
9752 Installation Guide 3. Installation
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Usage other than approved usage or failure to comply with the installation and
programming instructions may invalidate any approval given to the apparatus
if, as a result, the apparatus ceases to comply with the standards against
which approval was granted. Note the approval label on the main PCB.
In the event of problems you should contact your equipment supplier in the
first instance.
Ringer Equivalence Number
The Ringer Equivalence Number (REN) of the built-in communicator is 1. As a
guide to the number of items that can be simultaneously connected to an
exclusive line, the sum of the REN values should not exceed 4. A standard
telephone (as provided, for example, by BT in the UK) has a REN value of 1.
Safety Notice
Figure 22 identifies connectors for Safety Extra-Low Voltage (SELV) and
Telecommunications Network Voltage (TNV) circuits on the control unit's main
PCB. These terms are used in accordance with the definitions in Safety
Standard EN60 950.
The Installer must ensure that TNV terminals are connected only to other
circuits designated as TNV circuits (for example, the PTSN) and that SELV
terminals are connected only to other circuits designated as SELV circuits.
Strict adherence to the installation instructions will ensure that the equipment
continues to comply with the safety regulations to which it was approved.
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