When is it critical to review and update the fire safety plan for a construction site?

The necessity to review and update the fire safety plan for a construction site is paramount when changes in site layout or processes occur. This is because the fire safety plan is designed to address the specific conditions and risks present at any given time during construction. Each alteration in the construction process, whether it's the relocation of equipment, changes to the building structure, or the introduction of new materials and activities, can significantly impact fire risks and safety protocols.

Updating the fire safety plan ensures that it reflects the current situation, allowing for appropriate measures to be taken to mitigate fire hazards effectively. When these changes happen, only an updated plan can provide guidance on evacuation routes, fire suppression measures, and the responsibilities of personnel in the event of a fire. Failing to update the plan could lead to gaps in safety measures, increasing the likelihood of fire incidents on site.

The other options, while they may have relevance in the context of construction safety, do not reflect the immediate need to adapt the fire safety plan to the evolving dynamics and risks of the construction environment.