Reply by RonInOhio

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Posted on Problems with table saw tripping circuit

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721 posts in 2893 days

#1 posted 01-10-2013 08:11 PM

Several factors could be causing the saw to draw a higher current than what the circuit is rated for . I won’t get into the science of motor lag in which the capacitor is designed to provide a surge of current to the motor. Nor will I get into working amps vs. start-up amps.

Just know that its easier to replace a capacitor which has lost its ability to maintain an electric field. A break down of the dielectrics in the cap will cause its opposition to current flow to decrease. Thus its resistance has decreased, (capacitive reactance) . By ohms law, I=E/R. So if the capacitive reactance decreases , then R in the formula decreases and I increases.

Of course the motor windings could also be at fault. But its much more likely its the capacitor. And that is a simple change out . Especially compared to unbolting the motor and sending that back. If you aren’t comfortable with checking the cap you might get Radio Shack to test it for you.

If you have a 30 amp circuit that would be ideally the best way to see if the circuit still trips. However, if the manual says its designed to run on a 20 amp circuit , then it should.

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