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ELEFIRE
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AS AND
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IRE DETECTORS
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Rev 1.01 Date 4.2.2020
Page
2 of 7
Cable type
Maximum cable length (for a given size) as input
to:
Cable
(AWG)
Diameter
(mm)
Section
(mm
2
)
ADR-7000
,SAVER-7000 ,GUARD-7 ו ,
- ADR-3000
19
0.912
0.653
710
18
1.024
0.823
900
17
1.15
1.04
1,125
16
1.291
1.31
1,425
15
1.45
1.65
1,800
14
1.628
2.08
2,275
13
1.828
2.62
2,875
12
2.053
3.31
3,625
Table 1: selection of communication loop cables for addressable devices (SLC)
i
Note
IS 1220 part 3 (2014) states in section 12.1.4 that "When using cables that
are composed of two strands and up, the section area of each conductor in
the cable strand will be 0.5 mm
2
, as a minimum".
The cable lengths stated in table 1 are brought as an estimate, assuming the
cables are single-stranded.
In any case, the cable resistance, as measured in the field, has to be taken
into account.
In communication lines for addressable devices (SLC), the loop resistance
and capacitance
– the stricter of the two, has to be considered. The
capacitance of the SLC loop will not exceed 1
μF .
3.1.3
Wiring planning
– 24VDC supply
The assembly is fed by +24Vdc supply from the panel or local addressable power
supply, like TPS-74A or TPS-34A
. The resistance of the power supply line between the
power source 24Vdc and an addressable assembly will be calculated such that the
maximum voltage drop at the end of line, under full load, will not exceed 2V, or a
voltage level that supplies the last device with the minimum operating voltage,
according to the manufacturer's data
– the stricter of the two.
Use TPS-74A or TPS-34A
when the assembly is installed far from the panel, or when
the sum of consumer currents in regular operating mode or in alarm state exceeds the
maximum permissible current on the main power supply (the panel).