I need guidance for passing the IEC 61000-4-5, 2 kV Surge test from the AC ground (protective earth, PE) to the neutral and live wires. This grounding techniques may be a bit different that passing FCC or CE emission tests and a bit more complicated.
How does DC board grounding be done in a multiple boards design interconnected (e.g. USB) installed in a metal enclosure feeding off an AC power supply? This is a bit more complex than a single board connection to Chassis ground.
Should the AC ground and DC power supply grounds be tied to the metal enclosure at one point by the power supply module and all the other board DC grounds be isolated from the metal enclosure or the boards DC grounds should also be solidly i.e. low inductance be connected to the metal enclosure?
What about the board interconnect cable shields (e.g. USB)? Should these be connected to each board DC ground or connected to the chassis ground and totaly isolated from each board DC grounds?
It is assumed that digital ground and DC ground are the same on all boards and there are no analog circuitry involved.