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Canton - Freight Loading Classes
Freight elevator doors are designed to match the capacity and class of loading of the freight elevator.
ASME/ANSI A17.1 Code, Rule 1301.6 (latest revision) specifies door construction standards.
Calculations for stresses in the platform members (and doors) of freight elevators are based on the following concentrated loads assumed to occupy the position which will produce the maximum stress: (latest revision) specifies door construction standards.
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For Class A loading: 25% of the rated load.
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For Class B loading: 75% of the rated load divided into two equal parts, 5 ft. (1524mm) apart.
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For Class C1 loading: where the truck is carried by the elevator, with a load rating of 20,000 lbs. (9072 kg) or less: 80% of the rated load divided into two equal parts, 30 inches (762mm) apart.
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For Class C2 loading: where the truck is not usually carried by the elevator, with a load rating of 20,000 lbs. (9072 kg) or less: 80% of the rated load or of the loaded truck weight, whichever is greater, divided into two equal parts, 30 inches (762mm) apart.
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For Class C1 or C2 loading: with a rated load in excess of 20,000 lbs (9072 kg): 80% of 20,000 lbs. or of the maximum loaded truck weight, whichever is greater, divided into two equal parts, 30 inches (762mm) apart.
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For Class C3 loading: determined on the basis of actual loading conditions, but not less than that required for Class A loading.
