[R-390] Cap Voltage

[KR4HV]

Morning: I have put two files containing information concerning an inquiry I
made regarding using AC rated capacitors for DC voltages.  

These files may be of interest to some.

BTW, I didn't make them available to start a "I know more than you" confab,
but only to provide the response that was sent to me by a manufacturer.

You can see them on BOX.com in my "KR4HV" folder.

Regards,

Walt
KR4HV

-----Original Message-----
From: R-390 [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Charles
Steinmetz
Sent: Monday, July 21, 2014 2:07 AM
To: 390 list
Subject: Re: [R-390] Cap Voltage

Roger wrote:

>There was once thread on AC caps and how much DC voltage could be used 
>on them in a power supply.
>If my cap is marked 400VCA 20UF how much DC can I apply to the cap if I 
>use it as a filter cap in a DC power supply and want it to last?

Much, much less than 400V, but I'm not aware of any generalized conversion
factor.  It all depends on the particular cap design.  I once put this
question to a Sprague capacitor engineer, and he looked at me cockeyed and
said, "Don't ever put DC on AC-rated caps.  They're not designed for it.  We
make DC-rated caps for that."

Best regards,

Charles



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