Question

What does the source recommend for bus devices installed on cable ends?

KNX BasicLearnKNX InstallationMedium
Answer

D — Additional secondary protection (an overvoltage protector).

Correct: additional secondary protection should be provided for bus devices on cable ends.

Source

KNX Basic Course Documentation — 15 — p. 115

All proposed choices (exam context)
  1. A.No extra measures, because basic immunity is always sufficient.
  2. B.Primary protection only, via a lightning current arrester.
  3. C.Removal of the terminating bus connector.
  4. D.Additional secondary protection (an overvoltage protector).
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Last updated: 19 May 2026

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