Wiring Tables And Information; Four-Wire Smoke Power (Regulated); Table 3 Initiating Circuit Wiring Distances; Table 4 Indicating Circuit Wiring Distances - Mircom FR-320 Series Installation And Operation Manual

7.8

Wiring Tables and Information

Table 3 Initiating Circuit Wiring Distances

WIRE GAUGE
AWG
22
20
18
16
14
12
i
Notes: For Class A the maximum wiring run to the last device is divided by two.

Table 4 Indicating Circuit Wiring Distances

TOTAL MAXIMUM WIRING RUN TO LAST DEVICE (ELR)
SIGNAL
18AWG
LOAD
Amperes ft
0.06 2350
0.12 1180
0.30 470
0.60 235
0.90 156
1.20 118
1.50 94
1.70 78
i
Notes: For Class A wiring the resistance in ohms is multiplied by two.
7.9

Four-Wire Smoke Power (regulated)

Four-wire smoke power is provided for four-wire smoke detectors. This filtered supply is
supervised therefore a short will disconnect the power and the common trouble is active. The
power is reconnected after the 'RESET' key is pressed. See 17.0 Appendix E:
Specifications on page 101 for supply rating.
MAXIMUM WIRING RUN TO LAST DEVICE
FEET
2990
4760
7560
12000
19000
30400
Maximum loop resistance should not exceed 100 ohms.
Maximum capacitance of 0.5uF total on each initiating circuit.
16AWG
m ft m
716 3750 1143
360 1850 567
143 750 229
71 375 114
47 250 76
36 185 56
29 150 46
24 125 38
Maximum voltage drop should not exceed 1.8 volts.
METERS
910
1450
2300
3600
5800
9200
14AWG 12AWG
ft m ft
6000 1829 9500 2895
3000 915 4720 1438
1200 366 1900
600 183 950
400 122 630
300 91 470
240 73 380
200 61 315
Field Wiring
MAX. LOOP
RESISTANCE
m Ohms
30
15
579 6
289 3
192 2
143 1.5
115 1.2
96 1.0
35