Insulated caps touching chasis

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I have a beginner question.
I replaced the bias filter caps in my dynaco pas with standard insulated axial caps. The capacitor bodies are touching the the chasis and the metal clamp on top of them, just like the old ones and it got me to thinking....


is it bad practice to put insulated caps in contact with chasis ground?
Is the covering on the components enough to safely install them like this?
 
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It should be fine if not exposed to any vibration issue that would cause rubbing against the chassis,
like loud music. But you could always add a bead of silicon glue between the capacitor and chassis
to prevent wear and add an additional layer of insulation.


Dielectric Strength kv/mm (v/mil)20 (500)



https://asaptec.com/wp-content/uploads/2016/04/RTV120.pdf
 
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