconductor switches may control the current without opening the poles of the supply. Fuses and links must not be used as a method of switching.

A plug and socket may be used as a functional switching device provided its rating does not exceed 16 A. It will be appreciated that such a device must not be used for emergency switching (see {3.2.2}).


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Extracted from The Electricians Guide Fifth Edition
by John Whitfield

Published by EPA Press Click Here to order your Copy.

Click here for list of abbreviations