Question: In circumstances where a person is ascending a vertical ladder, using a full body harness/twin tail lanyard fall arrest system and using the ladder rungs as anchor points, do the ladder rungs have to be rated the same as other designated anchor points in accordance with AS/NZS 1891.4 2009 Industrial fall-arrest systems and devices; selection, use and maintenance (i.e.: 12 Kn for limited free fall-arrest)?