家用及类似用途电器 安全 第2-73部分：固定浸入式加热器的特殊要求

[中文适用范围]： 本部分IEC 60335涉及家用和类似用途固定式电浸入式加热器的安全性，这些加热器设计用于安装在与大气相通的水箱中，将水加热至沸点以下温度，额定电压不超过250V（单相电器）和480V（其他电器，包括直流供电电器）。 注101：水箱可以有其他加热水的方式，例如从独立锅炉循环热水。 额定输入功率不超过25kW的浸入式加热器，作为中央供暖锅炉的替代热源，也在本标准的范围内。 不适用于一般家用但可能对公众构成危险的电器，如商店、轻工业和农场中由非专业人员使用的电器，也在本标准的范围内。 本标准尽可能涵盖了家用电器常见的危险情况。然而，通常不考虑以下情况： - 无法在没有监督或指导的情况下安全使用电器的人员（包括儿童），因其身体、感官或智力能力不足，或缺乏经验和知识； - 儿童玩耍电器。 需注意以下事实： - 用于车辆、船舶或飞机上的电器可能需要额外要求； - 许多国家的国家卫生部门、劳动保护部门、国家供水部门等可能规定了额外要求。 本标准不适用于： - 专为工业用途设计的电器； - 用于特殊环境（如腐蚀性或爆炸性环境）的电器； - 集成在以下电器中的加热元件： • 液体加热电器（IEC 60335-2-15）； • 储水式热水器（IEC 60335-2-21）； • 即热式热水器（IEC 60335-2-35）； • 水族箱加热器（IEC 60335-2-55）； - 便携式浸入式加热器（IEC 60335-2-74）； - 发动机预热器（如汽车和巴士用）。 [外文原描述]： IEC 60335-2-73:2024 deals with the safety of fixed electric immersion heaters for household and similar purposes that are intended for installation in a water tank open to the atmosphere for heating water to a temperature below its boiling point with a rated voltage of not more than 250 V for single-phase appliances and 480 V for other appliances including direct current (DC) supplied appliances. The water tank can have alternative means for heating water, such as the circulation of hot water supplied from a separate boiler. Immersion heaters having a rated power input up to 25 kW for incorporation as an alternative heating source in central heating boilers are also within the scope of this standard. Appliances not intended for normal household use but which nevertheless can be a source of danger to the public, such as appliances intended to be used by laypersons in shops, in light industry and on farms, are within the scope of this standard. As far as is practicable, this standard deals with the common hazards presented by appliances that are encountered by all persons in and around the home. However, in general, it does not take into account: - persons (including children) whose physical, sensory or mental capabilities; or lack of experience and knowledge prevents them from using the appliance safely without supervision or instruction; - children playing with the appliance. Attention is drawn to the fact that - for appliances intended to be used in vehicles or on board ships or aircraft, additional requirements can be necessary; - in many countries additional requirements are specified by the national health authorities, the national authorities responsible for the protection of labour, the national water supply authorities and similar authorities. This standard does not apply to appliances intended exclusively for industrial purposes; - appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour or gas); - heating elements incorporated in appliances such as appliances for heating liquids (IEC 60335-2-15), storage water heaters (IEC 60335-2-21) and instantaneous water heaters (IEC 60335-2-35); - aquarium heaters (IEC 60335-2-55); - portable immersion heaters (IEC 60335-2-74); - engine preheaters such as those for cars and buses. This third edition cancels and replaces the second edition published in 2002, Amendment 1: 2006 and Amendment 2: 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) the text has been aligned with IEC 60335-1:2020; b) some notes have been converted to normative text (Clause 1, 19.2); c) addition of external accessible surface temperatures (Clause 11); This part 2 is to be used in conjunction with the latest edition of IEC 60335-1:2020 and its amendments unless that edition precludes it; in that case, the latest edition that does not preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.