Wiring - Mircom RAM-300LCD Series Installation And Operation Manual

Wiring

To wire the RAM-300LCD, you must first remove the dead front plate. Wire from the last RAM-300LCD to the next
RAM-300LCD and so on; then from the first RAM-300LCD to the Fire Alarm Panel. There are only two connections
to be made, one for power and the RS-485 loop. Replace the dead front plate once all functional setup and wiring
is complete.
The RS-485 Wiring to the RAM-300LCD is recommended to be Twisted Shielded Pair. The wire gauge may be
• 22 AWG up to 2000 ft.
• 20 AWG up to 4000 ft.
The 24V DC field wiring needs to be of an appropriate gauge for the number of annunciators and the total wiring run
length. See Current Drain for Battery Calculations on page 7 and calculate the Maximum current for all
annunciators summed together.
Note: All circuits are power limited and must use type FPL, FPLR or FPLP Power Limited Cable.
CAUTION: Accidentally connecting any of the 24V DC wires to the RS-485 wiring will result in damage to
the Annunciator and/or to the Fire Alarm Control Panel to which it is connected.
Total Maximum
Current for all
Annunciators
Amperes
0.12
0.30
0.60
0.90
1.20
1.50
1.70
Maximum Wiring Run to Last Annunciator
18AWG 16AWG
ft m ft
1180 360 1850
470 143 750
235 71 375
156 47 250
118 36 185
94 29 150
78 24 125
14AWG
m ft m
567 3000 915
229 1200 366
114 600 183
76 400 122
56 300 91
46 240 73
38 200 61
RAM-300LCD Installation and Operation Manual
Max. Loop
Resistance
12AWG
ft m Ohms
4250 1296
1900 579
850 259
570 174
425 129
343 105
285 87
15
6
3
2
1.5
1.2
1.0
5