This document: – establishes a working definition for switches and their constituent parts and identify the main types; – specifies the minimum requirements for the manufacture of the switches and/or constituent parts; – specifies codes of practice for inspection and manufacturing tolerances of both full and half sets of switches and their constituent parts; – establishes the limits and scope of supply; – lists the methods by which switches and their parts should be identified and traced; – lists the different and varying ways by which switches can be described using the following parameters: – geometry of the switches; – types of construction; – performance requirements; – design criteria; – tolerances and inspection.