I am trying to figure out how to wire my project so I have read the wiring guide from Pangolin. I understand the advantages of using a single point grounding scheme, but I am not sure when to use it. In my projector I have 3 power supplies: a 15V supply (for flexmods), a 5V supply (for 473 and 532 DPSS), and a +/- 12V supply. The +/- 12V supply powers a stanwax ilda interface board which controls the power to the other two power supplies. So my question is should I connect the grounds of all the power supplies together? There are no phantom grounds. It seems as though keeping each supply's grounds separate would be better, and then use multiple independent single point wiring schemes.