Date
9/7/2018
File
BSR-2114/MAR
Document Number
921211401_09_002
Page
30 από 74
30
Table 3-2 Loop cable length
Cable
Length (m)
Quiescent
Current (mA)
200m
500m
1000m
1500m
2000m
50mA
0.5 mm
2
0.5 mm
2
0.75 mm
2
1 mm
2
2.5 mm
2
100mA
0.5 mm
2
0.5 mm
2
0.75 mm
2
1 mm
2
2.5 mm
2
150mA
0.5 mm
2
0.5 mm
2
1 mm
2
1.5 mm
2
2.5 mm
2
200mA
0.5 mm
2
0.5 mm
2
1,5 mm
2
1.5 mm
2
2.5 mm
2
Figure 3-17 Calculating loop consumption with a PC.
In order to fully understand this we will explain it with an example.
In a 70 room hotel we will use a BSR-2100 panel. Each room has a smoke detector and every three rooms there is a manual
call point and finally there is a line isolator on every floor. The total cable length of the installation is 1200 meters. Also the
system will be divided into 16 zones, thus we must use 16 input/output units.
The consumption of the installation during the normal operation in mA is:
I
quiescent
= 1 x N
smoke detectors
+
