85. (1) An employer shall ensure that—

(a) subject to paragraph (2), where necessary to prevent danger, suitable means (including, where appropriate, methods of identifying circuits) are available to switch off the supply of electricity to any electrical equipment and to isolate any electrical equipment,

(b) every switch, circuit breaker or other control device provided under subparagraph (a) is, where necessary to prevent danger,

(i) clearly marked to indicate the “ON” and “OFF” positions, unless these are otherwise self-evident, and

(ii) readily accessible for authorised persons and in a suitable and adequately lit location, and

(c) adequate precautions are taken to prevent the operation of any switch while carrying current where that switch is not capable of safely interrupting normal load current.

(2) Paragraph (1) does not apply to electrical equipment which is itself a source of electrical energy, provided that adequate precautions are taken to prevent danger.