Specifications

Cable Specifications
Installation Handbook, Autroprime Interactive Fire Detection System, 116-P-APRIME-INSTALL/DGB Rev. E, 2011-08-16,
Autronica Fire and Security AS
Page 18
A 25% margin should be added for safety, to ensure correct operation
in case of excessive current consumption, degraded connections
(ageing), etc.
8.2.2 Guidance Table
The table below provides examples showing different legal
combinations of cable dimension, loop length, the number of
detectors/sounders and the maximum loop current for a selected
detection loop.
100mA
used where maximum current < 75 mA and cable resistance <50Ω
150mA
used where maximum current < 110mA and cable resistance <31Ω
200mA
used where maximum current <150 mA and cable resistance <20Ω
250mA
used where maximum current < 185 mA and cable resistance <13Ω
Examples
Cable
dimension
Typical
Loop length
*1)
Typical
numbers/combinations
of Detectors/
Sounders
Loop
Driver
Current
Mode
0,75mm2 100m 20/0
100mA
0,75mm2 100m 20/20
150mA
0,75mm2 200m 40/0
100mA
0,75mm2 200m 40/40
250mA
0,75mm2 500m 100/0
100mA
0,75mm2 1000m 127/0
100mA
1mm2 100m 20/0
100mA
1mm2 100m 20/20
150mA
1mm2 200m 40/0
100mA
1mm2 200m 40/40
250mA
1mm2 500m 100/0
100mA
1mm2 500m 70/30
200mA
1mm2 1000m 127/0
100mA
1,5mm2 100m 20/0
100mA
1,5mm2 100m 20/20
150mA
1,5mm2 200m 40/0
100mA
1,5mm2 200m 40/40
250mA
1,5mm2 500m 100/0
100mA
1,5mm2 500m 80/35
250mA
1,5mm2 1000m 127/0
100mA
2,5mm2 100m 20/0
100mA
2,5mm2 100m 20/20
150mA
2,5mm2 200m 40/0
100mA
2,5mm2 200m 40/40
250mA
2,5mm2 500m 100/0
100mA
2,5mm2 500m 80/35
250mA
2,5mm2 1000m 127/0
100mA
2,5mm2 1000m 70/30
200mA
*1) Loop length is the total distance of the 2-wire from output and back
to input.
Note:
A 25% margin should
be added for safety