That starts to make a lot more sense.
To enlarge upon it.
The Mains Supply could originate under the the Pink Round Cover and connect directly to the 3-way Terminal Block - on a 2 wire, Live and Neutral only basis.
That (probably-) live feed is then taken through the shorter, upper, horizontal cable, under the White Round Box, to the Bell Push outside, returning through another wire in the same cable, to the 3-way Terminal Block.
Where that Switched Return Wire and probably the Unswitched Neutral are taken downwards through the vertical, pink-painted cable to Andrew's "Presume Doorbell", the "Mains" cabling terminating there.
Leaving the other longer, horizontal, over-painted cable as the PSTN/phone cable, coming through the same "hole-in-wall" to traverse through the white, round box; and out horizontally to disappear behind the pipe/s, to reappear to connect to and enter the other white "rectangular" box in the second photo.
Exactly what that second-photo box is, is not absolutely clear, either a rather large junction box or could it be a modem, given that Konrad has said that the other cable from its top, connects to the "Router"; and looks as though it may have an RJ series connector, as Xrayspex suggested.
Generally a satisfactory explanation for the internal wiring; but it does leave the question of -
"What are the arrangements out by the Bell Push, as its own (Mains) wiring by definition returns in to the house (I hope), whilst the PSTN/Phone wiring has to proceed onwards, to reach the PCP equivalent and the Exchange, somehow?"
I wonder if Konrad could clarify that aspect, by producing a photo?
Agreed about the RF source and emissions; and being effectively "White Noise" spread across a wide spectrum-
Back EMF = -L * dI / dT
where-
L is the Inductance in Henries
dI is the change of Current in Amps
dT is the change of Time in Seconds.
dI could be in the one or 2 Amp area,
dT could be extremely small, micro- and milli-seconds,
so that this intermediate Resultant could be very large,
whilst L for the Bell Coil/s could again be a fair size
Final result - plenty of sparks and interference!
I remember the shocks induced when playing about with PO Relays, using about a 12 Volt supply.
Edited by deleted (Sun 09-Feb-14 14:49:10)



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