Wire Requirements Correlations
178 MS-9200UDLS PN 52750:A 11/04/05
APPENDIX D Wire Requirements
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 MS-9200UDLS 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 MS-9200UDLS circuit. Reference the
chart below to specify wire requirements and limitations for each MS-9200UDLS
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.
Table D.1 MS-9200UDLS Wire Specifications
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 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 (3.1 mm
2
): Genesis WG-4315,
WG-4515, Belden 5020UL, 6020UL
14 AWG (2.00 mm
2
):Genesis WG-4313,
WG-4513, Belden 5120UL, 6120UL
16 AWG (1.30 mm
2
): Genesis WG-4311,
WG-4511, Belden 5220UL, 6220UL
18 AWG (0.78 mm
2
): Genesis WG-4306,
WG-4506, Belden 5320UL, 6320UL
Untwisted, unshielded pair 3,000 (900 m)
12-18 AWG (3.25 - 0.75 mm
2
)
ACS/TERM
(EIA-485)
(power-limited)
Connects to
annunciator
modules
Twisted, shielded pair with a
characteristic impedance of
120 ohms
6,000 (1,800 m)
18 AWG (0.75 mm
2
)
EIA-232
(power-limited)
connects to
remote printer
and PC computer
Twisted, shielded pair 50 (15 m)
18 AWG (0.75 mm
2
) 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
2
)
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
2
)
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
2
)
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
2
)
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
2
)
CHG-120F or
CHG-75
Remote
secondary power
source
12 AWG (3.25 mm
2
) in
conduit
20 (6 m)
12-18 AWG (3.25 - 0.75 mm
2
)
Table Footnote
1. When using untwisted, unshielded wire, full conduit is recommended for optimum EMI/RFI protection.
