IEC 60335-2-55:2021作为IEC 60335-2-55:2021 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 60335-2-55:2021涉及用于家用和类似用途的水族馆和花园池塘的电器的安全性，其额定电压不超过250 V，包括直流(DC)供电的电器和电池供电的电器。 本标准适用的设备示例有 -曝气器； -水族箱加热器； -自动食品分配器； -吸泥器具。 不打算用于正常家庭使用但可能对公众造成危险的电器，例如打算供商店、轻工业和农场中的外行人使用的电器，都在本标准的范围内。在可行的情况下，本标准涉及家庭内外所有人都会遇到的电器带来的常见危险。然而，一般来说，它没有考虑到 -身体、感官或精神能力受损的人（包括儿童）；或缺乏经验和知识使他们无法在没有监督或指导的情况下安全使用器具； -儿童在玩电器。 提请注意以下事实: -对于拟用于车辆或船舶或飞机上的器具，可能需要附加要求； -在许多国家，国家卫生当局、负责保护劳工的国家当局和类似当局规定了额外的要求。 本标准不适用于 -泵(IEC 60335-2-41)； -其他便携式浸入式加热器(IEC 60335-2-74)； -水族馆和花园池塘用灯具(IEC 60598-2-18)； -额定功率输入超过100W的户外使用电器； -专供专业人士使用的器具； -拟在有特殊条件的地方使用的器具，例如存在腐蚀性或爆炸性环境（灰尘、蒸汽或气体）。 这第四版取消并取代了2002年出版的第三版和修正案1:20 08。本版构成技术修订版。 与上一版相比，此版本包括以下重大技术变更: a)文本已与IEC 60335-1:20 20保持一致； b)一些注释已转换为规范性文本或删除（第1、5条）。2,19.101,21.1,21.102,22.101); c)更新浸没深度符号(7.1、7.6、7.12)； d)引入了对外部可触及表面温升的限制（条款11）。 本第2部分应与最新版本的IEC 60335-1及其修订一起使用，除非该版本排除了本第2部分；在这种情况下，使用不排除它的最新版本。它是在该标准第六版（2020年）的基础上建立的。

IEC 60335-2-55:2021 is available as IEC 60335-2-55:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60335-2-55:2021 deals with the safety of electric appliances for use with aquariums and garden ponds for household and similar purposes, their rated voltage being not more than 250 V, including direct current (DC) supplied appliances and battery-operated appliances.
Examples of appliances that this standard is applicable to are
- aerators;
- aquarium heaters;
- automatic food dispensers;
- sludge-suction appliances.
Appliances not intended for normal household use but that nevertheless can be a source of danger to the public, such as appliances intended to be used by laymen in shops and in light industry and 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 and similar authorities.
This standard does not apply to
- pumps (IEC 60335-2-41);
- other portable immersion heaters (IEC 60335-2-74);
- luminaires for aquariums and garden ponds (IEC 60598-2-18);
- appliances intended for outdoor use having a rated power input exceeding 100 W;
- appliances intended exclusively for professional use;
- 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 fourth edition cancels and replaces the third edition published in 2002 and Amendment 1:2008. 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 or deleted (Clause 1, 5.2, 19.101, 21.1, 21.102, 22.101);
c) updated the depth of immersion symbol (7.1, 7.6, 7.12);
d) limits on the temperature rise of external accessible surfaces have been introduced (Clause 11).
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.