90 6820 / 6820EVS Manual P/N LS10144-001SK-E:C 09/28/2017
• SK SWIFT Wireless Devices–A SWIFT Gateway system supports up to 50 devices: 1 SWIFT Gateway and up to 49 (in any
combination) wireless detectors and monitor modules. Multiple Gateways can be used. See the SWIFT manual P/N LS10036-
001SK-E for more information.
7.5 Wiring Requirements for SLC Devices
The following information applies to all SLC devices. Refer to the section that describes the type of device you are installing for details.
7.5.1 Wire Sizing on 5815XL for SD Devices
The wire can be untwisted, unshielded, solid or stranded as long as it meets the National Electric Code 760-51 requirements for power
limited fire protective signaling cables. Wire distances are computed using copper wire.
Maximum wiring resistance is 50 ohms for SD devices.
Maximum loop length depends on the wire gauge. See Table 7.3 for SD devices.
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
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.
Wire Gauge Max. Distance for SD
22 AWG 1500 feet
18 AWG 3900 feet
16 AWG 6200 feet
14 AWG 10,000 feet
Table 7.3 Maximum wiring distance for SD devices
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.
Table 7.4 SLC Wiring Requirements for SK modules
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