275v ac = 389v peak, which can be withstood by a 389v rated capacitor. The reason they used 600v was to improve safety & reliability. However time showed that it wasn't good enough. X & Y caps are much better attempts to address the failure/safety issues.
NT
You are very good at math, but not so good at electronics. You don't need to consider the peak to peak voltage because the cap doesn't see them both at the same time. It sees one peak, then it sees the other peak. The fact that they are opposite polarity doesn't mean you need to add them to consider the capacitor voltage rating.
-- Rick C Viewed the eclipse at Wintercrest Farms, on the centerline of totality since 1998
Sorry but that ain't so.
NT
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** Nonsense, the DC rating is not exceeded by a reversing voltage.** False.
It's simply that 600V rated caps survive much better.
AC supply and load bridging involves spike voltages that can break down the insulation.
..... Phil
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