How can Phase I operation be initiated?

Initiating Phase I operation can be done manually by operating a key-switch as it allows for direct control over the system by personnel on-site. This method is essential in situations requiring immediate action, where firefighters may need to override automated systems or operate them in a controlled manner.

While there may be alternative options like using a mobile app or a dispatch command for initiating other phases or operations, they may not be suitable for Phase I, which typically requires immediate manual intervention. Additionally, the sprinkler system's automatic activation serves a different function and is not the way to initiate Phase I but rather a response to a fire event. Therefore, the manual operation using a key-switch provides the necessary control and promptness required for Phase I situations in firefighting operations.