The interior of every building or room used for storage of explosives and the benches, shelves and fittings in such building or room shall be so constructed or so lined or covered as to prevent the exposure of any iron or steel and the detachment of any grit, iron, steel or similar substance so as to come into contact with explosive in such building and such interior benches, shelves and fittings shall, so far as is reasonably practicable, be kept clean and free from grit.
(1) A cemented trough at least fifteen centimetres deep shall be provided near each entrance of a magazine or storehouse. Such trough shall be kept filled with clean water and no person shall enter the magazine or storehouse without dipping overshoes or feet in such a trough so as to remove any grit or dust.
(2) Oiled cotton, oiled rags or oiled waste or any articles liable to spontaneous ignition shall not be taken into any magazine or storehouse used for storage of explosives.
(3) Before repairs are done to any magazine or storehouse or part thereof used for storage of explosives, that magazine or storehouse or part thereof shall be cleaned by removal of all explosives and by thorough washing.