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.

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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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