Due to the specific environmental conditions of the ships,the General electrical equipment cannot be used directly on board.I guarantee the safe navigation of ships States classification society to the technical requirements for marine electrical equipments and testing standards are defined,some important settings and installation of electrical equipment to comply with the provisions of the Internations Convention for the safety of life at sea .Therefore ,ship according to relevant provisions and requirements in the selection,installation and maintenance of electrical equipment,to highlight the consideration their reliability to prevent the occurrence of fire ,avoid personal electric shock injuries and other public questions.