caps for mots

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Original poster: "Justin Wright by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ellis_p-at-picknowl-dot-com.au>

Hi All,

I found this in the archives

====================
>>The NST peak voltage is 15000 x SQRT(2) = 21,213 volts	give or take a 
few thousand. Ten MMC caps can easily take that. My testing showed that the 
caps will arc internally at 5700 volts each. They just self heal which they 
can do 1000's of times so no problem in any case.
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I am planning on running 6 mots for about 12600 v.    Do I need to also 
multiple the voltage by sqrt(2) to work out the peak voltage that my caps 
need to handle?  This comes to 17819 v.  Does my cap have to handle at 
least this or just close? I will be using cornell  942 series caps.
I had planned to use caps in series to handle 16000v until I read this.
thanks
Justin.