Fire-Lite MRP-2002C Agent Release Control Panel - Manual (Page 168)

168 MRP-2002 Series Instruction Manual — P/N 53049:E2 3/7/2013
Appendix F: Wire Requirements
Connecting external system accessories to the main circuits must be carefully considered to ensure
proper operation. It is important to use the correct type of wire, gauge and run length for each
circuit. Reference the chart below to specify wire requirements and limitations for each circuit.
CIRCUIT CONNECTIONS WIRE REQUIREMENTS
Circuit Type Circuit Function Wire Type and Limitations
Recommended
Max. Distance
Feet (meters)
Wire Gauge
Initiating Device
Circuit
(power-limited) Connects to
Initiating Devices Untwisted, unshielded wire
(maximum loop resistance
not to exceed 100 ohms) Distance limitation
set by 100 ohm
resistance limitation 12-18 AWG (3.25 - 0.75 mm 2 )
ANN-BUS (EIA-485)
power-limited Communication for
ANN-BUS
annunciator and
relay modules Twisted pair a maximum
loop resistance of 120 ohms 6,000 (1,800 m) 12-18 AWG (3.25 - 0.75 mm 2 )
ANN-BUS Power Power for
ANN-BUS
annunciators
Refer to Table 2.1, “Wiring Distances,” on page 36 for information on device wiring.
24 VDC Regulated,
resettable,
nonresettable Power for
accessories and
4-wire devices Untwisted, unshielded wire Distance limitation
set by 4 volt
maximum line drop 12-18 AWG (3.25 - 0.75 mm 2 )
Auxiliary Trouble
Input Open Collector
trouble input for
CHG-75,
CHG-120F, etc. Single conductor Distance limitation
20 feet in same
room 18 AWG (0.75 mm 2 )
NAC/Solenoid
Outputs Connects to NAC
devices or Release
devices Untwisted, unshielded pair
wire Refer to Section F.1 on page 169.
Table F.1 FACP Wire Specifications