1. Een persoon in paniek kan de ladder versperren
2. Men kan de ladder niet gebruiken met een kind of gewonde op de rug
3. Moeilijk gebruik door brandweer met materiaal op de rug
• Wetenschappelijke studies geven aan dat de kooi weinig of geen reële bescherming biedt bij een val
Studie door de Health & Safety Executive UK over het nut van een kooi.
Titel van de studie: ”Preliminary investigation into the fall-arresting effectiveness of ladder safety hoops”
Uitgebreide studie met simulatietests, ongeval analyses en literatuurstudie
– After studying the information from the references, the survey, from the accident database and the results from testing, it seems clear that caged ladders cannot provide positive fall-arrest capability, especially in the case of the three-upright design which was tested as part of this research. There is every possibility of a fall down the cage to the ground or other platform.
– There would appear, or so it seems, a possibility to stop the fall of a worker in certain circumstances, but this depends upon the attitude of the worker both before the fall and during the fall, and whether or not the worker manages to catch part of his or her body in one of the cage apertures, or manages to trap themselves in the cage some other way. In any event, it is a chance occurrence, and the opinion is that even if the worker could be caught by the cage, it could lead to significant if not fatal injury.
– The accidents reviewed indicate that workers fall down cages to the next level and are rarely caught. Injuries have been reported. Even if a fall is halted by limb entanglement within a cage, rescue would be extremely difficult process to carry out successfully.
– No test methods were discovered in this research for testing the fall-arresting effectiveness of caged ladders, whereas there are a number of standards in existence for FAS (ladder-mounted fall-arrest system).
– Inferences from the documentation reviewed make it clear that caged ladders do not provide the same level of protection as ladder-mounted FAS, although a number indicate that the protection methods are on a par, but confuse the issues or use evasive language. The vast majority, when referring to protective measures, tend to avoid the subject completely by referring to FAS specifically in terms of their fall-arresting effectiveness, and then to caged ladders only in a general protective sense. The whole matter of caged ladder protection is often left vague.
Er is geen algemeen voorschrift (wet, norm) voor een kooi bij vluchtladders.