Honeywell Fire-Lite Alarms MRP-2001 Instruction Manual page 35

ANN-BUS Devices
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:
• 2 ANN-80 Remote LCD Annunciators
• 1 ANN-S/PG Serial/Parallel Printer Interface Module
• 1 ANN-I/O LED Driver Module
The total worst case current is calculated as follows:
Using this value and referring to the Wiring Distance Table 2.1 on page 34, it can be found that the
available options are:

463 feet maximum using 22 Gauge wire
 1,172 feet maximum using 18 Gauge wire

1,866 feet maximum using 16 Gauge wire

2,953 feet maximum using 14 Gauge wire
MRP-2001 Series Manual — P/N 53040:H 1/26/2017
Wire Gauge
22
18
16
14
Wire Gauge
18
16
14
12
ANN-80 Current Draw
ANN-S/PG Current Draw
ANN-I/O Current Draw
Total Worst Case Current Draw
Ohms per 1,000 feet (Rpu)
16.2
6.4
4.02
2.54
Maximum Wire Length
312 feet
497 feet
787 feet
1,250 feet
= 2 X 0.040 amps
= 1 X.0.040 amps
= 1 X.0.200 amps
Installation
= 0.080 amps
= 0.040 amps
= 0.200 amps
= 0.320 amps
35