According to regulations, which of the following fall protection systems requires an inspection before use?

Safety nets require an inspection before use due to the essential role they play in fall protection. These systems are designed to catch workers who may fall from heights, and ensuring that they are in good condition is crucial for safety. Inspections help to identify any wear, damage, or failures that could compromise the net's ability to provide the necessary protection.

While guardrails, personal protective equipment, and warning signs are also important components of safety measures, their inspection protocols may differ. Guardrails do need to be maintained, but they typically undergo periodic inspections rather than a pre-use check. Personal protective equipment, such as harnesses or hard hats, is also subject to inspection but is governed by different standards regarding the timing and scope of those checks. Warning signs do not generally require inspections in the same manner, as they are fixed and not subject to the same wear and tear as dynamic systems like safety nets. Therefore, the regulation specifying that safety nets require an inspection before use is crucial for maintaining workplace safety standards.