Johnson Controls, Inc. SLC Wiring Manual —
P/N 51870:G 04/23/2009
17
Section 2: Wiring Requirements
2.1 Recommended SLC Wiring
•
Twisted-unshielded pair is recommended for IFC-320, IFC2-640, IFC-640, IFC2-3030,
IFC-3030, LCM-320, LEM-320, JLIB-200A, and JLIB-400;
Maximum resistance is 50 ohms per branch. See Table 2.1.
•
Twisted-shielded pair: IFC-200, IFC-300/400, JLIB-200
Maximum resistance 40 ohms per branch. See Table 2.2.
To maximize distance on the SLC loop, use the recommended type of wire. Using other wiring
types makes the SLC circuit more susceptible to electrical interference and thus reduces its
maximum loop length.
FACP:
Wire Type and Limitations
*
Recommended
Max. Distance
Wire Gauge
†
JLIB-200A or JLIB-400 on IFC-1010/IFC-2020 (See Table 2.2 for JLIB-200.)
RECOMMENDED:
Twisted unshielded
pair, 12 to 18 AWG (3.31 mm² to 0.82
mm²†). 50 ohms max per length of
Style 6 and 7 loops. 50 ohms per
branch max for Style 4 loops
12,500 ft. (3,810 m)
9,500 ft. (2,895.6 m)
6,000 ft. (1,828.8 m)
3,700 ft. (1,127.76 m)
12 AWG/3.31 mm²
14 AWG/2.08 mm²
16 AWG/1.31 mm²
18 AWG/0.82 mm²
NOTE:
Twisted-shielded pair or untwisted unshielded wire is not recommended for use with JLIB-200A or JLIB-400.
IFC-640 and LEM-320 on IFC-640
RECOMMENDED:
Twisted-unshielded
pair, 12 to 18 AWG (3.31 mm² to 0.82
mm²). 50 ohms maximum per length of
Style 6 & 7 loops. 50 ohms per branch
maximum for Style 4 loop.
12,500 ft. (3,810 m)
9,500 ft. (2,895.6 m)
6,000 ft. (1,828.8 m)
3,700 ft. (1,127.76 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-shielded pair is not recommended for use with this panel.
Note:
Maximum total capacitance of all SLC wiring (both between conductors and from any conductor to ground) should not exceed 0.5
microfarads.
IFC-320, IFC2-640, LEM-320 on IFC2-640, LCM-320, LEM-320 on IFC-3030 or IFC2-3030
RECOMMENDED:
Twisted-unshielded
pair, 12 to 18 AWG (3.31 mm² to 0.82
mm²). 50 ohms, maximum per length of
Style 6 & 7 loops. 50 ohms per branch
maximum for Style 4 loop.
12,500 ft. (3,810 m)
9,500 ft. (2,895.6 m)
6,000 ft. (1,828.8 m)
3,700 ft. (1,127.76 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.
5,000 ft. (1,524 m)
3,700 ft. (1,127.76m)
12 to 16 AWG (3.31 mm² to 1.31 mm²)
18 AWG (0.82 mm²)
Twisted, shielded pair
Note:
• Shields must be isolated from ground.
• Shields should be broken at each device.
5,000 ft. (1,524 m)
3,700 ft. (1,127.76m)
12 to 16 AWG (3.31 mm² to 1.31 mm²)
18 AWG (0.82 mm²)
Note:
Maximum total capacitance of all SLC wiring (both between conductors and from any conductor to ground) should not
exceed 0.5 microfarads.
Table 2.1 Wiring Recommendations: IFC-320, IFC2-640, IFC-640, IFC2-3030, IFC-3030, JLIB-200A,
JLIB-400, LEM-320, and LCM-320
