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3.2 Cabling
Connection between the internal and external intercoms is by 2 core cable and
must be no more than 70 m long. Two core (13 x 0.2) bell fl ex is suitable.
A 15m length (2 lengths for DCA2) of 2 core cable is supplied with the kit and
existing bell cable runs can be made use of.
The cable run should be kept at least 100mm away from mains cables to avoid
interference.
A second relatively short 2 core cable (13/0.2 bell fl ex) will be required between
the external intercom and the door catch (if used).
A further 2 core cable (13/0.2 bell fl ex) will be required (if extension beyond
15m is necessary) between the external intercom and the second internal
intercom for the DCA2.
4. Fixing Intercoms
4.1 External intercom
Important: To give the best possible waterproofi ng and appearance
we recommend taking the wiring through the exterior wall directly
behind the external intercom so that the cabling will feed directly
through the back box wiring slot. If the surface to be fi xed to is not
even (e.g. pebbledash or brickwork with raised pointing) we recommend
the use of at least 10mm (3/8") thick marine ply as a mounting plate
between the wall and the back box to prevent its distortion and loss of
waterproofi ng.
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