This standard specifies the terms and definitions, product classification, technical requirements, test methods, inspection rules and markings, packaging, transportation, and storage requirements of silicon nitride electric heating elements (hereinafter referred to as electric heating elements) for household and similar electric heating appliances. This standard applies to electric heating elements with an AC/DC working voltage not exceeding 480V. This standard is applicable to situations where the surrounding environment is free of flammable, explosive, and conductive dust, and there is no obvious mechanical impact. 2 Normative References: The clauses in the following documents become clauses of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GB 2900.29-1984 Electrotechnical Terminology - Household Electrical Appliances GB 4706.1-1998- Safety of Household and Similar Electrical Appliances - Part 1: General Requirements (eqv IEC60335-1) G4706.12-1995- Safety of Household and Similar Electrical Appliances - Special Requirements for Storage Electric Water Heaters (idt IEC60335-2-21) GBT 6569-1986 Engineering Ceramics - Bending Strength Test Methods - Terminology and Definitions - Established in GB 2900.29 and GB 4706.1, and the following terms and definitions apply to this standard. Silicon nitride ceramic heating element is an electric heating element that uses silicon nitride ceramic as the substrate, silicon nitride ceramic as the insulation medium, and alloy electric heating wire as the heat source. Heating length is the length of the heating part on the electric heating element. Bending strength The maximum stress of the rectangular section specimen cut from the electric heating element under the action of bending stress when the specimen is subject to Lamian Noodles fracture. Simulating conditions: Under the conditions specified in each chapter of this standard, some measures are taken to ensure that the average temperature value on the surface of the electric heating element is basically consistent with the working temperature
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