Amateur ExtraE4E14
What is the purpose of a single point ground panel?
D
Answer
Receivers, transmitters, and measurements
Type
A
Remove AC power in case of a short-circuit
B
Prevent common-mode transients in multi-wire systems
C
Eliminate air gaps between protected and non-protected circuits
D
Ensure all lightning protectors activate at the same time
Answer Notes
A single point ground panel (SPGP) is a central connection point where all external lines, such as coax and rotor control cables, enter a structure and connect to their respective lightning surge protectors. By mounting all protectors on the same heavy copper panel, you tie their grounds directly together.
When a lightning strike occurs, massive currents flow and can create massive voltage drops across even short lengths of wire due to inductance. If the protectors were grounded at different physical locations, these voltage differences could cause them to fire at different times.
By keeping them all on a single point ground panel, you ensure that there is virtually no potential difference between the protectors. This guarantees they all activate at the exact same time, preventing a damaging voltage surge from traveling through your equipment to find another path to ground.
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