Confined Space 17
Confined Space 17 : 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. These include loss of consciousness due to rise of body heat or asphyxiation, drowning due to rising liquid level or free flowing solid, serious injury arising from fire or explosion, or entrapment preventing escape: (Confined Space Regulations)