Bell System 801 Door Entry Handset - White

Product Information

Bells (BSTL) 801 series handset is installed in thousands of installations in the UK, being one of the most popular handsets available.

I've just bought a replacement handset (Bell 801) for my door entry system. The existing phone that I'm replacing has 5 wires going to different parts of the handset but their destinations are marked A B C etc. It appears to be an old "Entryphone" handset One of the most popular kits on the market, the Bell 901 kit features a high quality intercom panel manufactured from 3 mm anodised aluminium with a brushed finish. x aforementioned circuit cables (looping either side of apartment building), each side using 4 coloured wires (1 wire for each apartment) & common red. Posting in this forum as my 'issue' is similar to the OP - and desperately hoping for a swift reply.Unfortunately, but unsurprisingly, the new unit didn't come with any wiring schematics - or indications that it required 4+1 wires.

The 'loop' system serves as a single cable supplying 4 apartments (4 apartments on the left side), and the same on the other (4 apartments on the right side). The kit comes complete with the 801 handset, which is one of the most popular handsets in the UK. Built from ABS plastic it is highly durable and with its smooth finish it is easy to keep clean. It is possible to have up to three handsets per button if required. It had a speech unit (which allowed the 'resident' to hear the 'guest/visitor', and I assume the other way as well, perhaps?).

The incoming wiring has red, blue (x2, for 2-way speech I presume), brown, grey (or at least it now looks grey after 20 or so years) and orange wires. The orange one goes to a single terminal (B) and then carries on to two other terminals (F and G). The others all go to single terminals. So...