Abihaardevahendite projekteerimisel peab arvestama materjali väsimist ja vananemist ning töötsüklite arvu ettenähtud otstarbel kasutamisel nii ettenähtud kui oletatava kasutusaja jooksul.
1. The design of a machine ... begins with the determination of limits: ...
- time limits: determination of the foreseeable "life limit" of the machine, taking into account its intended use, and/or of some of its components (tools, wear parts, electrical components, etc.).
2. The aim of measures taken must be to eliminate any risk of accident throughout the foreseeable lifetime of the machinery, including the phases of assembly and dismantling, even where risks of accident arise from foreseeable abnormal situations.
