At 04:01 PM 6/29/2007, firstname.lastname@example.org wrote:
>On 29 Jun 2007 at 17:50, Clint Talmadge wrote:
> > I am glad this thread started. I have a Motor Start Capacitor
> ready to be installed at the base of my tower which is marked
> 130-156 MFD 330VAC . How can I tell if it is polarized or not?
> There are no + or - marks on the terminals and I assumed (I know, I
> know) that it would work.
>If the capacitor is rated for AC, (330VAC) then it shouldn't have a
>polarity marked, should it? Maybe we get confused because AC rated
>capacitors CAN be used on DC (with a voltage rating about 3x the AC
>rated voltage.) But if it's AC rated, then using it on AC is what's
>expected! Am I missing something?
Nope.. if you use it on DC, though, you'll find it's a pretty lossy
cap (at least motor start caps are). In that application (which is
very price sensitive) they don't go to huge efforts to produce a high
quality cap (hence the 130-156 uF rating). As long as it doesn't
explode in the normal usage, they consider it "good enough".
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