Schedule 4

FOURTH SCHEDULESections 7 and 51.Classes of dangerous occurrences

1. Bursting of a revolving vessel, wheel, grindstone or grinding wheel moved by mechanical power.

2. Collapse or failure of a crane, derrick, winch, hoist, piling frame, or other appliance used in raising or lowering persons or goods, or any part thereof (except breakage of chain or rope slings), or the overturning of a crane.

3. Explosion or fire causing damage to the structure of any room or place in which persons are employed, or to any machine or plant contained therein, and resulting in the complete suspension of ordinary work in the room or place or stoppage of machinery or plant for not less than 5 hours, where the explosion or fire is due to the ignition of dust, gas or vapour, or the ignition of celluloid or substance composed wholly or in part of celluloid.

4. Electrical short circuit or failure of electrical machinery, plant or apparatus, attended by explosion or fire or causing structural damage thereto, and involving its stoppage or disuse for not less than 5 hours.

5. Explosion or fire affecting any room in which persons are employed and causing complete suspension of ordinary work therein for not less than 24 hours.

6. Explosion or failure of structure of a steam boiler, or of a cast-iron vulcaniser, or of a receiver or container used for the storage at a pressure greater than atmospheric pressure of any gas or gases (including air) or any liquid or solid resulting from the compression of gas.