An electrician from the shield connected the ground to the zero bus - what did he do?
Hello. I spend an electrician in a private house. The shield is mounted on a post near the house. From the pole comes 2 wires: phase and zero to the bipolar machine. From it, the electrician started up the meter, and also connected the zero at the meter with a wire to the ground on the shield. Then, from the counter, I brought the phase to a single-pole circuit breaker, and zero to the zero bus. And also connected the earth from the shield to this bus. Those. he connected the earth from the shield to the counter zero and the zero bus. Tell me what did he do? Does it get grounded zero? If I want to make the earth for myself, can I do it separately now, or can I connect to it?
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Yes, he grounded zero. Is the shield also grounded, is there an earthing switch dug under it, or else? You can do a zero separation in this case and switch to the TN-C-S system, but it is better to consult an electrician first. I also recommend reading the article: https://our.electricianexp.com/en/kak-razdelit-pen-provodnik-soglasno-pue.html.