What does the S-60 Certificate of Fitness holder need to ensure about their emergency phone?

A holder of the S-60 Certificate of Fitness needs to ensure that their emergency phone's battery lasts the entire shift if it is wireless. This is crucial because in case of emergencies, swift communication can be vital for safety and responding to incidents effectively. A phone that can sustain its charge throughout the work shift ensures that help can be immediately summoned if needed, thus enhancing the safety protocols at construction sites.

Other options do not align with the primary need for consistent and reliable communication in emergencies. For example, while a landline phone can be reliable, it may not be feasible in all construction settings due to accessibility or installation challenges. Likewise, phones that accept coins are outdated and impractical in modern emergency response scenarios, and being located inside a building could hinder quick access in certain situations. Therefore, the focus should be on the functionality and reliability of the emergency phone's power supply during the work shift.