legal, but its a real messy job. You're not supposed to insert cable from both sides of a domino, but together in the same hole (so as they are in direct contact, as opposed ato the metal part of the domino acting as connector). @digitalflogging looks like wires had been cut too short so they used the green dominos to add more lenght, it's also there on earth wire coming out the wall and phase. again not illegal but shoddy work
I find that a bit strange. Not only that you shouldn't use a cable connector like this because they just start to burn out, but also that 2 neutral conductors come together at this point
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