Chapter 1: Product design
SIGA-REL Technical Reference Manual
11
Abort circuit, TB3-3 and TB3-4
Line resistance
End of line device
Circuit capacitance
Supervision
Ground fault impedance
25
/wire, 18 AWG = 3,800 ft (0.75 sq mm = 1,158 m)
47 k
resistor
0.1
F, max.
Open and ground
0.0 Ω
Zone relay output, TB2
UL rating
Type
Contact rating:
Supervision
Zone
Form C
3 A at 24 VDC, (resistive load)
Not supervised
Signature data line, TB1
Operating voltage
Supervisory current
Alarm current
Line resistance
Maximum quantity
15.2 to 19.95 VDC
1 mA
1 mA
See the installation sheet for the Signature loop controller
10 SIGA-REL modules per loop
Operating environment
Temperature
Relative humidity
32 to 120°F (0 to 49°C)
0 to 93% noncondensing
[1] Riser current: The total current of the prerelease and release circuits is limited to 3.83 A. This
is the power riser maximum input current of 4 A, minus 170 mA.
Table 7: Power riser
Total riser
current (A)
Distance from SIGA-REL to power supply
Wire
resistance
[1]
12 AWG
2.5 sq mm
14 AWG
1.5 sq mm
4.0
29 ft
8.84 m
20 ft
6.10 m
0.050
3.5
34 ft
10.36 m
23 ft
7.01 m
0.057
3.0
39 ft
11.89 m
27 ft
8.23 m
0.067
2.5
47 ft
14.33 m
32 ft
9.75 m
0.080
2.0
59 ft
17.98 m
40 ft
12.19 m
0.100
1.5
78 ft
23.77 m
53 ft
16.15 m
0.133
1.0
118 ft
35.97 m
80 ft
24.38 m
0.200
[1] Wire resistance measured
in Ω per wire
Table 8: Prerelease and release circuits (per circuit)
Total riser
current (A)
Distance from SIGA-REL to signals
Wire
resistance
[1]
12 AWG
2.5 sq mm
14 AWG
1.5 sq mm
2.00
176 ft
53.64 m
120 ft
36.58 m
0.300
1.75
202 ft
61.57 m
137 ft
41.76 m
0.343
1.50
235 ft
71.63 m
160 ft
48.77 m
0.400
