This document applies to the design of mobile access and working towers made of prefabricated elements with dimensions which are fixed by the design and with a height up to 12 m (indoors) and up to 8 m (outdoors). This document applies to mobile access and working towers used as temporary work equipment. This document: gives guidelines for the choice of the main dimensions and stabilizing methods, gives safety and performance requirements; and gives information on complete towers. This product standard does not apply to scaffolds according to EN 12810-1 and EN 12811-1.