30 EVS Series Manual — P/N LS10062-001SK-E:D 3/15/2022
EVS Device Installation Installing the EVS-125W
4.5.4 Wiring Specifications
All wiring and devices installed in the system must meet the standards described in National Electrical Code (NFPA 70), NFPA Standard 72,
and Life Safety Code (NFPA 101).
To avoid induced noise (transfer of electrical energy from one wire to another), keep input wiring isolated from high-current output and
power wiring. Avoid pulling one multi-conductor cable for the entire panel.
Separate wiring as follows:
DO NOT pull wires from different groups through the same conduit.
Twisted, shielded wire is recommended for all audio circuits to provide the maximum protection against EMI and AFI emission and suscep-
tibility.
If using shielded cable, attach the shield to earth ground on the control 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 beads or by wrapping it around a ferrite toroid core. Figure 4.27 provides an example.
4.5.5 Speaker Wiring
Each EVS-125W supplies four NACs (Notification Appliance Circuits) for speaker connection. The speaker circuit can be supervised and
wired Class B or Class A. Speaker circuit 1 is capable of 100 watts of power at 25 Vrms. Speaker circuit 2-4 are capable of 50 watts (each) at
25 Vrms.
Maintain 0.25” spacing between Input/Output Type: Wiring
each of these circuit types; Non Power-Limited: AC power, Standby batteries
as well as between power-limited Power-Limited: SBUS, VBUS
and non power-limited circuits. Audio: Speaker
ON
12345
B
A
T
T
E
R
Y
+
–
CIRCUIT 4 CIRCUIT 3 CIRCUIT 2 CIR CUIT 1
IN
IN IN IN
+
+++
–
–––
OUT
OUT OUT OUT
+
+++
–
–––
AUDIO EXPANDER
CIRCUIT 5 CIRCUIT 6
CIRCUIT 8 CIRCUIT 7
+ –OUT + –OUT
+ –OUT + –OUT
+ –IN + –IN
+ –IN + –IN
AUDIO EXPANDER
VBUS
SBUS
audio
circuits
AC power
battery
cable
audio
circuits
Maintain 0.25” spacing
between power-limited and
non power-limited wiring.
EVS-125W
EVS-CE4
audio
circuits
Figure 4.27 Wire Routing Example for the EVS-125W