
SSCC APPLICATIONS & PROGRAMMING GUIDELINES
_________________________________________________________________________________________________________
4-6
SIG-00-22-02 JUNE 2022 (Revised September 2022)
Version: B.1
4.3.1 Lighting Surge Panels
The A80405 modules use either of two SSCC III Lighting Surge Panel configurations to provide
external I/O primary surge protection.
•
A91170-1, -2 common return gate control, Figure 4-4A and Figure 4-4B
•
A91181-1, -2 isolated gate control, Figure 4-5A and Figure 4-5B
Both Surge Panel configurations provide surge protection on all external I/O interconnects. The
SSCC III Lighting Surge Panels provide:
•
arresters and equalizer for surge protection from transients on underground-cable
battery voltage
•
protection on all other I/O underground cable connections
•
standard AREMA binding posts for connections to the flashing lights, gates, and bells
•
insulated links in the underground cable connections allow quick circuit isolation for
testing and measurements without site cabling removal
•
adjustable resistors in the
NEAR GATE
Lamp 1 (
1 L1
) and Lamp 2 (
1 L2
) circuits
provide compensation for different lengths of cabling to the crossing flashing lamps
allows the system to compensate for unequal voltage drops between the two cables
•
steering diodes for the Crossing Controller Gate Control output to provide isolation
between the two crossing gate controls (see Figure 4-6)
For common return gate control, a single A91170-1 panel (Figure 4-4A) is used for up to 20-
ampere operation, and both an A91170-1 and an A91170-2 panel (Figure 4-4B) are generally
used for 21 to 40-ampere operation. Refer to Figure 4-5A for typical common return gate control
wiring.
For isolated gate control, a single A91181-1 panel (Figure 4-5A) is used for 20-ampere
operation and both an A91181-1 and an A91181-2 panel (Figure 4-5B) are generally used for 21
to 40-ampere operation. Refer to Figure 4-5B for typical isolated gate control wiring.
WARNING
WHEN 91170 OR 91180 PANELS ARE NOT USED WITH THE SSCC,
EQUIVALENT SURGE PROTECTION MUST BE PROVIDED WITH THE
ADDITION OF STEERING DIODES IN THE GATE CONTROL (GC)
OUTPUTS AS SHOWN IN FIGURE 4-6A AND FIGURE 4-6B.
NOTE
For information on the selection and installation of the 91170-1 and
91181-1 SSCC III Lighting Surge Panels, refer to Section 9, Auxiliary
Equipment.