LS10144-001SK-E
SK, SD and SWIFT™ Wireless SLC Device Installation
7-4
7.5.2
Wire Sizing for 6815
The SLC requires use of a specific wire type, depending on mode of operation, to ensure proper circuit
functioning. Wire size should be no smaller than 18 AWG and no larger that 12 AWG wire. The wire size
depends on the length of the SLC circuit. It is recommended that all wiring be twisted-pair to minimize the
effects of electrical interference.
Table 7-3: Maximum wiring distance for SD devices
Wire Gauge
Max. Distance for SD
22 AWG
1500 feet
18 AWG
3900 feet
16 AWG
6200 feet
14 AWG
10,000 feet
7.5.3
SK Modules
The 6820 or 6820EVS SLC can be programmed to operate in SK mode. While shielded wire is not required, it is
recommended that all SLC wiring be twisted-pair to minimize the effects of electrical interference. Use Table 7-
4 to determine the specific wiring requirements for the SLC.
Table 7-4 SLC Wiring Requirements for SK modules
Wire Requirements
Distance in Feet (meters)
Wire Type
RECOMMENDED
: Twisted-unshielded pair,
12 to 18 AWG (3.31mm to 0.82 MM). 50
ohms, maximum per length of Style 6 & 7. 50
ohms per branch maximum for Style 4 loop.
12,500 ft. (3,810 m)
9,500 ft. (2895.6 m)
6,000 ft. (1,828.8 m)
3,700 ft. (1,127.76 m)
12 AWG (3.31 mm)
14 AWG (2.08 mm)
16 AWG (1.31 mm)
18 AWG (0.82 mm)
Untwisted, unshielded wire, in conduit or
outside of conduit.
5,000 ft. (1,528 m)
3,700 ft. (,127.76 m)
12 to 16 AWG (3.31 mm to 1.31 mm)
18 AWG (0.82 mm)
Twisted, shielded pair
Note:
• Shields must be isolated from ground
• Shields should be broken at each device
5,000 ft. (1524 m)
3,700 ft. (1,127.76 m)
12 to 16 AWG (3.31 mm to 1.31 mm)
18 AWG (0.82 mm)
Note:
Maximum total capacitance of all SLC wiring (both between conductors and from any conductor to ground)
should not exceed 0.5 micro farads.