What does the CBA specifically refer to regarding necessary supervision for apprentices?

The correct answer emphasizes that direct supervision is mandatory when apprentices are working on secondary voltage, which is crucial for safety and skill development in this specific area. Secondary voltage work can present significant risks, and having a qualified supervisor on hand ensures that the apprentice receives the guidance and oversight necessary to perform tasks safely and correctly. This requirement reflects the emphasis on maintaining high safety standards in accordance with industry regulations and practices, as apprentices may not yet have the experience to identify and mitigate all potential hazards associated with secondary voltage work.

The requirement for direct supervision also ensures that apprentices can receive immediate feedback and instruction, which is essential for their professional growth and competency in handling sensitive electrical systems.