PDRP-2001 Datasheet, PDF (31/140 Pages) Systemsensor advanced ideas. – Deluge Preaction Control Panel

ANN-BUS Devices
Installation
After calculating the total worst case current draw, Table 2.1 specifies the maximum distance
the modules can be located from the FACP on a single wire run. The table ensures 6.0 volts of
line drop maximum. In general, the wire length is limited by resistance, but for heavier wire
gauges, capacitance is the limiting factor.
These cases are marked in the chart with an asterisk (*). Maximum length can never be more
than 6,000 feet (1,800 m), regardless of gauge used. The formula used to generate this chart is
shown in the note below.
Total Worst Case Current
Draw (amps)
0.100
0.200
0.300
0.400
0.500
Wiring Distance: ANN-BUS Modules to FACP
22 Gauge
18 Gauge
16 Gauge
1,852 ft.
4,688 ft.
* 6,000 ft.
926 ft.
2,344 ft.
3,731 ft.
617 ft.
1,563 ft.
2,488 ft.
463 ft.
1,172 ft.
1,866 ft.
370 ft.
938 ft.
1,493 ft.
Table 2.1 Wiring Distances
14 Gauge
*6,000 ft.
5,906 ft.
3,937 ft.
2,953 ft.
2,362 ft.
Note: The following formulas were used to generate the wire distance chart:
Maximum Resistance (Ohms)
=
6.0 Volts
Total Worst Case Current Draw (amps)
Maximum Wire Length (feet)
=
(6,000 feet maximum)
Maximum Resistance (Ohms)
Rpu
where: Rpu = Ohms per 1,000 feet for various Wire Gauges (see table below)
*500
Wire Gauge
22
18
16
14
Ohms per 1,000 feet (Rpu)
16.2
6.4
4.02
2.54
Exception: When using the ANN-RLY module, the installer must ensure that the maximum
24VDC power line drop does not exceed 0.3 volts. This results in the following wiring
limitations:
Wire Gauge
18
16
14
12
Maximum Wire Length
312 feet
497 feet
787 feet
1,250 feet
PDRP-2001 Series PN 53043:A 5/08/2007
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