Honeywell Fire-Lite Alarms MS-5UD Series Manual page 43

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 Fire 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:
ANN-80 Current Draw
ANN-S/PG Current Draw
ANN-I/O Current Draw
Total Worst Case Current Draw
Using this value and referring to the Wiring Distance Table 2.1 on page 42, 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

MS-5UD & MS-10UD Series Manual — P/N 52626:C2 1/24/2012
Wire Gauge Ohms per 1,000 feet (Rpu)
22
18
16
14
Wire Gauge Maximum Wire Length
18
16
14
12
= 2 X 0.040 amps
= 1 X.0.040 amps
= 1 X.0.200 amps
16.2
6.4
4.02
2.54
312 feet
497 feet
787 feet
1,250 feet
= 0.080 amps
= 0.040 amps
= 0.200 amps
= 0.320 amps
Installation
43