SILENT KNIGHT SK-4224, Инструкция по установке и эксплуатации

Страница: 14 / 64

Before You Begin Installing
151068 3-7
3.8 Wiring Specifications
Induced noise (transfer of electrical energy from one wire to another) can cause false alarms
or interfere with control panel operation in other ways.
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:
High current input/output: AC power and notification appliance wiring
Low current input/output: Annunciator and zone circuit wiring
• 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. Connect the shield
to circuit ground at the panel. You must route high and low voltages separately.
• Route the wiring within the cabinet 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. See Figure 3-4 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.
Figure 3-4 Wire Routing Example
Important! Do not run 120 VAC line voltage in fire alarm raceways.
firealarmresources.com