What is the maximum gap allowed between the unprotected edge and the working face?

The maximum gap allowed between the unprotected edge and the working face is specified as 225mm in Australian scaffolding regulations. This measurement is critical for ensuring the safety of workers at height, as it helps to minimize the risk of falls from edges while allowing for the necessary operational space for scaffolding and construction activities.

Adhering to this standard means that workers can operate close to edges without an increased risk of falling, as the distance is designed to provide a sufficient buffer zone. This regulatory guidance is based on safety assessments and best practices within the industry, where limiting the gap is essential for maintaining a safe working environment.

In considering the other options, they either exceed or do not meet the regulatory requirements necessary for safety, which is why they are not suitable choices in this context.