An employer shall -
(a) for the purpose of preventing and providing protection against explosions, take technical and organisational measures that are appropriate to the nature of the operation and in order of priority ensure that those measures -
(i) either
(I) prevent the formation of explosive atmospheres, or
(II) where the nature of the activity does not allow that, avoid the ignition of explosive atmospheres including by electrostatic discharges where persons at work or the working environment act as charge carrier or charge producer, and
(ii) mitigate the detrimental effects of an explosion so as to ensure the health and safety of persons at work,
(b) where necessary, combine and supplement the measures referred to in paragraph (a with measures against the propagation of explosion,
(c) review the foregoing measures regularly and whenever significant changes occur,
(d) take the necessary measures, in compliance with Regulation 169, to ensure that -
(i) where explosive atmospheres
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