Part 4.3, Division 6, clauses 56-61of the OHS Regulation 2001 is about working at heights.

The employer must ensure that all risks associated with falls from a height are controlled. To control risks, the employer must provide and maintain the following measures:

• stable and securely fenced work platform or, if this is not reasonably practicable
• secure perimeter screens, fencing, handrails or other physical barriers capable of preventing falls or, if this is not reasonably practicable
• other forms of physical restraint that are capable of arresting a fall from a height of more than two metres or, if this is not reasonably practicable 
• provision of a safe means of movement between different levels at the place of work.

The Regulation discusses provision and maintenance of physical restraints that are capable of arresting the fall of a person from a height of more than two metres. But this is only if it is not reasonably practical to provide control measures such as scaffold, perimeter screens, fencing or handrails.