BS 546 AC power plugs and sockets: British and related types

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1 bs 546

1.1 2 ampere
1.2 5 ampere
1.3 15 ampere
1.4 30 ampere





bs 546

bs 546 3-pin plugs. left right: 15 a, 5 a , 2 a.


there 4 ratings of plug , socket in bs 546, (2 a, 5 a, 15 a , 30 a). each has same general appearance different physical sizes prevent interchangeability, use pin spacing different 2 pin plugs specified in bs 372, earthed plugs not fit unearthed sockets, , vice versa. plugs fitted bs 646 fuses have been optional since original bs 546:1934 maximum fuse ratings of 2 a in 2 a plug, , 5 a in 5 a, 15 a , 30 a plugs. in practice bs 546 plugs unfused fused versions being unusual , expensive.


the 15 ampere (a) sockets given dedicated 15 a circuit. multiple 5 a sockets might on 15 a circuit, or each on dedicated 5 a circuit. lighting circuits fused @ 5 a used feed 2 a sockets. adaptors available 15 a down 5 a , 5 a down 2 a in practice possible appliance smallest size of flex protected 15 a fuse. similar level of protection seen portable appliances in other countries, less protection offered bs 1363 fused plug.


the larger top pin earth connection, left hand pin neutral , right hand pin line when looking @ socket or @ rear of plug.


2 ampere

this plug used connect low power appliances (and adaptors larger socket types). still used connect lamps lighting circuit.


5 ampere

5 a switched socket-outlet bs 546


this plug corresponds type d in iec table. in uk used moderate sized appliances, either on own 5 a circuit or on multi socket 15 a circuit, , on many adaptors (both multi socket 5 a adaptors , adaptors had 15 a pins). 5 a plug, along 2 a cousin, used in uk centrally switched domestic lighting circuits, in order distinguish them normal power circuits, quite common in hotel rooms. plug once used in theatrical installations same reasons 15 a model below.


15 ampere

15 a switched socket-outlet bs 546


this plug corresponds type m in iec table. largest in domestic use , commonly used in uk indoor dimmable theatre , architectural lighting installations.


30 ampere

the 30 a plug largest of family. used high power industrial equipment 7.2 kw, such industrial kitchen appliances, or dimmer racks stage lighting. plugs , sockets of industrial waterproof design screw locking ring on plug hold in socket against waterproof seals, , sockets had screw cap chained them used when no plug inserted keep them waterproof. use of bs 546 30 a plugs , sockets diminished through 1970s replaced bs 4343 (which later became iec 60309) industrial combo plugs , sockets.








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