Which of the following is a potential source of injury that requires lockout and tagout procedures?

Lockout and tagout procedures are essential safety protocols used to prevent the unexpected startup of machinery and equipment during maintenance or servicing. The primary purpose of these procedures is to protect workers from the dangers associated with equipment that could inadvertently activate while they are working on or near it.

Unexpected startup poses a significant risk because it can occur due to various reasons, such as equipment malfunctions or improper maintenance practices. If machinery is not securely locked out and tagged, workers may be exposed to moving parts, electrical hazards, and other life-threatening situations. Implementing lockout/tagout ensures that workers can perform their tasks safely, knowing that the equipment is unable to start unintentionally.

Other options, while they may be factors to consider in workplace safety, do not directly relate to the specific and critical need for lockout and tagout procedures in preventing injury from unexpected operation of machinery.