If there is a project now, should the construction unit consult the supplier's price before bidding or consult the supplier after winning the bid?

This needs specific analysis. If the projects of State Grid Corporation are basically purchased by the construction unit after winning the bid, then some of them are purchased by the owner and some are purchased by the construction unit. If it is Nandian, the construction unit will be required to contact the supplier when bidding; Depending on what you produce, you should pay close attention to national engineering construction and collect useful information in time.