 Bell
No. 80 has a metal case (later variants have a plastic case - which looks metallic) which
must be connected to a protective earth if mounted within normal reach. Cabling should be
disconnected at distant end before approaching a Bell 80D on installation or maintenance
visits.Drawing - 93806 (initial date 1977).
DESCRIPTION
Bell No. 80A
Superseded Bell No. 67. Magneto, low impedance, uni-coil ringer, for indoor and outdoor use
on 17 or 25 Hz with 120mm (Bell-gong No. 27A) and 150mm (Bell-gong No. 26A) gongs.
Bell No. 80B
Superseded Bell No. 80A. Similar to Bell No. 80A but with redesigned method of
fixing.
Bell No. 80D
High Impedance 'under-dome' (150mm gong) loud bell, available on rental terms
only.
All the above calling devices are line powered only.
Originally made for BT by Mekelek Ltd
and then by Gemini Connections Ltd.
APPROVAL STATUS
Bell 80D - S/100013/D/021382.
PLANNING
Bell 80D - for interior or sheltered exterior use, up to 105 dB output and requires cabling to
PST system.
Measures approx. 175mm x 150mm x 115mm, weight 1324 grams.
Requires 2
rust-resistant No.10 round head screws and should be mounted 'high' for maximum range.
Cable
entry grommet may be removed to provide 20 mm conduit entry.
REN = 1
INSTALLATION/COMMISSIONING
When wall mounted, the Bell 80D cable entry should face downwards. Where necessary Bell
80D may be earthed by secure connection to conduit or earthing bush fitted to cable entry.
ADDITIONAL INFORMATION
Where the addition of bells tone or callers results in ringing difficulties because the
system is approaching or exceeding REN limitations or capacity of PBX Night bell port, it
may be necessary to fit a 'Convertor Ringing 15' to boost ringing output. |