Specifications

Introduction

4.0 Wiring

The RS-485 Wiring to the RAM-3500-LCD is recommended to be Twisted Shielded Pair. The

wire must follow:

• 300mA power limited

• 22 AWG maximum of 2000 feet

• 20 AWG maximum of 4000 feet

• 18 AWG maximum of 8000 feet

• Maximum 40 ohm loop resistance

The 24VDC field wiring needs to be of an appropriate gauge for the number of annunciators

and the total wiring run length.

See 6.2 Current Drain for Battery Calculations on page 22 to calculate the Maximum current

for all annunciators summed together.

For information on wiring the RAX-1048TZDS Annunciator Adder Modules to the Main

Board see RAX-1048TZDS.

Note: All circuits are power limited and must use type FPL, FPLR or FPLP Power

Limited Cable.

Attention: 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.

Table 9 Wiring Table for Indicating and Auxiliary Power Circuits

Total Maximum

Current for all

Annunciators

Maximum Wiring Run to Last Annunciator Max. Loop

Resistance

18AWG 16AWG 14AWG 12AWG

Amperes ft m ft m ft m ft m Ohms

0.06 2350 716 3750 1143 6000 1829 8500 2591 30

0.12 1180 360 1850 567 3000 915 4250 1296 15

0.30 470 143 750 229 1200 366 1900 579 6

0.60 235 71 375 114 600 183 850 259 3

0.90 156 47 250 76 400 122 570 174 2

1.20 118 36 185 56 300 91 425 129 1.5

1.50 94 29 150 46 240 73 343 105 1.2

1.70 78 24 125 38 200 61 285 87 1.0