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AUXILIARY EQUIPMENT
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7.3.4.6
Application Installation, 7A377-2-f
The coupler terminals are connected as follows:
Terminals A & B are connected to the wire leads that are connected to the equalizer that is
connected to the appropriate gauge twisted pair track wires, which are connected to the rails.
Terminals C & D are connected to the wire leads that are connected to the sealed equalizer that
is connected to the #14 AWG twisted pair of line wires that are connected to equipment shelter
surge panel terminals that are in turn connected to Terminals A & B of the 7A388
The Receiver Line to Rail Coupler, 7A377-2-f should be used when the distance from the
receiver to the track is between 300 ft. (30.52 m) but less than 2000 ft. (609.6 m) (based on
using 14AWG, increasing the diameter of the wire will proportionally increase the potential
distance from 2000 feet). The Receiver Line to Rail Coupler, 7A377-2-f is used in conjunction
with the Line to Receiver Coupler, 7A388.
7.3.5 Transmitter Line to Rail Coupler, 7A399-f
7.3.5.1
Equipment Description, 7A399-f
The Transmitter Line to Rail Coupler, 7A399-f couples the transmitter line to the track (see
Figure 9-6). The 7A399-f coupler assembly consists of a tubular PVC plastic enclosure with
mounting brackets at the base. There are four AREMA binding posts on the top of the assembly
that provide connections to the circuits housed within the sealed units (see Figure 7-12).
The Transmitter Line to Rail Coupler, 7A399-f should be mounted in a
weatherproof shelter located within 100 ft. (30.5 m) of the track
connection. The track wire connecting the Transmitter Line to Rail
Coupler, 7A399-f to the track should be #6 AWG.
7.3.5.2
Mounting Dimensions, 7A399-f
Mounting Dimensions for the Transmitter Line to Rail Coupler, 7A399-f are as follows:
Dimensions:
3.50 inches (8.89 centimeters) in diameter
7.75 inches (19.69 centimeters) high (to top of AREMA binding posts)
Weight:
4 pounds. (1.81 kilograms) (approximate)
SIG-00-22-02
Version: B.1
NOTE
7-14
JUNE 2022 (Revised September 2022)
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