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APPENDIX C
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T-tapping of the SLC loop wiring is allowed for 2-wire (Style 4) configurations. The total
resistance of any branch cannot exceed 40 ohms. The total wire length of all branches
cannot exceed 10,000 feet (3,000 m).
Connecting external system accessories to the Unimode 9600 main circuits must be
carefully considered to ensure proper operation. It is important to use the correct type of
wire, wire gauge and wire run length for each Unimode 9600 circuit. Reference the chart
below to specify wire requirements and limitations for each Unimode 9600 circuit.
Note: If the SLC loop is to be run in conduit with Notification Appliance Circuits, the risk
of encountering problems can be greatly reduced by exclusively employing electronic
sounders (such as MA/SS-24D) instead of more electronically noisy notification
appliances such as electromechanical bells or horns.
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CIRCUIT CONNECTIONS WIRE REQUIREMENTS
Circuit Type Circuit Function Wire Type and Limitations
Recommended
Max. Distance
Feet (meters)
Wire Gauge and Compatible Brands
SLC loop
(power-limited)
Connects to
Addressable
Devices
Twisted, shielded pair, 40
ohms maximum per length
of Style 6 and 7 loops. 40
ohms per branch maximum
for Style 4 loops
1
10,000 (3,000 m)
8,000 (2,400 m)
4,875 (1,450 m)
3,225 (980 m)
12 AWG (3.25 mm
): Genesis 4410,
Signal 98230, Belden 9583, WPW999
14 AWG (2.00 mm
):Genesis 4408 & 4608
Signal 98430, Belden 9581, WPW995
16 AWG (1.30 mm
): Genesis 4406 & 4606
Signal 98630, Belden 9575, WPW991
Direct Burial Cable
Isotec NP713110VNQ-S
18 AWG (0.75 mm
): Genesis 4402 & 4602
Signal 98300, Belden 9574, WPW975
Direct Burial Cable
Isotec NP714110VNQ-S
Untwisted, unshielded pair 3,000 (900 m)
12-18 AWG (3.25 - 0.75 mm
)
ACS/TERM
(EIA-485)
(power-limited)
Connects to
annunciator
modules and
ADT-UDACT
Twisted, shielded pair with a
characteristic impedance of
120 ohms
6,000 (1,800 m)
18 AWG (0.75 mm
)
EIA-232
(power-limited)
connects to
remote printer
and PC computer
Twisted, shielded pair 50 (15 m)
18 AWG (0.75 mm
) minimum
MMF-300 and
MMF-301
(power-limited)
Initiating Device
Circuit
Maximum loop wire
resistance is 40 ohms for the
MMF-300 and 20 ohms for
the MMF-301
2,500 (760 m)
12-18 AWG (3.25 - 0.75 mm
)
MMF-302
(power-limited)
Initiating Device
Circuit
No more than a 2.4 volt drop
allowed at end of circuit.
Maximum loop wire
resistance is 25 ohms
2,500 (760 m)
12-18 AWG (3.25 - 0.75 mm
)
CMF-300
(power-limited)
Notification
Appliance
Circuit
In alarm, no more than a 1.2
volt drop allowed at end of
circuit
Distance limitation
set by 1.2 volt
maximum line
drop
12-18 AWG (3.25 - 0.75 mm
)
24 VDC
filtered
resettable
(power-limited)
Connects to
4-wire smoke
detectors
No more than 1.2 volt drop
allowed from supply source
to end of any branch
Distance limitation
set by 1.2 volt
maximum line
drop
12-18 AWG (3.25 - 0.75 mm
)
24 VDC
nonresettable
(power-limited)
Connects to
control modules,
annunciators and
accessories
No more than 1.2 volt drop
allowed from supply source
to end of any branch
Distance limitation
set by 1.2 volt
maximum line
drop
12-18 AWG (3.25 - 0.75 mm
)
CHG-120F Remote
secondary power
source
12 AWG (3.25 mm
) in
conduit
20 (6 m)
12-18 AWG (3.25 - 0.75 mm
)
Table Footnote
1. When using untwisted, unshielded wire, full conduit is recommended for optimum EMI/RFI protection.