I am not aware of the reasoning of the drafting committee but I think, in essence, prevention is supposed to be about a wide event rather than a localised problem and that is why you elevate it to the project as a whole rather than sections (if there are sections)
Clause 19 Prevention leads to an instruction and a CE under 60.1(19). The CE is not limited to impact on the whole of the works that is just what kicks off the process.I don't think it changes liability for LDs at all. I can't think of an example of an event that would prevent completion of the whole of the works but have no impact on the sections. If it did occur and there was no impact on the sections then liability for LDs will still arise. If it also impacted the sections that would be part of the CE evaluation.
Clause 19 Prevention leads to an instruction and a CE under 60.1(19). The CE is not limited to impact on the whole of the works that is just what kicks off the process.I don't think it changes liability for LDs at all. I can't think of an example of an event that would prevent completion of the whole of the works but have no impact on the sections. If it did occur and there was no impact on the sections then liability for LDs will still arise. If it also impacted the sections that would be part of the CE evaluation.