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When working within the “danger zone – ER”, normally the electrical system will be isolated. Isolation is planned beforehand through an overhead line permit.

Through the safety instructions preceding the activities, you will have been briefed about the overhead line permit and the isolation. The “danger zone – ER” can only be safely entered after the electrical system has been switched off, proved (whether this is actually the case), earthing wires are attached by safety personnel and you have been given permission by the safety personnel.