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Johnson Controls, Inc. SLC Wiring Manual —
P/N 51870:G 04/23/2009
Wiring Requirements
Two-Wire SLC - Style 4 (Class B)
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 exceed50 ohms.
•
50 ohms for IFC-320, IFC2-640, IFC-640, LCM-320, LEM-320, JLIB-200A and JLIB-400.
•
40 ohms for IFC-200, IFC-300/400, and JLIB-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.
*
XPIQ-SLI is an SLC device that provides an additional local SLC loop. This local SLC loop should use the same type of
wire recommended for the FACP controlling the main SLC loop. Maximum resistance of the local SLC (from any device
to FACP): 50 ohms. Maximum resistance of the local SLC (from any device to XPIQ-SLI): 20 ohms. (Maximum number
of detectors and modules = 64) Maximum SLC local branch current degraded mode: 20 mA. Maximum distance of local
loop: 2,000 ft. (600 m). Recommended wire: 12 AWG (3.31 mm²)
†
Notifier brand cable is recommended; see the product catalog available from Paige Electric.
FACP:
Wire Type and Limitations
Recommended
Max. Distance
Wire Gauge
IFC-200
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 ft. (3,048 m)
8,000 ft. (2,438.4 m)
4,875 ft. (1,485.9 m)
3,225 ft. (982.98 m)
12 AWG (3.31 mm²)
14 AWG (2.08 mm²)
16 AWG (1.31 mm²)
18 AWG (0.82 mm²)
Untwisted, unshielded wire, in conduit
or outside of conduit
1,000 ft. (304.8 m)
12 to 18 AWG (3.31 mm² to 0.82 mm²)
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.
IFC-300/IFC-400
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.
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)
12 AWG (3.31 mm²)
14 AWG (2.08 mm²)
16 AWG (1.31 mm²)
18 AWG (0.82 mm²)
Untwisted, unshielded wire, in conduit
or outside of conduit.
1,000 ft. (304.8 m)
12 to 18 AWG (3.31 mm² to 0.82 mm²)
Note:
Twisted-unshielded pair wire is not recommended for use with this panel.
JLIB-200 on IFC-1010/IFC-2020 (See Table 2.1 for JLIB-200A or JLIB-400.)
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).
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)
12 AWG (3.31 mm²)
14 AWG (2.08 mm²)
16 AWG (1.31 mm²)
18 AWG (0.82 mm²)
*If the wiring connected to the JLIB-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 JLIB-
200A or the JLIB-400.
Table 2.2 Wiring: IFC-200, IFC-300/400, JLIB-200
