家用和类似用途电器.安全.第2-21部分:储水式热水器的特殊要求

[中文适用范围]： IEC 60335-2-21 涉及用于家庭和类似目的的电动储水式热水器的安全，旨在加热低于沸点的热水，其额定电压对于单相电器不超过 250 V，对于包括直流（DC）供电电器和电池供电电器在内的其他电器不超过 480 V。本标准还涉及：不打算用于正常家庭用途但可能向公众造成危险的电器，例如打算由普通人在商店和农场使用的电器；旨在改装到具有改装设施的换热式密闭热水器中的浸没式加热器单元（另见附件 AA）。只要可行，本标准涉及在家庭内外所有人员所面临的由电器引起的常见危险。然而，一般情况下，它不考虑因身体、感官或精神能力、缺乏经验和知识而无法在监督或指导下安全使用电器的人员（包括儿童）；以及玩耍电器的儿童。 [外文原描述]： IEC 60335-2-21:2022 deals with the safety of electric storage water heaters for household and similar purposes and intended for heating water below boiling temperature, their rated voltage being not more than 250 V for single-phase appliances and 480 V for other appliances including direct current (DC) supplied appliances and battery-operated appliances. This standard also deals with: – appliances not intended for normal household use, but which nevertheless possibly pose a source of danger to the public, such as appliances intended to be used by laymen in shops and on farms; – immersion heater units intended to be retrofitted in a heat exchange closed water heater having provision for retrofitting. Additional requirements are given in Annex AA. 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 and similar authorities; – in many countries regulations exist for the installation of equipment connected to the water mains. This standard does not apply to – appliances for boiling water (IEC 60335-2-15); – instantaneous water heaters (IEC 60335-2-35); – commercial dispensing appliances and vending machines (IEC 60335-2-75); – 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). This seventh edition cancels and replaces the sixth edition published in 2012 and Amendment 1:2018. 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, 5.2, 15.3, 19.1, 19.2, 19.3, 19.4, 22.47, 22.104, 22.110, Annex AA introduction); c) updated requirement restricting use of appliance inlets (25.1). This part 2 is to be used in conjunction with the latest edition of IEC 60335-1 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.