pedroskova said:If you're talking about ASC or GE motor run caps, 1.4x AC rating would be pretty conservative. I think a GE engineer told someone that the 440V motor runs were safe with 1000VDC. I wouldn't do that, but it's an indicator of sorts.
I was also told that doubling the AC voltage rating of ASC caps for DC was safe. However when I built a pair of power supplies using them I went with 1.4x as a maximum!
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