Specifications

FX-350 Series Installation and Operation Manual
19
Field Wiring
Main Fire Alarm Board Field Wiring
Wire devices to the addressable loop as shown in Figure 9 for Class B (Style 4) or Figure 10 for Class A (Style 6).
Refer to the Table 2 for loop wire gauges. Wire devices to addressable loops 2 and 3, if available, in the same
manner.
Figure 9: Addressable Loop Wiring - Class B or Style 4
Table 3: Loop Wiring Table
Loop Isolators
To limit the number of addressable devices compromised by a short on the addressable loop, isolators (MIX-100X,
100XH, or 100XB) may be used to isolate the affect of the short circuit. If the impact of a short circuit must be limited
to only one device, an isolating base must be used for each detector. A maximum of twenty devices can be
connected between isolators, or between the panel and the first isolator, as long as the maximum in-rush current for
the devices on one segment of the loop does not exceed 20mA. Refer to the installation instructions for
addressable devices for additional details.
UNSHIELDED
TWISTED
PAIR WIRE
GAUGE
LOOP TOTAL (OUT AND
IN) WIRE RUN
AWG FEET METRES
12 20,000 6098
14 15,942 4859
16 9960 3036
18 6265 1910
CLASS B
WIRING
ION SMOKE
DETECTOR
PHOTO SMOKE
DETECTOR
HEAT DETECTOR
PULL STATION
Loop
A
+-+-
B
OUTPUT MODULE
This Loop Wiring Table is for reference only and should not be
used without a detailed loop calculation.
Maximum Loop Current: 350 mA
Maximum Loop Resistance: 35 subtract 0.2 Ohms per isolator.
Maximum Loop Capacitance: 0.5 uF
Maximum Number of Isolators is 40.