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Is it safe to use an Y2 Capacitor where an X capacitor used to be? I mean Y should be safer right? So Y2 where X should be is OK, but not the other way around, right?

JohnyTex
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Most Y rated caps are also approved for use as X rated caps. Look at the marking on the cap, you should find something like X1Y2, or X1/Y2, which means that it has been approved for use as either a X1 rated or Y2 rated cap.

Steve G
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  • It is one of these:http://www.digikey.se/product-search/en/capacitors/film-capacitors/131088?k=PME271Y&pv13=40&pv1292=25&FV=fff40002%2Cfff80010&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25 that is replacing a similar rated X-cap in an old sewing machine. – JohnyTex Jan 23 '16 at 19:09
  • @JohnyTex that one doesn't show in it's datasheet as being X1 or X2 rated. However Digikey has [these 3](http://www.digikey.se/product-search/en/capacitors/film-capacitors/131088?k=&pv508=143&FV=fff40002%2Cfff80010%2C142798%2C142799%2C340028&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25) which have the same capacitance which are X1 or X2 rated, so why not just use one of those? – Tom Carpenter Jan 23 '16 at 20:22
  • I already bought it and mounted actually. Do you think I have something to worry about? – JohnyTex Jan 23 '16 at 21:05
  • So what can happen electrically? I won't hold anyone accountable. ;-) – JohnyTex Jan 25 '16 at 07:44
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    @JohnyTex Since this is just for a repair it will be OK. – Steve G Jan 25 '16 at 08:33