What information is required on the yellow periodic label?

The correct choice emphasizes the importance of tracking inspection intervals through the yellow periodic label. This label is vital in ensuring that the electrical installation is regularly assessed for safety and compliance with regulations. The inclusion of the date of the last inspection and the next scheduled inspection serves as a record that helps users verify that the installation is being maintained appropriately and that it meets safety standards.

Having both dates allows for easy reference and accountability. It encourages timely inspections and helps prevent potential hazards that could arise from overdue checks.

Meanwhile, the other choices, while they provide valuable information in context, do not directly pertain to the required content of the yellow periodic label. For instance, the type of installation and details of all circuits are relevant but not specifically mandated to be displayed on this label. Contact information for the inspector might also be useful, but it does not fulfill the essential purpose of tracking inspection history as indicated by the correct answer.