Black attaches to brown (hot)
White attaches to blue (neutral)
Green goes to green/yellow (ground)

I think you’re looking at the circuit incorrectly. The white and black wires are on the load side of the line filter(After the fuse.) Connecting the service outlet there would add the fuse and the filter to the circuit.

The brown, blue, and green/yellow wires come from the wall. That is where I would attach the service outlet.

In this case the power coming in is brown, blue, and green/yellow.

It is a common color code for single phase wiring in the EU and other countries. In the US Black, white and green is the standard color code. However I have seen the EU color code used in many electronics.

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