Question
What does the source recommend for bus devices installed on cable ends?
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)
- A.No extra measures, because basic immunity is always sufficient.
- B.Primary protection only, via a lightning current arrester.
- C.Removal of the terminating bus connector.
- D.Additional secondary protection (an overvoltage protector).✓
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