This application allows to verify the conditions of safe use of stepladders for professional use. Including hand stairs are a stretch and support extensible and scissor or self-stable, as shown in the series of technical standards UNE-EN 131. They are outside the scope of the stairs made of insulating material for electrical work, according to the UNE-EN 61478. Before doing work on a manual height ladder should be assessed risks of the job and whether there are other means of access and permanen