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7.0 Wiring
This chapter describes the proper field wiring for the FX-400.
7.1 Wiring Tables
7.1.1 Addressable Loop Wiring Maximums
MGC Devices
• Maximum Loop Current = 350 mA
• Maximum Loop Resistance = 40 ohms
• Maximum Loop Capacitance = 0.5 ȝF
• Inductance shall not exceed 1 mH
Shield for Analog Loop Wiring: Only twisted pair is recommended, but if shielded twisted
pair is used, wire shield at the start and the end of the loop to the terminals marked Shield at
the loop adder board.
7.1.2 RS-485 Wiring to Annunciators and other Devices
• Use twisted shielded pair
• 22 AWG maximum of 2000 feet
• 20 AWG maximum of 4000 feet
7.1.3 NAC and Auxiliary Power Supply Circuits
Table 12 MGC Devices Addressable Loop Wiring Table
Wire Gauge Maximum Wiring Run to Last Device
(AWG) ft m
12 10,000 3049
14 7971 2429
16 4980 1518
18 3132 955
Table 13 NAC and Auxiliary Power Circuits Wiring Table
TOTAL
SIGNAL
LOAD
MAXIMUM WIRING RUN TO LAST DEVICE (ELR) 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
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