Chapter 2. Installation and System Checkout
2-14
Connecting to AC Power
• Before handling AC feed, use a voltmeter to verify the
feed is not live. Make sure the circuit is de-energized
and tagged to prevent injury.
• AC feed must be routed in the wiring area below the
main system board, in the area designated “not power
limited.”
• AC power must be wired from a dedicated circuit
breaker or fuse, rated 20 A, per NFPA-72, NEC, and
local codes.
• 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 main system board. 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, 2A maximum
- 240 VAC 50 Hz, 1.5A maximum
1. Remove insulating cover marked with the high voltage
warning.
2. Connect AC feed wires to terminal block located at bot-
tom left of board. Terminals are labeled LINE (120V)
and NEUTRAL. Wire the AC feed through the ferrite
bead (provided). Refer to Figure 2-18.
3. Before applying AC power to the system, connect the
batteries per the instructions on the following page, and
replace the protective cover removed in step 1.
4. Connect Safety Ground from electrical service to
mounting stud (see Figure 2-18) marked with Earth
symbol. Use a terminal lug that is suitable for the
ground wire and nut used.
5. Replace protective cover.
Figure 2-15 AC Wiring
TB1
DANGER
HIGH VOLTAGE
IN THIS AREA
DACT TELEPHONE
CONNECTIONS
EXPANSION POWER SUPPLY ASSY.
NAC MODULE
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
TB2
1 2 3 4 5 6 7 8
TB3
1 2 3 4 5 6 7 8 9 10
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
MAIN SYSTEM BOARD - CONVENTIONAL (MSB - C)
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