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2.5
Wiring Specifications
Induced noise (transfer of electrical energy from one wire to another) can interfere
with telephone communication or cause false alarms. To avoid induced noise, follow
these guidelines:
•
Isolate input wiring from high current output and power wiring. Do not pull one
multi-conductor cable for the entire panel. Instead, separate the wiring as follows:
•
Do not pull wires from different groups through the same conduit. If you must run
them together, do so for as short a distance as possible or use shielded cable.
Twisted, shielded wire on the Audio Circuits is recommended for maximum
protection against EMI and AFI emissions and susceptibility. Connect the shield to
earth ground at the panel. You must route high and low voltages separately.
•
Route the wiring around the inside perimeter of the cabinet. It should not cross the
circuit board where it could induce noise into the sensitive microelectronics or pick
up unwanted RF noise from the high speed circuits. See Figure 2-4 for an
example.
•
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.
54711
SLC loops
Relay circuit
Before you Begin Installing
Audio circuits
2-5
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