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How large can the capacitance be in parallel AC filter?

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How large can the capacitance be in a DIY parallel AC filter?

Unfortunately, a person can touch the metal poles on the male AC power plug. That causes safety issue, I think.

Suppose somebody unplugs parallel filter at the moment when the capacitor inside is at peak voltage: 120 X 1.414 volts = approx 170 Volts. (240 X 1.414 = approx 340 Volts in the UK)

If the capacitance is large, the capacitor holds large amount of electrical charge at that not-so-safe voltage. The energy stored in the capacitor is (1/2) * C * V^2.

If somebody touches the metal on the unplugged male power plug of that parallel AC filter, then the large amount of electrical energy is dissipated through his/her finger. Isn't it dangerous?

Is there any circuit which shorts the capacitors at the moment it detects unplugging of the power cord from the wall outlet?

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