What level of staging is used for second or greater box alarms or when mutual aid units arrive at an incident?

Level 2 staging is specifically designed for situations involving second or greater box alarms or when mutual aid units arrive at an incident. This level of staging is necessary because it allows for an organized and efficient response to larger incidents where multiple units and resources are needed.

In Level 2 staging, units are positioned at a designated staging area away from the immediate scene. This ensures that responding units can be managed effectively, directing them to where they are needed without congestion at the front lines. It allows for a coordinated response, which is essential for safety, communication, and effective incident command.

Level 1 staging would typically be used for initial responses and may not accommodate the complexities involved in managing multiple incoming units. Levels beyond Level 2 would imply larger operations or further escalated incidents, which are not the focus when initially dealing with mutual aid responses or second alarms. Therefore, Level 2 is the appropriate choice for the described scenario.