I am researching AC vs. DC hi-pot testing.
According to UL 508 and IEEE 421.3, a hi-pot test should, among other things, subject the unit under test to 1000 volts plus twice the rated voltage of the equipment for industrial control equipment rated 51 – 600 volts, for 1 minute at 60 Hz.
However, I have repeatedly seen references to multipliers that permit a manufacturer to hi-pot test a product at some multiple of the above calculation for a shorter or longer amount of time. For example, in this article, the author states, "A typical rule of thumb is 110 to 120% of 2U + 1000 V for 1–2 seconds."
What standard, if any, do these multipliers appear in? Or is this just an easy way to test a preliminary design to see if you're in the neighborhood, and not ever used for final testing?
Related question: I have read that Y caps can be removed for hi-pot tests (since the purpose is to test insulation suitability, not component ratings), but again I have not seen this spelled out in a standard. In which standard, if any, is this called out?
