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Zeta Alarm Systems.
3 . 2 G r o u n d i n g I n s t r u c t i o n s
For bare board installation, ground board by attaching green grounding wire from J1 on board
to earth ground.
For ZNDC enclosure installation, ground board by attaching green grounding wire from J1 on
board to threaded stud in lower left-hand corner of enclosure. Secure with nut. Connect enclo-
sure to earth ground. See Illustration 3.3A.
3 . 3 W i r i n g
3 . 3 . 1 W i r i n g P r e c a u t i o n s
Maintain ¼" spacing between high and low voltage circuits and power limited and non-power
limited circuits as per the National Electrical Code Article 780.
Induced noise (transfer of electrical energy from one wire to another) can interfere with telephone
communication or even cause false alarms. To avoid induced noise, follow these guidelines:
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.
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 torroid.
Route the wiring around the inside parameter of the enclosure. 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.
Revision 1.0
WIRE ROUTING DIAGRAM - NDC IN ENCLOSURE
ILLUS. 3.3A
LINE 1
LINE 2
J1
TO RJ31X CONNECTORS
Figure 3.3A
Part # MAN-ZNDC-01
ZNDC Installation and Operation Manual
GND
24V
_
+
TO NETWORK
CONNECTION AT FACP
Page 8
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