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Wiring Specifications
To aoid induced noise (transfer of electrical energy from on wire to another), keep input wiring isolated from high current and power wiring. Induced noise can interfere with telephone communications or even cause false alarms. Avoid pulling one multiconductor cable for the entire panel. Instead, separate the wiring as follows:
| 1/4" spacing must be maintained between each of these circuit types; as well as between power limited and non-power limited circuits. |
Input/Output
Type
|
Wiring
|
| High current: | AC power, speaker, and notification devices | |
| Low current: | Annunciator and zone circuit wiring | |
| Audio: | Telephone 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 earth ground at the panel only.
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 throught ferrite shield beads or by wrapping it around a ferrite toroid.
