Title: +038=627.001-##001T_03-Fasadevasksystem NorAcon - International Code of Practice (ICOP).pdf
Rescue should only be carried out by lowering or lifting the casualty, i.e. the F.3.4.18 counterweight anchor should not be called upon to support the mass of two persons or more, unless this has been addressed at the design and assembly stage, e.g. see F.3.3.8.F.3.5 Natural anchors (e.g. trees, rock)F.3.5.1 There is no simple formula for assessing the strength of natural anchors. Use of these types of anchor relies on the experience of users and, sometimes, assessment by an engineer and/or other specialists. The selection of suitable natural anchors, such as trees, see Figure F.11, or rock features, e.g. spikes or bollards, see Figure F.12, for the placement of anchor slings requires a large amount of judgement, particularly in terms of their stability.