Wire Requirements
196 MS-9050UD PN 52413:C 01/23/08
APPENDIX E 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-9050UD 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-9050UD circuit. Reference the charts below to specify wire
requirements and limitations for each MS-9050UD circuit.
SLC Loop Using Twisted, Unshielded Wire
While shielded wire is not required, it is recommended that all SLC wiring be twisted-pair to
minimize the effects of electrical interference. Use the following table to determine the specific
wiring requirements for the SLC when various wire is used.
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 E.1 FACP 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, shielded pair
40 ohms maximum per
length of Style 6 and 7
loops. 40 ohms per branch
maximum for Style 4 loops
10,000 (3,000 m)
8,000 (2,400 m)
4,875 (1,450 m)
3,225 (980 m)
12 AWG (3.25 mm
2
): Genesis 4410,
Signal 98230, Belden 9583, WPW999
14 AWG (2.00 mm
2
):Genesis 4408 & 4608
Signal 98430, Belden 9581, WPW995
16 AWG (1.30 mm
2
): Genesis 4406 & 4606
Signal 98630, Belden 9575, WPW991
Direct Burial Cable
Isotec NP713110VNQ-S
18 AWG (0.75 mm
2
): Genesis 4402 & 4602
Signal 98300, Belden 9574, WPW975
Direct Burial Cable
Isotec NP714110VNQ-S
Twisted, unshielded pair
40 ohms maximum per
length of Style 6 and 7
loops. 40 ohms per branch
maximum for Style 4 loops
10,000 (3,000 m)
8,000 (2,400 m)
4,875 (1,450 m)
3,225 (980 m)
12 AWG (3.25 mm
2
): Belden 5020UL &
6020UL, Genesis WG-4315 & WG-4515
14 AWG (2.00 mm
2
):Belden 5120UL &
6120UL, Genesis WG-4313 & WG-4513
16 AWG (1.30 mm
2
): Belden 5220UL &
6220UL, Genesis WG-4311 & WG-4511
18 AWG (0.75 mm
2
): Belden 5320UL &
6320UL, Genesis WG-4306 & WG-4506
Untwisted, unshielded pair
1
3,000 (900 m)
12-18 AWG (3.25 - 0.75 mm
2
) using listed wire
ANN-BUS
(EIA-485)
(power-limited)
Connects to
annunciator
modules
Twisted pair with a
characteristic impedance of
120 ohms or less
6,000 (1,800 m) refer to "ANN-BUS Wiring" on page 20
EIA-232
(power-limited)
connects to 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
)
Table Footnote
1. When using untwisted, unshielded wire, full conduit is recommended for optimum EMI/RFI protection.
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