BS 5581:1978

This standard BS 5581:1978 Specification for low voltage switchgear and controlgear for industrial use. Terminal marking and distinctive number for particular control switches is classified in these ICS categories:

• 29.130.20 Low voltage switchgear and controlgear

This standard applies to control switches according to IEC Standard 337-1, with two definite positions (such as push-buttons, limit-switches and similar devices), irrespective of their construction, having terminal marking in accordance with the corresponding marking of contactor relays designated by the distinctive letter E (see EN 50011).

The use of this standard is recommended where terminal marking is a requirement of the relevant standard for control switches, or is usual practice.

Detailed rules for control switches based on the general rules of BS 5472:1977 [EN 50005].