This part specifies the terminology for low-voltage electrical appliances, including general terms, product names, structures and components, design parameters and technical performance, and general working conditions and test requirements. This part applies to the formulation of low-voltage electrical products and their standards, the preparation of technical documents, the preparation and translation of professional manuals, teaching materials or books and periodicals, and is used by personnel engaged in the production, scientific research, use and teaching of electrical professional work. The terms specified in this part are coordinated with the relevant parts of GB/T 2900.1 "Basic Terms of Electrotechnical Terminology"; terms not specified in this part can be specified in relevant standards when necessary.