Question
Why should overvoltage protectors be removed before measuring the insulation resistance of the bus cable?
Answer
B — So the measurement is not influenced and the overvoltage protector is not damaged.
Correct: Overvoltage protectors should always be removed before the test so that the measurement is not influenced and the protector is not damaged.
Source
KNX Basic Course Documentation — 17.4 — p. 119
All proposed choices (exam context)
- A.Because overvoltage protectors are only fitted on mains cables, never on bus cables.
- B.So the measurement is not influenced and the overvoltage protector is not damaged.✓
- C.To raise the test voltage above 250 V DC.
- D.Because the protectors must be replaced after every insulation test.
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