This part of ISO 7176 specifies requirements and test methods for electrically propelled stair-climbing devices and stair-climbing wheelchair carriers operated by an attendant. It also includes ergonomic, safety labelling and disclosure requirements. This part of ISO 7176 is applicable to stair-climbing devices for which the attendant walks directly behind the device and where the device is driven backwards when ascending stairs. NOTE This means that when ascending stairs the attendant walks backwards up the stairs, with the occupant facing downstairs. Descending stairs is performed forwards with the occupant facing downstairs.