Loop Connections - INIM PREVIDIA COMPACT Installation Manual

3.6

Loop connections

The connection circuits of the peripheral detection/activation devices are defined as "loops". These loops start from the
output terminals, run through the entire protected area connecting in parallel all the system devices before re-entering
on the input terminals.
The loop utilizes the same two wires for the power supply to devices and for two-way communication. Due to electrical
incompatibility, devices with different protocols cannot be connected on the same loop The type of protocol can be set
independently for each loop, in such a way as to integrate on the same control panel loop devices of different brands.
Loops are made by means of a two-wire shielded cable with proper wire section (refer to the following cable
specifications) and in compliance with local laws in force.
The wiring must be completed in a loop in order to guarantee the tolerance of wire-cutting or short-circuit on the cable.
If you are making a two-wire connection, you can install a maximum of 32 fire-alarm devices on the loop (detectors or
call points).
Cables:
2 wire shielded cable
Twisted 5/10cm
Total maximum capacity 0.5uF
Maximum length 2000m
Maximum resistance (considering the sum of the positive
and negative conductor) 40Ohm
For a maximum estimate refer to the table below:
The cable shield must be connected to the earth terminal "
For the connections of the various devices refer to the instructions supplied with the devices themselves.
The following diagram illustrates the proper completion of the loop wiring. Starting from the "Lx O" ([A]) terminals
proceed with the connection of the peripheral devices located in the area protected by the system ([B]) and re-enter on
terminals "Lx I" ([C]).
A
D
When connecting the loop devices it is not necessary to follow the input/output order indicated in the figure.
Connect the cable shield only to the start-end of the loop ([D], the shield can be connected to the "
careful to splice appropriately shields that have been cut for device connections ([E]).
24
X
C
Total loop
length
Up to 1000m
Up to 1500m
Up to 2000m
" at one end only.
B
E
Fire detection and extinguishant system
Wire
section
2 x 1 mm²
2 x 1.5 mm²
2 x 2 mm²
B
E
" terminal. Be
American
Wire
Gauge
17 AWG
16 AWG
14 AWG
Installation