How much clearing for a PCB?

So I was wondering the following: what is the minimal safe distance for a trough hole pcb to be mounted on a metal enclosure? The pcb will have 12V running through it with at most 2.5A so nothing too exciting.

Hope anyone can answer this one!
 
I typically use 8 or 10 mm long hex standoffs depending on how tight I want it to be. You just have to make sure that long protruding component leads do not come too close to the enclosure bottom even if the PCB or the bottom cover bends due to various use or handling conditions.

Regards,
Oleg
 
Isn't that a bit fragile? The kapton tape that is?

Yes, instead we use Nomex 410 sheet stock, which is very tough and has a high voltage rating.
It can be cut with good scissors, punched, or die cut. We punch it to clear the spacers and install it
between pcbs and the chassis. No need for adhesives, since it is captive.
 
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