> I need to replace a faulty capaitor trimmer on my T.V
> I now that the chasis of T.V.'s is live so does this mean
> that the T.V componenets are rated for 220V. Does 
> this mean I cannot use a 50V cermaic capacitor to
> replace the trimmer? (it belongs to the colour osc)

"live" is relative. Any point within any circuit is relative to another,
although they both may be ground referenced. For example, if
two points are different by just 5V, then you need a component,
a resistor or capacitor say, that is rated for just 5V, even though
it may have 1000V on one terminal and 995V on the other. All
that generally matters is the voltage drop or potential difference
across the component

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