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BT Versatility
Installation and Maintenance Manual
3
Safety Precautions during installation and system upgrades
Always unplug or isolate the mains supply when installing or upgrading the system.
After installing the central control unit (CCU) and all required modules, ensure
that the following points are checked before switching the mains power on:
• The cabled extensions have a DTMF telephone or a (V8/V16) Featurephone
connected.
• The CCU cover is in place and locked.
After switching on the Mains allow approximately 30 seconds for the CCU to go through its power up
routine.
Electrostatic precaution (ESP)
The BT Versatility contains electrostatic components. To ensure long-term reliability of the system,
electrostatic precautions should be taken when handling any of the system PCBs that are not enclosed in
plastic. An ESP pillar is located on the CCU MDF.
Lightning and surge voltage protection
Extension cabling should not be exposed to high voltage surges, (for example,
surges induced by lightning or neighbouring high current-carrying cables). If
this is a possibility, external protection of the Main Equipment and Extensions
using ‘earthed line surge protectors’ is essential.