Document ID: chunk:federal_register_of_legislation:F2024C01055:front:0:p24
Version: federal_register_of_legislation:F2024C01055
Segment Type: other
Provision Reference: 
Character Range: 59233–61960

of injury or illness arising from exposure to an identified hazard or identified hazards.
risk control means the process of managing the elimination or minimisation of the likelihood that a substance will cause harm to health in the circumstances of its use.
safe oxygen range means, under normal atmospheric pressure, a minimum oxygen content in the atmosphere of 19.5% by volume and a maximum oxygen content in the atmosphere of 23.5% by volume.
stand‑by person means a person who performs the role mentioned in regulation 4.19.
 (2) A person is taken to have entered a confined space if the person's head or upper body is within the boundary of the confined space.
Note: Inserting an arm into a confined space for the purpose of atmospheric testing or monitoring is not considered an entry into the confined space.

4.02  Explosive limit
  The LEL of a flammable contaminant is the concentration of the contaminant in air below which the propagation of a flame does not occur on contact with an ignition source.
Note: A flammable contaminant has a lower explosive limit (LEL) and an upper explosive limit (UEL). This Part refers only to lower explosive limits.

4.03  Exposure standard
 (1) The exposure standard for a substance means the airborne concentration of the substance in a person's breathing zone, as described in the HSIS.
 (2) The exposure standard may be expressed as:
 (a) time‑weighted average (TWA), which is the average airborne concentration of a particular substance calculated over a period of time; or
 (b) peak exposure limit, which is the maximum or peak airborne concentration of a particular substance that is determined over the shortest analytically practicable period of time that does not exceed 15 minutes; or
 (c) short‑term exposure limit, which is a 15 minute TWA exposure that should not be exceeded at any time during a work day even if the 8‑hour TWA for that work day is within the TWA exposure standard.
 (3) Exposure at the short‑term exposure limit must not be repeated more than 4 times in a day.
 (4) There must be at least 60 minutes between successive exposures at the short‑term exposure limit.
 (5) In this regulation:
8‑hour TWA means a TWA calculated over an 8‑hour work day for a 5‑day working week.

Division 2—Duties of operators

Subdivision 1—Securing confined spaces

4.04  Entry and exit points
 (1) The operator of a prescribed ship or prescribed unit must ensure that:
 (a) the entry points to a confined space are secured against unauthorised entry; and
 (b) if practicable—the entry points to the confined space are permanently sign posted.
Penalty: 10 penalty units.
 (2) The operator of a prescribed ship or prescribed unit must ensure that entry and exit points