Here are the concise steps for verification: 1. Confirm the crane’s parameters: Find the rated load (WLL), lifting height, and the original chain specifications on the crane’s nameplate or in its manual. 2. Verify the chain standard and model: Ensure that the new chain complies with EN 818-7 / GB/T 20947. 3. Check the dimensions: The nominal diameter (d) and pitch (p) of the new chain must match the original specifications. 4. Determine the required length: Calculate the necessary length based on the lifting height, the number of chains used, and the structure of the crane. 5. Do not use incompatible chains: It is absolutely forbidden to replace the chains in an electric crane with ordinary lifting chains, even if their diameters appear to be the same.