Specifications

Wiring

7.0 Wiring

This chapter describes the proper field wiring for the FX-3500.

7.1 Wiring Tables

7.1.1 Addressable Loop Wiring Maximums

Advanced Protocol and CLIP Devices

• Maximum Loop Current = 350 mA

• Maximum Loop Resistance = 40 ohms

• Maximum Loop Capacitance = 0.5 μF

• Maximum Number of Isolators = 20

7.1.2 RS-485 Wiring to Annunciators and other Devices

• Use twisted shielded pair

• 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

7.1.3 NAC and Auxiliary Power Supply Circuits

Table 19 Advanced Protocol and CLIP Devices Addressable Loop Wiring Table

Wire Gauge Maximum Wiring Run to Last Device

(AWG) ft m

18 3030 923

16 4760 1450

14 7690 2343

12 9820 2993

Table 20 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