Fire-Lite MRP-2001C PRE-ACTION/DELUGE CONTROL PANEL - Manual (Page 136)

136 MRP-2001 Series Manual — P/N 53040:D 12/15/2010
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 “ANN-BUS Devices” on page 33 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 137.
Table F.1 FACP Wire Specifications