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Old 21st December 2003, 11:48 PM   #1
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Default Electrolytic Capacitor Insulation

This may have been discussed already, but I didn't find anything with a quick search.

Is there any data on the insulation value of the plastic on modern electrolytics? I'm thinking of the situation where the can is above ground by a significant voltage (say in a negative supply) and where the capacitor may be in close proximity to grounded components or in contact with the chassis itself, insulated only by the plastic layer.

Thanks for the help.
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Old 22nd December 2003, 01:42 AM   #2
SY is offline SY  United States
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I thought that the can was isolated on modern (i.e., non-twistlock) caps. In any case, the plastic layer is way thicker than anything you'll find inside a high voltage film cap, so I wouldn't worry about it too much. It's got to be good for a multiple of the cap's working voltage.
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Old 22nd December 2003, 06:20 AM   #3
dhaen is offline dhaen  Europe
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I would not rely on the plastic film for more than 200v or so. Probably fine for a bias supply
Plastic clips are available now, which I use for higher voltages.
I'm not sure how well isolated the cans can be. In the past I've seen leakage to "isolated cans" that has caused trouble.
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