For an enclosed vertical platform lift, what is the maximum permitted travel?

For an enclosed vertical platform lift, the maximum permitted travel is indeed 7,000 mm (280"). This specification is in accordance with safety standards and operational guidelines that ensure proper functioning and user safety.

The rationale for this maximum travel limit is to balance usability with the technical constraints of the lift's design, including structural integrity, mechanical capabilities, and safety regulations. Lifts designed to travel up to this height can accommodate most residential and commercial vertical mobility needs while ensuring that the systems in place for safety, such as emergency stops and mechanical brakes, are effective and reliable.

Additionally, exceeding this travel limit could introduce engineering challenges and potential safety risks, such as increased strain on structural components or difficulty in maintaining the lift. By setting a cap at 7,000 mm, regulatory bodies can ensure that the lift performs reliably under expected loads and conditions.

Meanwhile, the other options propose heights that surpass this standard, which are not permitted due to the reasons outlined above regarding safety and equipment limitations within the classifications for vertical platform lifts.