[dmos62]

Wouldn't the power supply ground all static?

[barkingcat]

this case is conductive, precisely so the excess charge can be grounded by the power supply by being in touch/contact with the psu metallic casing.

the psu is grounded, but the static has no way of getting to ground (via psu) if the case itself is non-conductive.

[ludicrousdispla]

Probably not guaranteed, I've often wondered why my clothes out of the dryer have a static charge when the dryer is plugged into a grounded outlet.

[maxbond]

That had never occurred to me but is a great question. I suppose between the poor conductivity of the fabric and the paint inside the dryer, the system is very well insulated. Maybe a dryer with bare walls could be antistatic without the use of dryer sheets. But maybe that would be a fire hazard.

[bob1029]

As the clothes get dryer they become less conductive. Even if there was a perfect path to ground, the charge wouldn't be able to get there across the material itself.

[tengbretson]

That can't be the whole story though. You can feel the static charge from the clothes on your hand when you reach into the dryer a good 6-12" before you even make contact with the clothes.

[bob1029]

We have the ability to sense these electric fields way before they reach breakdown potentials.