Grounding - Optex Fiber SenSys Terrain Defender TD 100 Installation Manual

10. Grounding

Lightning protection circuitry for the Terrain Defender Sensor Cable (TDSC) is provided at the
Start-Up Module (SUM). The ground connection is made from the SUM stainless steel
enclosures ground lug,
between the sensor cables. Grounding protects the system from damage but does not affect
detection or system function in any way.
The SUM ground wire passes through the grommet of the SUMA, as shown in Figure 56. The
ground rod or plate should have a 10 Ω resistance maximum. In the event of lightning striking
the ground and conducting through the sensor, this provides a direct path to ground.
Ground Rod/Plate
Ground Rod/Plate
Centered between BSE
Page 79
Figure 55, then routed to a ground rod or plate installed midway
Figure 87. Ground rod or grounding plate centered between SUMA
Power
Distribution
Module
(48VDC)
Figure 88. System grounding
TD100
10Ω Earth to
Ground resistance
BSE
STM
STM
BSE
STM
STM
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