Many thanks for your reply
Zomaar wrote:
> When you removed the cable from the alarm panel, were the wires touching
> each other?
>
No, I made sure that the wires were not touching.
> When you disconnect the bottom faceplate from the main BT socket, call your
> number from a mobile - is your number busy?
Unfortunately I didnt try this at the time.
>
> Remove the top part of the BT master socket - are there 2 different cables
> attached to the screw connections?
This is the odd bit. I did remove the whole BT faceplate, and there were
three sets of wires, two coming from different directions from the
inside (one had black insulation, and the other white). The third one
was mounted on the surface but DID NOT plug into the removable bottom
faceplate; this was the wire that went to the alarm. Also behind the
faceplate were two wires connected with those plastic connectors with
oil in them. At the time I thought this was rather odd because one would
normally just patch through the wire through the Krone connection.
Thinking about it, I now suspect that the main phone line going in would
be the one with black insulation since that type of cable tends to be
used for external wiring; perhaps rather than going straight into the
master socket, the cable was patched (with the two cable connectors) to
the alarm, then back again into the master socket? She has got an
extension cable upstairs which may explain the third set of wire coming
in.
Unfortunately I was so baffled by the cable configuration at the time
that I did not think of taking photos of it or tracing the colours of
the wires from the alarm panel which would have been useful.
Apparently, when the upstairs extension was fitted by BT, the engineer
commented that the cabling was done upside down or something to that
effect.
>
> Find the point where the phone cable enters your house - there should only
> be 1 cable out from there and it should go directly to your master socket.
>
It is a relatively new build so apart from the wiring to the alarm panel
which is tacked onto the wall, everything else is concealed.