However, upon installing it and trying to mimic the original wiring (from observing the original Intercom & speech module), it became clear that i needed more wires than i have (2 wires from each apartment) : ( 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

Posting in this forum as my 'issue' is similar to the OP - and desperately hoping for a swift reply. 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. The other coloured wires are present, but i now know that they feed the other apartments (see next point, Cabling).The model 801P handset is included in the standard model 900 and VRK audio door entry systems (more than 10 buttons on the door entry panel) as well as the CS and CSP series of combined keypad and proximity door entry systems. The handset uses traditional wiring which is 4 common wires, plus a call wire. Features: I should also point out the old handsets have an internal 'buzzer' within them, which buzzes when a visitor presses the Intercom. It had a speech unit (which allowed the 'resident' to hear the 'guest/visitor', and I assume the other way as well, perhaps?). My goal (if possible) is to simply replace the old 8-way Intercom system with a new unit, using the existing 8 internal handsets, using the existing wiring, and using the existing latch/door-release.

Bell System was established in 1971 as a distributor and installer of door entry telephone and access control systems. In 1979 the installation business was rapidly overtaken by manufacturing following the introduction of its first door entry telephone. Since then the Bell System has firmly established itself as a leading manufacturer of door entry systems. 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). Can anyone help me to identify which wires go where (Z T 0 R 1) on the new handset? Please see the images which include the existing wiring (photo and diagram) at //www.diynot.com/network/DIYJunkie/albums/ Unfortunately, but unsurprisingly, the new unit didn't come with any wiring schematics - or indications that it required 4+1 wires. On this model a switch is included on the side of the telephone to allow the user to mute the call-tone and prevent disturbances from nuisance calls.

Bell 801-IDL | Standard Telephone with Inductive Loop

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. The wiring is a 'loop' system feeding the left & right side of the building. (2 cables, 1 for either side)