(1) An employer shall -
(a) where an explosive atmosphere is or is likely to be present at or may, from time to time, arise in a workplace, make a suitable and appropriate assessment of the risk arising from such explosive atmosphere to the employees concerned having regard to all the circumstances,
(b) in carrying out the assessment referred to in paragraph (a), have regard to -
(i) the likelihood that explosive atmospheres will occur and their persistence,
(ii) the likelihood that ignition sources, including electrostatic discharges, will be present and become active and effective,
(iii) the installations, substances used, work processes and their possible interactions,
(iv) the scale of the anticipated effects,
(v) any places which are or can be connected via openings to places in which explosive atmospheres may occur, and
(vi) such additional safety information as the employer may need in order to complete the assessment;
(2) Having carried out an assessment under and in accordance
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