One of the most problematic EMI events for your product!
It won't matter if you have a metal enclosure or a plastic enclosure; you always have to make sure you have the right preventive measures in place.
In this picture, you see how ESD can easily couple through the parasitic capacitance between the metal cabinet and your electronic product contained in a plastic enclosure.
This is perhaps one of the toughest ESD troubles to solve because it is hard to create paths where the ESD event can be diverted.
We have a few possible solutions in order of preference:
- Divert the ESD to an extra metal plane inside the product.
- Divert the ESD to a dedicated I/O ground.
- Divert the ESD to the signal ground, with components to limit the injected current.
Like I said, it's not an easy choice.
Watch out for that one.
The good news?
EMC is not black magic.
If we can explain it, we are halfway there to fixing this!
I hope this helps,
Dario
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