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Re: [TCML] plastic cap

Hi DC,
That's even better, then. 25 kVAC would be good for 75 kVDC, not 57 kVDC. I didn't realize that PCI caps were the "Cadiallac" of high voltage capacitors. That makes me feel even better about my 0.1 uFd, 25 kVAC PCI pulse cap, as at 35 lbs., it is obviously a hause ;^)) 

David Rieben
----- Original Message ----- From: <resonance@xxxxxxxxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Thursday, January 17, 2008 10:20 AM
Subject: Re: [TCML] plastic cap







All PCI caps are rated at 3.0 x Erms value.  This info directly from the
Pres and Sr. Engr.

Dr. Resonance





Hi Marko,

I realize Plastic Capacitors of Chicago, Inc. has a pretty
big line of high voltage capacitors. A quick view of their
products page at: http://plasticcapacitors.com/product_index.html
reveals that the "BNZ" series are obviously the most de-
sirable capacitors for Tesla service. It appears this series
is only built in small runs according to customer specifica-
tions, though. I'm sure a few of the other mass produced
varieties with the proper voltage/capacitance rating would
probably still work, though.

I have been fortunate enough to come across an unused
Plastic Capacitors BNZ 2500-104 unit that's rated at
0.1 uFd, at 25 kV(AC) at 60 hz, not "DC". From what
I've gathered, it appears that you can determine a 60 hz AC
rated capacitor's DC voltage rating by multiplying the AC
voltage rating by about 2.3. Most of the motor run or snub-
ber caps that have a dual AC/DC (not the Australian rock
band) voltage rating will seem to depict this - i.e. 440 VAC
or 1000 VDC, 660 VAC or 1500 VDC. That would depict
an equivalent DC rating of my "BNZ" cap at nearly 57 kV
(DC).

As a side note, a quick view of Plastic Capacitors' home
page, http://plasticcapacitors.com/, also reveals that they
actually have a "Tesla coil capacitors" icon, although this
icon appears to be inactive.

David Rieben


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