Anyone maintaining, repairing or interfering in some way with electrical equipment needs to be competent. Broadly speaking levels of competence are defined according to voltage (i.e. someone competent on low voltage may not be competent to work on high voltage).
Ideally the electrical supply will be positively isolated before potentially live conductors are exposed. Special precautions are required where isolation is not possible or cannot be proved.
Permit-to-work systems are often used so that work cannot start until isolation has been achieved.
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