Y-H Series are totally-enclosed, fan-cooled, three-phase marine service motors of squirrel-cage type. The motors are suitable for driving various machinery on ships, such as pumps, blowers, separators, hydraulic engines and other auxiliary equipments. Y-H series is a design variation of the brand-new Y series developed recently with the features of higher efficiency and large starting torque. The motors are designed in accordance with the National Standard GB 755-87 "the Fundamental Technical Requirements of the Electrical machinery" and Regulations for the Construction of Sea-going Steel Ships" The motors also comply with the relevant requirements of the following standards and specifications. IEC34 Rotating electrical machinery IEC72(1972) Dimensions and output rating for rotating electrical machinery IEC92 Electrical installation on ships IEC68 Basic environmental testing procedures The motor are also in conformity with the rules of the following Ships Classification Societies. LR Lloyd's Register of Shipping GL Germanischer Lloyd NK Nippon Kaiji Kyokai.