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

Remote annunciator
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4.0

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 11 and
calculate the Maximum current for all annunciators summed together.
i
Note:
!
Attention: Accidentally connecting any of the 24V DC wires to the RS-485 wiring will
Table 4 Maximum Wiring Run to Last Annunciator
Max for all
Annunciators
Amperes
ft
0.12
1180
0.30
470
0.60
235
0.90
156
1.20
118
1.50
94
1.70
78
All circuits are power limited and must use type FPL, FPLR or FPLP Power
Limited Cable.
result in damage to the Annunciator and/or to the Fire Alarm Control Panel to
which it is connected.
18AWG
16AWG
m
ft
m
360
1850
567
143
750
229
71
375
114
47
250
76
36
185
56
29
150
46
24
125
38
firealarmresources.com
14AWG
12AWG
ft
m
ft
3000
915
4250
1296
1200
366
1900
579
600
183
850
259
400
122
570
174
300
91
425
129
240
73
343
105
200
61
285
87
Max Loop
Resistance
m
Ohms
15
6
3
2
1.5
1.2
1.0
9

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