Chapter 2. Installation/System Checkout
2-14
AC Supply Wiring
Adhere to the following guidelines when wiring AC Power.
• AC power must be wired from a dedicated circuit
breaker or fuse, rated 20 A, per NFPA-72, NEC, and
local codes.
• Before handling AC feed, verify that it is not live using
a voltmeter. Make sure the circuit is de-energized and
tagged to prevent injury.
• AC supply wiring must be 14 AWG minimum to 12
AWG maximum.
• Connect a 12 AWG copper ground wire from safety
ground in the electrical distribution panel to the panel
safety ground stud.
• Input voltage range:
- 120 VAC, 60 Hz
- 240 VAC, 50Hz
- No configuration settings required to select.
• The Expansion Power Supply (EPS) is an option, and
requires AC power when used. Connect the Black/
White AC harness from the EPS to the TB4 AC input
terminals on the MSB. Wire Black to the left terminal of
TB4. Wire White to the right terminal of TB4.
• AC wiring is supervised. Safety ground wire is not
supervised.
• Supply Power Requirements
- 120 VAC 60 Hz, 4A maximum
- 240 VAC 50 Hz, 3A maximum
• AC feed must be routed in the wiring area below the
MSB, in the area designated "not power limited".
• Before applying AC power to the system, connect the
batteries per the instructions on the following page and
replace the protective cover.
• Wire “LINE” to the left terminal of TB4. Wire “Neu-
tral” to the right terminal of TB4.
Figure 2-16 AC Supply Wiring
TB1
DANGER
HIGH VOLTAGE
IN THIS AREA
DACT TELEPHONE
CONNECTIONS
EXPANSION POWER SUPPLY ASSY.
NAC MODULE
TB2
THE POWER SUPPLY MODULE, PART OF THE EPS
ASSEMBLY, IS MOUNTED BENEATH THE NAC MODULE
PORTION OF THE EPS ASSEMBLY.
734 - 179
WIRE AC LINE AND NEUTRAL AS SHOWN.
HOT TO LEFT TERMINAL, NEUTRAL TO RIGHT TERMINAL.
WHITE
LINE
NEUTRAL
BLACK
WHITE / BLACK HARNESS 734 - 179
FROM EPS (LOWER MODULES)
TO MAIN SYSTEM BOARD.
EPS
POWER SUPPLY MODULE
TB5
1 2 3 4 5 6 7 8
TB1
B+ B- B+ B- A+ A-
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8
1 2 3 4 5 1 2 3 4 5 6 7 8
TB3
MAIN SYSTEM BOARD - ADDRESSABLE (MSB - A)
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