On 17/01/2004 Alistair Riddell a wrote :
Take the faceplate off and look behind, if there are two wires going to
each terminal then it is part of the ring. If there is only one wire going
to each terminal then it is a spur (or a radial circuit). If there are
three wires then it is part of the ring and already has a spur from that
point on the ring.

Two wires could also indicate that the socket is already a spur and
that another socket has been spured from that one. The only way to be
more certain is to disconnect the two lives, part them and test each to
make sure both are still live.... Not for the faint of heart ;-)

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Regards,
Harry (M1BYT) (Lap)
http://www.ukradioamateur.org