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Why is a rack and pinion elevator system able to carry freight when a traction cable system is prohibited from carrying any freight?

April 26, 2017able cable carry elevator freight pinion Prohibited rack system traction

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Why is a rack and pinion elevator system able to carry freight when a traction cable system is prohibited from carrying any freight?

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Traction cable elevators rely on the traction drive wheels to maintain friction with the cables. Over time, these wheels wear and friction is reduced, allowing the cables to slip on the traction wheel. Rack and Pinion systems cannot slip and are inherently safer. The Code recognizes this and allows Rack and Pinion systems to be used for freight and personnel.