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Light sockets

Former Community Member
Former Community Member
Something that has puzzled me for years.


Bayonet cap and Edison screw light bulbs can be removed without tools thus exposing potentially live terminals and presenting a distinct shock hazard.  made worse by the fact that you often need to stand on a chair to remove the bulb.   There are millions of these installed yet the regs seem quite happy with the situation.
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    Its quite a bit more than 100 years, say 111 since the first BS standard covering them, and all the early versions should be out of copyright (70 years since first published, as individual authorship is not ascribed).


    As a point of note BS52 was the standard  number from about 1910 to mid 1981, when it became 5042,  as the standard got updated without changing the number, however the 1933 edition is the earliest of many outdated versions you can get from the BSI in PDF format.


    Actually compared to the standard for lamp holders, the wiring regs are positively a model of stability.


    BS52:1910 1st edition

    BS52 1927 revision 1

    BS 52:1933 rev 2 Bayonet lamp-caps and metal cased bayonet lampholders not exceeding 250 volts

    BS 52:1936 Bayonet lamp-caps. Lampholders and lampholder-plugs (B.C. adaptors) for voltages not exceeding 250 volts

    BS 52:1941. -"-

    BS 52:1952 Bayonet lamp-caps. Lampholders and lampholder-plugs (B.C. adaptors)

    BS 52:1963 Specification for bayonet lamp-caps lampholders and B.C. adaptors (lampholder plugs)

    BS 5042-1:1981 Specification for lampholders and starterholders. Bayonet lampholders

    BS 5042:1987 Specification for bayonet lampholders

    BS EN 61184:1995 -"-

    BS EN 61184:1997, IEC 61184:1997 -"-

    BS EN 61184:2008 -"-

    BS EN 61184:2011 -"-

    The latest is BS EN 61184:2017 Bayonet lampholders


    And its already been reviewed again, so clearly things are changing fast in lampholder world....

    A similar thread of documents exists for edison screw lampholders, the connections for florry tubes, ELV lamps, aircraft lamps, linear lamps..

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  • 0
    Its quite a bit more than 100 years, say 111 since the first BS standard covering them, and all the early versions should be out of copyright (70 years since first published, as individual authorship is not ascribed).


    As a point of note BS52 was the standard  number from about 1910 to mid 1981, when it became 5042,  as the standard got updated without changing the number, however the 1933 edition is the earliest of many outdated versions you can get from the BSI in PDF format.


    Actually compared to the standard for lamp holders, the wiring regs are positively a model of stability.


    BS52:1910 1st edition

    BS52 1927 revision 1

    BS 52:1933 rev 2 Bayonet lamp-caps and metal cased bayonet lampholders not exceeding 250 volts

    BS 52:1936 Bayonet lamp-caps. Lampholders and lampholder-plugs (B.C. adaptors) for voltages not exceeding 250 volts

    BS 52:1941. -"-

    BS 52:1952 Bayonet lamp-caps. Lampholders and lampholder-plugs (B.C. adaptors)

    BS 52:1963 Specification for bayonet lamp-caps lampholders and B.C. adaptors (lampholder plugs)

    BS 5042-1:1981 Specification for lampholders and starterholders. Bayonet lampholders

    BS 5042:1987 Specification for bayonet lampholders

    BS EN 61184:1995 -"-

    BS EN 61184:1997, IEC 61184:1997 -"-

    BS EN 61184:2008 -"-

    BS EN 61184:2011 -"-

    The latest is BS EN 61184:2017 Bayonet lampholders


    And its already been reviewed again, so clearly things are changing fast in lampholder world....

    A similar thread of documents exists for edison screw lampholders, the connections for florry tubes, ELV lamps, aircraft lamps, linear lamps..

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