Discussion
True or false: repeating a high-voltage withstand test on aged insulation is harmless.
Answer: C
Correct answer: False, since the test itself can damage insulation that has aged
A high-voltage withstand test stresses the insulation and does a little damage each time, which sound new insulation absorbs without consequence. Aged insulation with voids and tracking may not, and repeated testing can precipitate the failure the test was meant to guard against. Standards therefore specify reduced voltages for repeat and maintenance testing.
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