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Two-Wire SLC - Style 4 (Class B)
FACP:
Wire Type and Limitations
Twisted-shielded pair. 40 ohms maximum per
length of Style 6 and 7 loops. 40 ohms per
branch maximum for Style 4 loops.
Untwisted, unshielded wire, in conduit or
outside of conduit.
Note: Twisted-unshielded pair wire is not recommended for use with this panel.
Note: Maximum total capacitance of all SLC wiring (both between conductors and from any conductor to earth) should not exceed 0.5
microfarads.
Twisted-shielded pair, 12 to 18 AWG. 40
ohms, maximum per length of Style 6 and 7
loops. 40 ohms per branch maximum for Style
4 loops.
Untwisted, unshielded wire, in conduit or
outside of conduit.
Note: Twisted-unshielded pair wire is not recommended for use with this panel.
Twisted-shielded pair. Maximum loop
resistance is 40 ohms. Maximum length is
10,000 ft. per channel (NFPA Style 4) or
10,000 ft. total twisted pair length (NFPA Style
6 and 7). Maximum loop current is 200 mA
(short circuit) or 100 mA (normal).
Twisted-shielded pair. Maximum loop
resistance: 40 ohms.
Maximum loop voltage: 27.6 VDC. Maximum
loop current: 200 mA (short circuit) or 100 mA
(normal operation).
Table 2.2 Wiring: AFP-100, AFP-200, AFP-300/400, LIB-200, AIM-200 (2 of 2)
2.2 Two-Wire SLC - Style 4 (Class B)
2.2.1 Measuring Loop Resistance
T-tapping of the SLC wiring is permitted for two-wire Style 4 configurations. The total DC resistance from the control panel to each
branch end cannot exceed:
•
50 ohms for NFS-320, NFS2-640, NFS-640, LCM-320, LEM-320, LIB-200A, and LIB-400.
•
40 ohms for AFP-100, AFP-200, AFP-300/400, LIB-200, and AIM-200.
Measure DC resistance as detailed and shown below:
1.
With power removed, short the termination point of one branch at a time and measure the DC resistance from the beginning of the
SLC to the end of that particular branch.
2.
Repeat this procedure for all remaining branches in the SLC.
In Figure 2.1, Branches A, B, and C all begin at the SLC terminal, even though Branch B is T-tapped.
Notifier SLC Wiring Manual — P/N 51253:U5 12/20/2017
Recommended
Max. Distance
10,000 ft. (3,048 m)
8,000 ft. (2,438.4 m)
4,875 ft. (1,485.9 m)
3,225 ft. (982.98 m)
1,000 ft. (304.8 m)
AFP-300/AFP-400
10,000 ft. (3,048 m)
8,000 ft. (2,438.4 m)
4,875 ft. (1,485.9 m)
3,225 ft. (982.98 m)
1,000 ft. (304.8 m)
LIB-200 on AM2020/AFP1010 (See Table 2.1 for LIB-200A or LIB-400.)
10,000 ft. (3,048 m)
8,000 ft. (2,438.4 m)
4,875 ft. (1,485.9 m)
3,225 ft. (982.98 m)
If the wiring connected to the LIB-200 leaves the building it must be in conduit. It can not exceed
1000 m (1093 yards), must not cross any power lines, and must not be in the vicinity of any high
voltage. These outdoor wiring restrictions do not apply to the LIB-200A or the LIB-400.
System 5000 with AIM-200
10,000 ft. (3,048 m)
8,000 ft. (2,438.4 m)
4,875 ft. (1,485.9 m)
3,225 ft. (982.98 m)
AFP-200
12 AWG (3.31 mm²)
14 AWG (2.08 mm²)
16 AWG (1.31 mm²)
18 AWG (0.82 mm²)
12 to 18 AWG (3.31 mm² to 0.82 mm²)
12 AWG (3.31 mm²)
14 AWG (2.08 mm²)
16 AWG (1.31 mm²)
18 AWG (0.82 mm²)
12 to 18 AWG (3.31 mm² to 0.82 mm²)
12 AWG (3.31 mm²)
14 AWG (2.08 mm²)
16 AWG (1.31 mm²)
18 AWG (0.82 mm²)
12 AWG (3.31 mm²)
14 AWG (2.08 mm²)
16 AWG (1.31 mm²)
18 AWG (0.82 mm²)
Wiring Requirements
Wire Gauge
17
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