Which of the following is NOT a requirement for safe trench entry?

The correct choice identifies that "no restrictions on entry" is not a requirement for safe trench entry. Safe practices dictate that entry into trenches should be highly controlled and regulated. There are often specific conditions under which workers may enter trenches, including but not limited to, ensuring they are properly shored, evaluating potential hazards, and following established safety protocols.

For example, proper shoring is essential to prevent collapses, as unsupported trench walls pose significant risks to workers inside. Additionally, having a rescue plan is vital in case of emergencies, ensuring that there is a systematic approach for rescuing someone in distress. Lastly, clear access to the trench is fundamental to facilitate quick entry and exit for workers, especially during emergencies or evacuations.

In the context of trench safety, restrictions are crucial to manage risks effectively, ensuring that only qualified personnel enter under specific, safe conditions. Thus, removing all restrictions on trench entry would contradict safety regulations and best practices.