Although not specifically dealing with capacitors in snubber applications,
this tech note may be of help

http://www.evox-rifa.com/technote_pdf/rfi_fact.pdf

It does a least explain why you should be using a type X capacitor.

Other tech notes on capacitors on that site are listed at
http://www.evox-rifa.com/europe/technotes_filmcaps.htm
Note the integrated RC snubber capacitors close to the bottom

See also
http://www.evox-rifa.com/europe/pulsecad.htm

which describes their free program PulseCAD which you may find of use

regards
Chris



> I would like recommendations from the list for a snubber network to use
> with a 400 V Triac on a 120 VAC power line.
>
> Requirements:
>
> 1) Load inductance ~ 200 uH (lines to resistive heater).
> 2) 400 V 8 A triac, expected full 8 A load possible.
> 3) 120 VAC, 60 Hz power line.
> 4) Ignore load resistance for the estimation (i.e., assume pure 200 uH
> inductive load).
>
> Questions:
>
> 1) What R and what C are ideal for this application?
> 2) What voltage requirement for C?
> 3) What voltage and wattage requirement for R?
>
> Thanks.

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