主要用于室内使用的轮椅的外形尺寸限制是为了机动车辆、电梯、厨房设备等具有良好的可操作性和可接近性而制定的。该限制适用于手动轮椅和电动轮椅，并涵盖85%的残疾人使用的轮椅。

The limits of overall dimensions of wheelchairs primarily intended for indoor use are laid down with the purpose of a good manoeuvrability and accessibility of motor vehicles, lifts, kitchen equipment etc. It applies to manual as well as electric wheelchairs in their operational condition, and covers wheelchairs usable by 85 per cent of disabled people.