A plumber is required to inspect a large, underground storm drain culvert that is 900 mm in diameter and known to have limited ventilation. Before entry, what must be the primary consideration?

Question: A plumber is required to inspect a large, underground storm drain culvert that is 900 mm in diameter and known to have limited ventilation. Before entry, what must be the primary consideration?

Answer options:

• Ensuring proper lighting is available inside the culvert. ✅ Verifying the presence of an emergency rescue plan and standby person.
• Checking for potential wildlife hazards within the culvert.
• Confirming the culvert has adequate space for the plumber to move comfortably.

Correct answer: Verifying the presence of an emergency rescue plan and standby person.

Explanation: Any confined space entry, such as a storm drain culvert, requires a robust confined space entry program which includes a written emergency rescue plan and the presence of a trained standby person outside the space to monitor the entrant and initiate rescue if necessary. While other factors like lighting and space are important for work efficiency, they are not the primary safety consideration for confined space entry.