At 03:50 PM 6/29/2007, 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.
It will work. Motor Start Caps are designed for AC, hence unpolarized.
What they won't work for is a continuous duty application (like power
factor correction or in a splitphase motor), because they're pretty
lossy, and they get hot. In a rotator application, they run for a
few seconds and stop, so you're ok.
If you need continuous duty, you need "motor run" caps, which are
much larger and expensive for the same capacitance.
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