What does 'Plumb Hoistway' describe in lift systems?

• A. Height of the hoist motor
• B. Width of the shaft
• C. Depth of the pit
• D. Space occupied by lift's travel path

Answer: (D)

Plumb hoistway means the shaft is true vertical, so the inside space where the car travels is proper and aligned. When the hoistway is plumb, the travel path—the vertical space the car and counterweight move through—fits precisely within the shaft boundaries, which also helps ensure door and landing alignment and proper clearance.

That’s why describing the space occupied by the lift’s travel path is the best match: it captures the idea that the hoistway defines the travel space the car must move within, and keeping that shaft vertical ensures reliable, safe operation. The other options refer to different dimensions or components (motor height, shaft width, pit depth) that aren’t what “plumb hoistway” is describing.