Hello everyone, So I am doing this EMC course and got to a section about cable shielding. It was suggested that the best way is to have a 360 connection to the chassis and to connect the ground of the PCB to the chassis as to provide a better return path for the current. It has been suggested a few times in this course to bond the chassis ground to the PCB ground. For some of the products I design I will use a rackmount case that will have some AC/DC power supplies in them. These power supplies will provide power to various PCBs inside the case. I always attach the AC earth to the chassis for safety reasons. What I am wondering is if it is safe to attach the DC ground to the chassis if that is being used for the AC earth? Will this remove the isolation provided by the AC/DC supplies? Is may be better for EMC, but am I compromising safety by doing this? Any insight into this would be greatly appreciated. If you want/need more information please don't hesitate to ask! Thanks!