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Occupational Health and Safety Regulation 2001
Repealed version for 7 June 2011 to 31 December 2011 (accessed 1 March 2019 at 08:55)
66   Definitions
In this Division:
confined space, in relation to a place of work, means an enclosed or partially enclosed space that:
(a)  is not intended or designed primarily as a place of work, and
(b)  is at atmospheric pressure while persons are in it, and
(c)  may have an atmosphere with potentially harmful contaminants, an unsafe level of oxygen or stored substances that may cause engulfment, and
(d)  may (but need not) have restricted means of entry and exit.
Examples of confined spaces are as follows:
(a)  storage tanks, tank cars, process vessels, boilers, pressure vessels, silos and other tank-like compartments,
(b)  open-topped spaces such as pits or degreasers,
(c)  pipes, sewers, shafts, ducts and similar structures,
(d)  shipboard spaces entered through a small hatchway or access point, cargo tanks, cellular double bottom tanks, duct keels, ballast and oil tanks and void spaces (but not including dry cargo holds).
safe oxygen level means a minimum oxygen content in air of 19.5% by volume under normal atmospheric pressure and a maximum oxygen content in air of 23.5% by volume under normal atmospheric pressure.