confined spacemeans any place, including any chamber, tank, vat, silo, pit, trench, pipe, sewer, flue, well or other similar space in which, by virtue of its enclosed nature, there arises a reasonably foreseeable specified risk;
diving projecthas the meaning assigned thereto by regulation 2(1) of the Diving at Work Regulations 1997;
free flowing solidmeans any substance consisting of solid particles and which is of, or is capable of being in, a flowing or running consistency, and includes flour, grain, sugar, sand or other similar material;
minehas the meaning assigned thereto by section 180 of the Mines and Quarries Act 1954;
specified riskmeans a risk of— (a) serious injury to any person at work arising from a fire or explosion;
system of workincludes the provision of suitable equipment which is in good working order.