• All wiring is supervised and power limited.
• All wiring to be twisted pair – minimum 18 AWG (0.82 mm²), maximum 12 AWG (3.31 mm²). If shielded pair is used, the cable shield drain wire
from all connected branches and taps must attach back to the (--) terminal of the circuit. Maximum two wires per terminal position.
• Maximum alarm current is 3 A per SLC. Use alarm current for lowest rated appliance nameplate voltage. Total alarm current for all three SLCs
plus all current draw from AUX power and option cards must not exceed 9 A.
• Supervisory current is 0.20 mA per unit load.
• Maximum length of all wire segments added together is 10,000 feet (3,048 m) per SLC. Maximum wire length from panel to any device is 2,500
feet (762 m).
• The maximum wiring capacitance is 0.6 uF per channel. If shielded wire is used, you must add the capacitance of the drain wire to the
conductor.
• Voltage rating is 24 VDC, 2 V, peak-to-peak ripple maximum.
• Maximum of six isolators between any appliance and SLC terminals. Maximum 12 isolators per SLC. Maximum 30 devices connected directly to
any isolator terminal pair.
• If notification appliances on a given Class B circuit are to be used for multiple notification zones for partial evacuation (selective signaling), then
the NAC riser must be installed in accordance with the Survivability From Attack by Fire Requirements in NFPA 2002 ED. Section 6.9.4. One or
more of the following should be used:
- 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 wire branch lengths for various alarm loads.
Table 6: Maximum SLC Wire Branch Length Based on Appliance Current Load
Distance in Feet (Meters) to the Last Appliance
Alarm Current 18 AWG (0.82 mm²) 14 AWG (2.08 mm²) 12 AWG (3.31 mm²)
0.11 A 1,058 ft (322 m) 2,500 ft (762 m) 2,500 ft (762 m)
0.25 A 471 ft (144 m) 1,328 ft (405 m) 2,169 ft (661 m)
0.50 A 241 ft (73 m) 669 ft (204 m) 1,089 ft (332 m)
0.75 A 164 ft (50 m) 450 ft (137 m) 730 ft (223 m)
1.00 A 125 ft (38 m) 340 ft (104 m) 550 ft (168 m)
1.25 A 102 ft (31 m) 274 ft (84 m) 442 ft (135 m)
1.50 A 87 ft (27 m) 230 ft (70 m) 370 ft (113 m)
2.00 A ― 175 ft (53 m) 280 ft (85 m)
2.50 A ― 142 ft (43 m) 226 ft (69 m)
Wire Distances Based on 2.0 V Line Drop
The table below shows the maximum SLC wire branch length based on supervision communications.
Table 7: Maximum SLC Wire Branch Length 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)
1 658 ft (201 m) 1,681 ft (512 m) 2,500 ft (762 m)
2 to 3 602 ft (183 m) 1,536 ft (468 m) 2,500 ft (762 m)
4 to 7 514 ft (157 m) 1,310 ft (399 m) 2,086 ft (636 m)
8 to 13 422 ft (129 m) 1,073 ft (327 m) 1,709 ft (521 m)
14 to 20 350 ft (107 m) 887 ft (270 m) 1,411 ft (430 m)
21 to 30 282 ft (86 m) 712 ft (217 m) 1,131 ft (345 m)
31 to 40 237 ft (72 m) 595 ft (181 m) 944 ft (288 m)
41 to 50 204 ft (62 m) 511 ft (156 m) 811 ft (247 m)
51 to 60 180 ft (55 m) 449 ft (137 m) 711 ft (217 m)
61 to 75 153 ft (47 m) 379 ft (116 m) 600 ft (183 m)
page 14 579-336 Rev. M
4100-5120, 4100-5121, 4100-5122 TrueAlert Power Supply Installation Instructions
To Next Page
Loading...
Need help?
General
