14
796688 (4188-657)_ I1.2 / 02.02
External circuits
Loop circuit
The loop circuit of a system 800 can accommodate 127
devices, such as conventional detectors fitted to
addressable bases, manual call points, zonal indicator
units and sounder control transponders.
Data:
Loop length 1Km
Equipment Quiescent current
Ionisation smoke 30µA
Optical smoke 60µA
Heat 20µA
Rate of Rise 20µA
Detector base 50µA
Manual Call Point 45µA
Control panel 50mA
Loop earth continuity
The cable earth (screen) must
be continued through each
device on the loop circuit and
to a panel earth point on the
gland plate.
Loop
Circuit
CONTROL
PANEL
L1
0V
Earth continuity
L2
0V
Single
Input
or
Output
Loop end 1 Loop end 2
Electronic
Module
Control panel
LOOP
L1 L20V 0V
P20
12V
Sounder Control
Transponder
Zonal
repeat
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