I've realized that while i'm pretty comfortable with 12v in general, I had a question I couldn't find an answer to yet.
3 prong vs 2 prong power connectors, for plugging into wall outlets.
I've seen sff builds and electrical devices done with 3 and 2 prong connectors.
Where is the line drawn that determines you need to go 3 prong instead of 2?
using an xt60/xt30 wouldl be a lot easier than an mr30 for me, but I recognize the importance of proper grounding.
It's a matter of safety. If you have a metal case it should be properly grounded so that in case of a fault (e.g. damaged insulation on L or N wire) the RCCB can trip and you don't get electrocuted.
I guess without any grounding something like this could have ended even worse:
Power adapters like the ones that come with a notebook don't need to be grounded because the case is made from plastic (insulated) and the AC input is galvanic separated from the DC output (e.g. using an optocoupler)