Selection of X rated and Y rated capacitor against other capacitor

[shaswat]

In a capacitor drop supply, X rated capacitors are used to drop the AC voltage across it. After searching on internet I find that X rated capacitor are connected in series (line to line) with the circuit. While Y rated capacitor are connected in parallel (line to ground). Due to its high reactance(X rated capacitor) is it used to drop the supply voltage?? What happens if we add another capacitor in series except X rated. Why we are not using Y rated capacitor instead of X rated capacitor??

 

[schmitt trigger]

"X" and "Y" type capacitors are safety-agency rated capacitors for AC line applications. What it means is that they have a self-healing property which, in case of capacitor failure, prevents the user from being electrocuted or a fire hazard.

"Y" caps are rated to be connected from a line to a chassis ground, where a failure would mean electrocution.
"X" caps are rated to be connected across the lines, and a failure would cause a fire.

You can find many capacitors which are dual rated.

 

[shaswat]

So my question is that ,can we replace the x rated cap with the any other cap. x rated cap shows high reactance property. so if I add another cap in series that are used for the filtering purpose it also works as like as X rated cap??

 

[schmitt trigger]

Reactance values, or capacitance values for that matter, have absolutely nothing to do with X or Y caps, or whether they are electrolytic, ceramic, tantalum or film.

Reactance in a capacitor is only Xc= 1/(2*pi*f*C).

Put two capacitors in series and your total capacitance is Ct = (C1*C2)/(C1+C2)

 

[shaswat]

Its not like that when I replacce the X rated with the other one, the cap burst. I might be happens because of low reactance value.

 

[schmitt trigger]

Read my replies, please.

A capacitor would burst only if you exceed the voltage or current ratings. Or if you used a polarized device on an AC line. Reactance does not have anything to do with it, unless you changed it to a different capacitance value.