BS 5125:1990

This standard BS 5125:1990 Specification for 50 A 650 V flameproof, restrained and bolted plugs and sockets for use in coal mines is classified in these ICS categories:

• 29.120.30 Plugs, socket-outlets, couplers
• 29.260.20 Electrical apparatus for explosive atmospheres

This British Standard specifies the dimensional and test requirements for 50 A flameproof restrained and bolted plugs and sockets suitable for voltages not exceeding 650 V, primarily intended for use with mining apparatus which is connected to its power supply by means of a flexible cable. These plugs and sockets incorporate three power contacts, one pilot contact for electrical interlocking, and a scraping earthing contact. Provision is also made for cable couplers, to enable lengths of flexible cable to be coupled together.

NOTE 1 The figures in this standard show only those essential features and dimensions for function and interchangeability.

NOTE 2 Appendix A lists the information to be supplied by the purchaser.

NOTE 3 The titles of publications referred to in this standard are listed on the inside back cover.

Specifies dimensional, construction and test requirements for plugs and sockets for flexible cables having three power and one pilot contacts and a scraping earth contact.