To add to this, I used 1,000vac rated ceramic caps in a VFD once some years
back and they failed in spectacular fashion. This was in a 277vac system. Such
caps should NOT be used on the AC line!
Use the ones intended for AC line filtering. They tend to be film caps and they
are intended for this purpose.
-Bill
Sent from my iPhone
On Feb 4, 2015, at 8:01 PM, "Jim Brown" <jim@audiosystemsgroup.com> wrote:
> On Wed,2/4/2015 4:30 PM, Charlie Cunningham wrote:
>> For AC line bypass capacitors look for UL-rated Ceramic Disc capacitors that
>> typically have AC working voltages like 250 VAC or higher. These are
>> designed and rated for AC line service and can take the surges that occur on
>> AC lines.
>
> WRONG! As noted in an earlier post, capacitors for use on the AC line must be
> rated specifically for that use, which includes continuous 120VAC or 240VAC,
> AND the ability to withstand voltage spikes in the range of 3-6kV. The types
> are X1 and Y2. See page 21 in k9yc.com/RFI-Ham.pdf
>
> 73, Jim K9YC
>
>
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