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Guide to Scaffold Load Ratings and Capacity Limits A scaffold is rated for a load, and the rating is not the same as the weight of the crew. Planks, tools, material and the workers all count against the same number, and a bay that held four men yesterday is a different proposition with a pallet of block on the deck. Getting this right is the difference between a working platform and an overloaded one. The Three Duty Classes Scaffolds are built and rated in three working classes: light duty at 2 …