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Bi-parting freight doors are designed to match the capacity and class of loading of the freight elevator as required by Section 2.11.12.4.2 ASME 17A.1-2000. The minimum rated load for bi-parting freight doors is based on the weight and class of the load to be handled, but in no case less than the minimums specified in Section 2.16.2 ASME 17A.1-2000. General explanations of the classes of loading are as follows:

Class A: General Freight Loading. Where (1) the load is distributed, (2) the weight of any single piece of freight or of any single hand truck and its load is not more than 25% of the rated load of the elevator, and (3) the load is handled on and off the car platform manually or by means of hand trucks.

Class B: Motor Vehicle Loading. Where the elevator is used solely to carry automobile trucks or passenger automobiles up to the rated capacity of the elevator.

Class C-1: Industrial Truck Loading. Where (1) the industrial truck travels with the load and (2) the static load (including the industrial truck) during loading and unloading does not exceed the capacity of the elevator.

Class C-2: Industrial Truck Loading. Where (1) the industrial truck does not travel with the load and (2) the static load (including the industrial truck) during loading and unloading is permitted to exceed the rated load. However, the maximum load during loading and unloading cannot exceed 150% of the rated load.

 
                   
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