What is the required height range for retractable passenger restraining arms above the platform perimeter?

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Multiple Choice

What is the required height range for retractable passenger restraining arms above the platform perimeter?

Explanation:
The height is set to 800–1,000 mm above the platform perimeter. This places the retractable passenger restraining arm at a level that effectively covers the edge where a passenger is stepping onto or near the escalator, while still being within a comfortable reach for most adults. It also keeps the arm out of the way during boarding and maintenance and allows it to retract when not needed. If the arm were too low, it wouldn’t reliably restrain someone near the edge; if too high, it would be awkward to reach and could interfere with boarding or operations.

The height is set to 800–1,000 mm above the platform perimeter. This places the retractable passenger restraining arm at a level that effectively covers the edge where a passenger is stepping onto or near the escalator, while still being within a comfortable reach for most adults. It also keeps the arm out of the way during boarding and maintenance and allows it to retract when not needed. If the arm were too low, it wouldn’t reliably restrain someone near the edge; if too high, it would be awkward to reach and could interfere with boarding or operations.

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