[Test-Equipment] Question regarding film capacitor voltage rating

[Barry]

Hello Ed,

I was thinking the same thing.  If it is indeed 700VAC, then even a 1kV is on the edge but not sure where I can source higher rating caps that will fit.  There's "some" room but it's not all that much.  The 0.47uF 1kV radial fits and a slightly larger one would as well.  The 0.033uV 630V is a bit smaller and can probably use something larger there.  I'll keep looking.

Thanks,
Barry - N4BUQ

----- Original Message -----
> From: k4pf at juno.com
> To: test-equipment at mailman.qth.net
> Sent: Monday, June 21, 2021 2:16:47 PM
> Subject: Re: [Test-Equipment] Question regarding film capacitor voltage	rating
> 
> 
> 
> Barry <n4buq at knology.net> wrote
> 
> <snip>
> 
> The 0.47uF is rated at 1kV (an Illinois Capacitor 474MSR102K) and the 0.033uF
> is also an Illinois Capacitor rated at 630V (I don't have the I/C part
> number handy for that one).
> 
> According to the Illinois Capacitor website, the 474MSR102K (0.47uF) cap is a
> DC rating and I presume the 0.033uF cap is also a DC rating.
> 
> With ~700VAC, what DC rating is safe for those caps?  The transformer works
> just fine but I'm concerned about running one or both of those caps near the
> edges of their ratings.
> 
> UNQUOTE
> 
> Hi, Barry
> 
> I would go with 1KV DC as the minimum rating
> for the film caps (1.414 X 700V). Of course,
> it's always safer to use a higher voltage rated cap,
> since you have the space to fit them in.
> 
> 73,
> Ed Knobloch
> 
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