I need guidance for passing the IEC 61000-4-5, 2 KvkV Surge test from the AC ground (Protective Earthprotective earth, PE) to the Neutralneutral and Livelive wires. ThisThis 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 Supplypower supply? ThisThis 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)? ShouldShould these be connected to each Boardboard DC ground or connected to the Chassischassis ground and totaly isolated from each board DC grounds.?
It is assumed that Digitaldigital ground and DC ground are the same on all boards and Therethere are no analog circuitry involved.
