Half-watt is fine for up to 1 microfarad.

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In Reply to: Re: Yes, but you want to bypass with smaller caps. posted by Aurum on January 31, 2007 at 19:34:33:

A 120-volt line will dissipate 0.25 watts in a 120-ohm resistor connected to a 1 microfarad capacitor. The rating of the resistor should be twice the actual dissipation. With smaller capacitors, the power is even less.
If the capacitor fails to a short (I know that Y-rated caps are only supposed to fail to an open-circuit, but X-rated caps may fail to a short-circuit), the resistor will burn out. Some resistor types will create a flame about as big as a kitchen match. If you use this type, be sure the filter is in a place where such a flame will not set your house on fire.

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Follow Ups Full Thread

Topic - Mains Suppression caps - Aurum 01:04:00 01/30/07 (5)

You can only find small ones. - Al Sekela 10:42:41 01/30/07 (4)

Re: You can only find small ones. - Frank25 21:03:41 01/30/07 (3)

Yes, but you want to bypass with smaller caps. - Al Sekela 13:00:34 01/31/07 (2)

Re: Yes, but you want to bypass with smaller caps. - Aurum 19:34:33 01/31/07 (1)

Half-watt is fine for up to 1 microfarad. - Al Sekela 14:02:57 02/01/07 (0)

Follow Ups

Half-watt is fine for up to 1 microfarad. - Al Sekela 14:02:57 02/01/07 (0)

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