What must be used to protect any chute opening where debris is dumped?

To address the need for safeguarding chute openings where debris is dumped, the proper protective measure is guardrails. Guardrails are designed to create a physical barrier that prevents accidental falls or debris from striking individuals in areas below or adjacent to the chute opening. They are an essential component in ensuring safety on construction sites, particularly where there is a risk of falling materials caused by the dumping of debris.

Utilizing guardrails not only provides physical protection but also helps to demarcate hazardous areas, making it clearer for workers where caution is necessary. This measure is pivotal in accident prevention strategies and is aligned with safety regulations that require effective barriers to protect workers and the public from potential hazards associated with construction activities.

Other options like netting may offer some level of protection but are not as effective as guardrails for this specific scenario. Fencing could be used in broader site safety strategies but does not specifically address the unique risks posed by chute openings in the same manner that guardrails do. Signage serves an important purpose in communicating hazards but does not provide physical protection. Therefore, guardrails are the appropriate choice for effectively safeguarding chute openings where debris is dumped.