6.—(1) Any of the following incidents involving explosives—
(a)the unintentional explosion or ignition of explosives other than one—
(i)caused by the unintentional discharge of a weapon where, apart from that unintentional discharge, the weapon and explosives functioned as they were designed to do; or
(ii)where a fail-safe device or safe system of work functioned so as to prevent any person from being injured in consequence of the explosion or ignition;
(b)a misfire (other than one at a mine or quarry or inside a well or one involving a weapon) except where a fail-safe device or safe system of work functioned so as to prevent any person from being endangered in consequence of the misfire;
(c)the failure of the shots in any demolition operation to cause the intended extent of collapse or direction of fall of a building or structure;
(d)the projection of material (other than at a quarry) beyond the boundary of the site on which the explosives are being used or beyond the danger zone in circumstances such that any person was or might have been injured thereby;
(e)any injury to a person (other than at a mine or quarry or one otherwise notifiable or reportable under these Regulations) involving first-aid or medical treatment resulting from the explosion or discharge of any explosives or detonator.
(2) In this paragraph “explosives” means any explosive of a type which would, were it being transported, be assigned to Class 1 within the meaning of the Classification and Labelling of Explosives Regulations (Northern Ireland) 1991(1) and “danger zone” means the area from which persons have been excluded or forbidden to enter to avoid being endangered by any explosion or ignition of explosives.