Wiring Precautions; Model 4720 Control Panel Installation; Selecting A Location - Regency 4720 Installation Manual

Regency ® Model 4720 Control/Communicator Installation Manual (P/N 150476, Rev. A)

Wiring Precautions

5
To avoid induced noise (transfer of electrical energy from one wire to another), keep input wiring isolated from
high current output and power wiring. Induced noise can interfere with telephone communication, or even cause
false alarms. Avoid pulling one multiconductor cable for the entire panel. Instead, separate the wiring as follows:
• High current input/output: AC power and speaker and bell wiring
• Low current input/output: Touchpad and zone loop wiring
• Audio input/output: Telephone wiring
Wires from different groups should not be pulled through the same conduit. If you must run them together, do so
for as short a distance as possible, or use shielded cable. Connect the shield to circuit ground at the panel.
For the same reasons, wiring within the cabinet should be routed around the perimeter of the cabinet. It should not
cross the printed circuit board, where it could induce noise into the sensitive microelectronics, or pick up unwanted
RF noise from the high speed circuits.
High frequency noise, such as that produced by the inductive reactance of a speaker or bell, can also be reduced by
running the wire through ferrite shield beads, or by wrapping it around a ferrite toroid.

Model 4720 Control Panel Installation

6

Selecting a Location

6.1
When selecting a location to mount the Model 4720 control panel consider the following factors. The unit
should be mounted where it will not be exposed to extremes in temperature and it will be free from
moisture. The panel should be accessible to "main drop" wiring runs. The 4720 should be located well
within the secured area but should be accessible for testing and service.
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Revised 10/98