For my server I will use a Raspberry Pi 3/4 as KVM. Instead of pulling the current for the Raspberry from the PSU's +5 VSB, I will use the (new) USB-C power supply of Raspberry. It has wires with a gauge of 18 AWG.
However, the Raspberry will reside within the case. Therefore, I want to solder an XLR male connector onto the Raspberry power supply cable (so XLR instead of USB-C or Micro-USB) and to the server case I will assemble an XLR female socket. The XLR male jack (Neutrik NC3MXX) is suitable for cable diameters from 3.5 to 8.0 mm and as the power supply cable is round and 3.5 mm thick, this will work perfectly.
I will then connect the two soldered cables of the XLR female socket to this cool adapter:
As to my other question about the Ethernet port grounding, I have the same question here:
The server case is grounded, thus the XRL female socket will be too. Do I need to make sure that the Raspberry power supply ground connected to the XRL female socket has no connection to ground (due to the metal chassis of the socket) of the PSU? As with XLR connections sometimes - not always - pin 1 is not only connected to the shield of the XLR cable, but also to ground (earth), I think it would be consequential to only use pin 2 (+) and pin 3 (-) and leave pin 1 unconnected.