If notification appliances on a given circuit are to be used for multiple notification zones for partial evacuation (selective signaling), then either
a Class A loop circuit configuration and isolators must be used, with isolators bounding any wire segment that services a notification zone; or,
the NAC riser must be installed in accordance with Survivability From Attack by Fire Requirements in NFPA 2002 ED. Section 6.9.4, using one or
more of the following:
• 2 hour rated cable assembly
• a 2 hour rated shaft or enclosure
• 2 hour rated stairwell in building fully sprinklered in accordance with NFPA 13
The table below shows the maximum SLC wire length based on wire type and supervision communications.
Table 5: Maximum SLC Wire Length to Farthest Appliance Based on Supervision Communications
Distance in Feet (Meters) to the Last Appliance
Unit Load Range 18 AWG (0.82 mm²) 14 AWG (2.08 mm²) 12 AWG (3.31 mm²)
1 to 3 305 ft (93 m) 772 ft (235 m) 1,228 ft (374 m)
4 to 7 260 ft (79 m) 657 ft (200 m) 1,046 ft (319 m)
8 to 13 213 ft (65 m) 538 ft (164 m) 856 ft (261 m)
14 to 20 175 ft (53 m) 444 ft (135 m) 706 ft (215 m)
21 to 30 140 ft (43 m) 355 ft (108 m) 565 ft (172 m)
31 to 40 117 ft (36 m) 296 ft (90 m) 471 ft (144 m)
41 to 50 100 ft (30 m) 254 ft (77 m) 403 ft (123 m)
51 to 60 ― 222 ft (68 m) 353 ft (108 m)
61 to 75 ― 187 ft (57 m) 297 ft (91 m)
page 12 579-336 Rev. M
4100-5120, 4100-5121, 4100-5122 TrueAlert Power Supply Installation Instructions
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