Date
9/7/2018
File
BSR-2114/MAR
Document Number
921211401_09_002
Page
31 από 74
31
1 x N
heat of rise detector
+
1 x N
call point
+
4 x N
line isolators
+
10 x N
Conventional devices drivers
+
1 x N
Input units
+
1 x N
Input/output units
0 x N
indication LED
= 1*85 + 1*20
+ 1*20 + 4*6 + 10*0 + 1*2+ 1*16
+0*10= 167mA
Where «Ν» is the number of devices i.e. N
smoke detectors
is the number of smoke detectors in the installation.
In an alarm condition we must also calculate the additional current of the activated devices. Let’s presume that 4
detectors, 2 input/output units and 2 indication LEDs are activated then the additional current is:
I
additional current
= (1,5-1)*4 + (6-1)*2 +5*2 = 22 mA
The total current is :
I
Total
= I
quiescent
+ I
Additional current
= 167mA +22mA = 189mA
Since the installation has a cable length of 1200m and considering the table above we can see that the cable cross section for
this current must be 1,5mm.
Be advised that if the installation is done in an industrial area or if the cables pass near frequency generating
equipment such a motors, generators, ballasts, e.t.c then a shielded cable must be used.
3.6
Cabling
The panel has cable knock outs that are located on the top and bottom sides of the casing. (see figure 3.4).
Do not remove the grommets in order to not change the protection class (IP30) of the cover. (required by regulations EN 54-2).
Each connection should have it’s own cable, for example, for connecting the loop or the siren use a 2 core cable whereas the
connection with the main power supply use 3 core cable.
All shielding form the cables and all ground must be connected to the electrical connection terminal block found at the left
side of the panel.
The connection cables must be suitable for fire detection installations such as FIP200, MICC, PYROFIL.
The cables that are used for transmitting data must be of the twisted pair type and must have insulation.
The terminal blocks of the panel can accept cables with a cross section of up-to 2,5mm. The terminals should be tightened
even if no connection is done with them.
The cable cross section for conventional sirens is shown in the table below.
Table 3-3 Siren cable length (Alarm)
Cable
length(m)
Alarm
current
(mA)
200m
500m
1000m
1500m
2000m
100mA
1.0 mm
2
1.0 mm
2
2.0 mm
2
2.5 mm
2
2.5 mm
2
250mA
1.0 mm
2
1.5 mm
2
2.5 mm
2
2.5 mm
2
2.5 mm
2
500mA
1.5 mm
2
1.5 mm
2
2.5 mm
2
2.5 mm
2
2.5 mm
2
The central power supply of the panel must be connected to the mains power supply using a fuse with a rating of 16Amp. This
fuse should be labeled
«Fire Detection System – Do not isolate»
.
The central power supply must have a ground cable that is connected to the central grounding of the building.
