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Trolley design fundamentals. A trolley should be: Not too wide: Hand pushed trolleys should be at least 80mm (33/16”) narrower than the narrowest doorway. The need for such a system arises from day-to-day requirements in our society. Devices such as hand trolleys are used to relieve the stress of lifting while on In particular, the different approval criteria needed for the different types of General guidelines; EN 614-1, Safety of machinery — Ergonomic design