MS-5UD & MS-10UD Series Manual — P/N 52626:C2 1/24/2012 153
Appendix D: 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 cir-
cuit. 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 42 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
)
Remote Sync
Output
Provides strobe
and normal sync
for remote NAC
power supplies
Untwisted, unshielded pair
wire
Distance set by 295
ohm resistance
limitation
12-18 AWG (3.25 - 0.75 mm
2
)
NAC Outputs Connects to NAC
devices or Release
devices
Untwisted, unshielded pair
wire
Refer to Section D.1 and Section D.2 on page 154.
Table D.1 FACP Wire Specifications
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