IEC 60335-2-26:2024 EXV包含国际标准及其扩展版本(EXV)。IEC官方标准的扩展版本仅提供英文版本，为用户提供了标准的全面内容。IEC 60335-2-26:2024 EXV包括参考IEC 60335-1:20 20的内容。 IEC 60335-2-26:2024涉及额定电压不超过250 V的电钟的安全性，包括直流(DC)供电的电器和电池供电的电器。 本标准范围内的器具的例子有 -闹钟； -具有电动上弦机构的弹簧驱动时钟； -包括除电机以外的驱动装置的时钟。 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。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 -专供工业用途的器具； -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气氛（灰尘、蒸汽或气体）； -具有其他功能的时钟，无论是否与时间指示相结合，例如用于烹饪炉灶、洗衣机和类似器具的主控时钟和计时器； -用于“计时”的时钟-在“目的； -仅包含电子电路的时钟（IEC 60065、IEC 62368-1）； -手表。 本第五版取消并取代了2002年出版的第四版和修正案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)符合IEC 60335-1:20 20； b)将一些注释转换为规范性文本（第1条）； c)测试探针19(8.1.1、20.2、B.22.3、B.22.4)的应用； d)引入对外部可接近表面温升的限制（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 60335-2-26:2024 EXV contains both the international standard and its extended version (EXV). This extended version of the official IEC Standard is available in English only and provides the user with a comprehensive content of the Standard. IEC 60335-2-26:2024 EXV includes the content of the references made to IEC 60335-1:2020.

IEC 60335-2-26:2024 deals with the safety of electric clocks having a rated voltage not more than 250 V including direct current (DC) supplied appliances and battery-operated appliances.
Examples of appliances that are within the scope of this standard are
– alarm clocks;
– spring-driven clocks with an electrically operated winding mechanism;
– clocks incorporating driving means other than motors.
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.
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
– 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);
– clocks having other functions, whether or not in combination with time indication, such as master control clocks and timers for cooking ranges, washing machines and similar appliances;
– clocks for "clocking-in" purposes;
– clocks incorporating electronic circuits only (IEC 60065, IEC 62368-1);
– watches.
This fifth edition cancels and replaces the fourth 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) alignment with IEC 60335-1:2020;
b) conversion of some notes to normative text (Clause 1);
c) application of test probe 19 (8.1.1, 20.2, B.22.3, B.22.4);
d) introduction of limits on the temperature rise of external accessible surfaces (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.