Extra exam question E4E14
Subelement E4, AMATEUR PRACTICES· Group E4E
What is the purpose of a single point ground panel?
- 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 (correct answer)
WhyA single point ground panel exists to ensure all of a station's lightning protectors activate at the same time. A single point ground panel exists to make sure every lightning and surge protector in the station grounds through the same reference point at essentially the same instant, so no dangerous voltage difference develops between separately grounded pieces of equipment during a strike, answer D. It isn't there to cut AC power during a short circuit, specifically prevent common-mode transients on its own, or eliminate physical air gaps between circuits, those aren't the panel's actual function.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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