1) Get familiar with the drawings, learn the specifications and procedures, distinguish the construction scope, organize the joint review of drawings and design disclosure, read the product manual, and understand its performance. 2) Reasonably arrange personnel and prepare machines, tools and materials. 3) The model, specification, quantity and voltage grade of equipment and materials shall be checked when they are delivered out of the warehouse, the warehouse out account shall be established for verification, and management shall be carried out to prevent loss. four