Which wire to use for grounding

Which wire to use for grounding

What section, brand and color should be the wire for grounding. Grounding conductor requirements. Features of connecting the ground wire.

How to lay the cable through the doorway?

How to lay the cable through the doorway?

Is it possible to lay the cable through the doorway along the box and how best to lay it in the voids hl in the corrugation or not in the concrete wall ?! The cable will be 3 * 2.5 NYM.

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