Each incident occurring at work or arising out of or in connection with the activities of persons at work, or in connection with the use of plant or machinery, in which, or in consequence of which-
(a) any person dies, becomes unconscious, suffers the loss of a limb or part of a limb or is otherwise injured or becomes ill to such a degree that he is likely either to die or to suffer a permanent physical defect or likely to be unable for a period of at least 14 days either to work or to continue with the activity for which he was employed or is usually employed;
(b) a major incident occurred; or
(c) the health or safety of any person was endangered and where-
(i) a dangerous substance was spilled;
(ii) the uncontrolled release of any substance under pressure took place;
(iii) machinery or any part thereof fractured or failed resulting in flying, falling or uncontrolled moving objects; or
(iv) machinery ran out of control,
shall, within the prescribed period and in the prescribed manner, be reported to an inspector by the employer or the user of the plant or machinery concerned, as the case may be.