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Optional Module Installation
In general, the wire length is limited by resistance, but for heavier wire gauges, capacitance is the limiting factor. Maximum length can never
be more than 6,000 feet (1,800 m), regardless of gauge used. The following formulas are used to generate the wire distances:
Maximum Resistance (Ohms)
Maximum Wire Length (feet)
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:
Wiring Distance Calculation Example:
Suppose a system is configured with the following ANN-BUS modules:
•
3 ANN-80 Remote Fire Annunciators
•
1 ANN-S/PG Serial/Parallel Printer Interface Module
The total worst case current is calculated as follows:
Wiring Configuration
Figure 2.17 illustrates the wiring between the FACP's Primary ANN-BUS and ANN-BUS devices.
ES-50X Series Manual — P/N LS10129-000FL-E:D 4/26/2021
(6,000 feet maximum)
where: Rpu = Ohms per 1,000 feet for various Wire Gauges (see table below)
Wire Gauge
Wire Gauge
ANN-80 Current Draw
ANN-S/PG Current Draw
Total Worst Case Current Draw
TB1
4 3 2 1
ANN-BUS Device
Figure 2.17 Primary ANN-BUS wiring to ANN-BUS Device
2.0 Volts
=
Total Worst Case Current Draw (amps)
Maximum Resistance (Ohms)
=
Rpu
Ohms per 1,000 feet (Rpu)
22
18
16
14
Maximum Wire Length
18
16
14
12
= 3 X 0.040 amps
= 1 X.0.040 amps
ANN-BUS and power wiring are
supervised and power-limited
Primary
ANN-BUS
16.2
6.4
4.02
2.54
312 feet
497 feet
787 feet
1,250 feet
= 0.120 amps
= 0.040 amps
= 0.160 amps
+
-
24 VDC
nonresettable
ES-50X
Installation
x 500
33
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