I was wondering, when an S/FTP cable has some outer noise and there is electricity induced in its shielding, where does it go? I have a keystone wall outlet which is metal (with plastic cover), and the keystone modules are metal as well. Does the electricity flow through these metallic elements and go to the wall by the outlet, or does it go to the grounding of the router? If the second option is true, can it cause any problem in the system when I don't have a grounded router?
Edit: Snip Tyson already linked Siemons paper.
That gives a pretty good idea of the setup.
In a nutshell the mechs in the patch panel are earthed via the patch panel to the rack frame which then should be bonded to a communications earth.
Not sure what standards are worldwide, in Australia the communications earth is bonded to the electrical earth at the switchboard or earth stake.
There will be relevant standards regarding distances, cable sizes and colours and so on. Should be covered under electrical or comms standards.