what is the legislated hieght when fall protection is requried in Alberta?

In Alberta, fall protection is required when a worker may fall a vertical distance of 3 meters or more at a temporary or permanent work area [1]. Fall protection is also required if a worker may fall a vertical distance of less than 3 meters if there is an unusual possibility of injury, or if a worker may fall into or onto a hazardous substance or object, or through an opening in a work surface [1]. At a permanent work area, fall protection is required if a worker may fall a vertical distance of more than 1.2 meters and less than 3 meters [1].