Regulation 12 Means for cutting off the supply and for isolationI1
England, Wales and Scotland
Subject to paragraph (3), where necessary to prevent danger, suitable means (including, where appropriate, methods of identifying circuits) shall be available for–
cutting off the supply of electrical energy to any electrical equipment; and
the isolation of any electrical equipment.
In paragraph (1), “isolation” means the disconnection and separation of the electrical equipment from every source of electrical energy in such a way that this disconnection and separation is secure.
Paragraph (1) shall not apply to electrical equipment which is itself a source of electrical energy but, in such a case as is necessary, precautions shall be taken to prevent, so far as is reasonably practicable, danger.