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> BS196 Reyrolle
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BS196 "Reyrolle" Connector Details
Connectors to BS 196 were made by Reyrolle Belmos, amongst others, and are occasionally found in venues, either as power connectors or as luminaire connectors. They are more commonly seen in London underground stations!
BS 196 sockets are two-pin, non-reversible, with a scraping earth connection. The fusing in the plug can apply to either pole, or the plug may be unfused altogether. Interchangeability is prevented by means of a keyway which may have any of eighteen different positions, identified by capital letters of the alphabet (see diagram below). They are available with current ratings of 5 A, 15 A or 30 A.
| BS196 Connector Details | |
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| Diagram of BS 196 socket outlet | |
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| Two common keyway positions (from the 18 available) are shown |
Circuit details for wiring BS 196 outlets can be summarised as follows.
- The maximum protective device rating is 32 A.
- All spurs must be protected by a fuse or circuit breaker of rating no larger than 16 A - this means that 30 A outlets cannot be fed from spurs.
- The number of sockets connected to each circuit is unspecified, but proper judgement must be applied to prevent failure of the protective device due to overload.
- Cable rating must be no less than that of the protective device for radial circuits, or two thirds of the protective device rating for a ring circuit.
- On normal supplies with an earthed neutral, the phase pole must be fused and the keyway must be positioned at point B (see diagram above).
- When the socket is fed at reduced voltage from a transformer with the centre tap on its secondary winding earthed (see figure below), both poles of the plug must be fused and the keyway must be positioned at P.
| BS196 Connector Details | |
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| Using a transformer with a centre-tapped secondary winding | |
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| In this configuration, keyway P must be used |
See also
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