24 Remote Booster Power Supply Technical Reference Manual
NAC Class B wiring
Connect a single NAC circuit to one NAC output. Terminate the circuit with a
15 k EOL resistor.
Figure 13: NAC class B wiring
+
++
+++
TB2
TB1
TB5
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(18)
(19)
(20)
(21)
Legend
(1) NAC1
(2) NAC2
(3) NAC3
(4) NAC4
(5) 200 mA AUX Continuous
(6) Sense 1 IN
(7) Sense 1 COM
(8) Sense 1 OUT
(9) Sense 2 IN
(10) Sense 2 COM
(11) Sense 2 OUT
(12) Trouble NO
Notes
(13) Trouble COM
(14) Trouble NC
(15) Notification appliance circuit (NAC),
typical of up to four NACs
(16) Input from signaling circuit. This is a
control circuit. NACs are not permitted.
(17) To next booster, or NAC end-of-line
resistor
(18) EOL
(19) EOL (UL listed 15 k for NAC)
(20) Control circuit source
(21) AC power fail monitoring
• A trouble on the booster power supply is sensed on the circuit that connects to the BPS
sense input. This removes the need to separately monitor the trouble contact except for AC
power failure.
• In an alarm condition, the booster power supply allows NAC current to move downstream to
devices connected to the existing control panel’s NAC circuit.
• Refer to the connected control module or control unit’s documentation for more details on
control circuit wiring.
• The AC power failure panel connection annunciates at the panel but does not report off
premises for a predetermined time in U.S. fire applications. See Table 8 on page 19.
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