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Placing capacitors in parallel is additive. Two 30 ufd capacitors in parallel = 60 ufd. Of course, the voltage rating for both capacitors must be high enough for the application. I have done this several times using capacitors of equal voltage rating with no problems.
Placing capacitors in series is like placing resistors in parallel. The final capacitance value is determined like the reistor parallel network. Cf = (c1 x c2)/(c1 + c2). If the capacitors are equal in value, the final value is 1/2 the value of one of the capacitors, two 30 ufd capcitors in series = one 15ufd capacitor. This is usually done to improve the voltage rating of the capacitor network, not to increase capacitance.
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