Which of the following is a common precaution before starting torch operations?

Establishing a safety perimeter is a critical precaution before starting torch operations. The safety perimeter helps to create a controlled environment where the risks associated with the torch operation can be mitigated. It ensures that unauthorized personnel and potentially flammable materials are kept at a safe distance from the area where hot work is taking place. This perimeter can help prevent accidents and injuries by limiting access to the operational area, thereby protecting both workers and bystanders from potential hazards such as sparks, heat, and toxic fumes that may result from the operation.

In contrast, wearing sandals for comfort is not appropriate for safety-related tasks in torch operations, as proper personal protective equipment (PPE) like fire-resistant boots is necessary. Notifying management, while important, does not inherently protect against hazards or create a safer working environment. Lighting a warning flare may signal the presence of danger, but it does not take proactive measures to prevent accidents or control access to the area. Therefore, establishing a safety perimeter stands out as the correct and essential precaution to ensure both safety and compliance during torch operations.