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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?

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    \$\begingroup\$ These 'standards' branch out into more specific standards, such as UL1449 3rd and 4th edition, for surge protection devices (SPD). Read my answer to "How did this capacitor survive having a nail driven through it?" The standards can vary based on product type. Medical standards are the toughest. \$\endgroup\$ – VTNCaGNtdDVNalUy Apr 6 '18 at 21:18
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    \$\begingroup\$ The link is:electronics.stackexchange.com/questions/357025/… \$\endgroup\$ – VTNCaGNtdDVNalUy Apr 6 '18 at 21:19

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