This standard specifies the operation criteria and requirements for technical specification and inspection,delivery,installation,operation and maintenance of the electromechanical equipment of small hydroelectric stations. This standard is applicable to electromechanical equipment of hydroelectric installations with the installed capacity of no more than 50 MW. This standard deals only with the direct relations between the purchaser and the supplier regarding the electromechanical equipment.It does not deal with civil works,administrative conditions or commercial conditions.