Section 2: Wiring Requirements; Recommended Slc Wiring - Johnson Controls IFC-200 Wiring Manual

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
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
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.
Untwisted, unshielded wire, in conduit
or outside of conduit.
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.
Untwisted, unshielded wire, in conduit
or outside of conduit.
Twisted, shielded pair
Note:
• Shields must be isolated from ground.
• Shields should be broken at each device.
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,
Johnson Controls, Inc. SLC Wiring Manual — P/N 51870:G 04/23/2009
Recommended
Wire Gauge
Max. Distance
12,500 ft. (3,810 m) 12 AWG/3.31 mm²
9,500 ft. (2,895.6 m) 14 AWG/2.08 mm²
6,000 ft. (1,828.8 m) 16 AWG/1.31 mm²
3,700 ft. (1,127.76 m) 18 AWG/0.82 mm²
12,500 ft. (3,810 m) 12 AWG (3.31 mm²)
9,500 ft. (2,895.6 m) 14 AWG (2.08 mm²)
6,000 ft. (1,828.8 m) 16 AWG (1.31 mm²)
3,700 ft. (1,127.76 m) 18 AWG (0.82 mm²)
1,000 ft. (304.8 m) 12 to 18 AWG (3.31 mm² to 0.82 mm²)
12,500 ft. (3,810 m) 12 AWG (3.31 mm²)
9,500 ft. (2,895.6 m) 14 AWG (2.08 mm²)
6,000 ft. (1,828.8 m) 16 AWG (1.31 mm²)
3,700 ft. (1,127.76 m) 18 AWG (0.82 mm²)
5,000 ft. (1,524 m) 12 to 16 AWG (3.31 mm² to 1.31 mm²)
3,700 ft. (1,127.76m) 18 AWG (0.82 mm²)
5,000 ft. (1,524 m) 12 to 16 AWG (3.31 mm² to 1.31 mm²)
3,700 ft. (1,127.76m) 18 AWG (0.82 mm²)
JLIB-400, LEM-320, and LCM-320
†
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