i-on16 Before You Begin
Page 7
Keypad Cabling
Requirements
Cable Type
In general, the control unit requires standard 7/0.2
un-screened alarm cable for wiring to keypads.
Screened cable may prove necessary if the
installation site has equipment that produces high
levels of R.F. (Radio Frequencies), for example
welding equipment. If screened cable is required,
you should keep to the following guidelines:
1. Avoid earth loops by connecting the screen on
the cable to mains earth at the end station but
not at the keypad.
2. The continuity of the cable screen is most
important and screens MUST be continuous
along the full length of the cable.
3. If the cable enters any metal enclosure, ensure
the screen is isolated from the case.
Cable Segregation
Segregate the keypad cabling from any other
wiring, such as mains supply cables, telephone
cables, computer network cables and R.F. cables.
Use cable ties to keep cables separated.
Keep the keypad cable clear of cables supplying
sounders or extension loudspeakers.
Cable Configuration and Length
You can connect up to two keypads to the end
station. You may connect the keypads either
serially, or in parallel at the end station connector.
The cable length from control unit to the most
distant keypad should not exceed 100m.
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