IEC 60335-2-49:2021作为IEC 60335-2-49:2021 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 60335-2-49:2021涉及用于保持食物和陶器温暖的电动商用电器的安全性，对于连接在一相和中性线之间的单相电器，其额定电压不超过250 V，对于其他电器，其额定电压不超过480 V。 本标准范围内的设备示例包括: -热橱柜，有或没有加热顶部； -加热上衣； -加热陈列柜； -加热的陶器分配器； -加热桌； -辐射加热器。 这些电器不用于家用和类似用途。它们用于商业目的、食品加工，也用于向公众开放的区域，例如餐馆、食堂、医院的厨房和商业企业，如面包店和肉店。利用其他形式能量的电器的电气部分也在本标准的范围内。 在可行的情况下，本标准涉及这些类型的器具带来的常见危害。 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、国家供水当局和类似当局规定了额外的要求； -在许多国家，对压力器具规定了额外的要求。 本标准不适用于: -专为工业用途而设计的器具； -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）；-连续大规模生产食品的器具； -商用电bains-marie(IEC 60335-2-50)； -电池供电的电器； -IEC 60335-2-12涵盖的家用加热板和类似器具，由外行人在以下环境中使用:商店、办公室和其他工作环境中的员工厨房区域、农舍、酒店、汽车旅馆和其他住宅类型环境、床和早餐类型环境。 本第五版取消并取代了2002年出版的第四版、修正案1:20 08和修正案2:20 17。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)引入对打算在向公众开放的区域使用的设备的要求，包括外部可触及表面温度（第1、7条）。12，11.8，表102)； c)排除电池供电的电器（第1条）； d)澄清外行使用的器具的适用标准（第1、7.12条）； e)将清洁说明从7.12.1重新定位到7.12； (f)将24.101迁至22.106； g)IEC 60335-2-49的文本与IEC/TC61/MT32下的其他标准的协调； h)一些注释被转换为规范性文本、修改或删除（第1、7.1、7.15、11.3、11.7、15.2、19.2、22.101、23.3条）； i)输入电流测量的附加要求； j)15.1.1中检测程序的澄清； k)20.1和23.3中试验条件的澄清； l)对25.3中要求的澄清。 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 60335-2-49:2021 is available as IEC 60335-2-49:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60335-2-49:2021 deals with the safety of electrically operated commercial appliances for keeping food and crockery warm, their rated voltage being not more than 250 V for single-phase appliances connected between one phase and neutral, and 480 V for other appliances.
Examples of appliances that are within the scope of this standard are:
– hot cupboards, with or without heated tops;
– heated tops;
– heated display cases;
– heated crockery dispensers;
– heated tables;
– radiant heaters.
These appliances are not intended for household and similar purposes. They are used for commercial purposes, processing of food, also in areas open to the public, for example in kitchens of restaurants, canteens, hospitals and in commercial enterprises, such as bakeries and butcheries.
The electrical part of appliances making use of other forms of energy is also within the scope of this standard.
As far as is practicable, this standard deals with the common hazards presented by these types of appliances.
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;
– in many countries, additional requirements are specified for pressure appliances.
This standard does not apply to:
– appliances designed 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);
– appliances for continuous mass production of food;
– commercial electric bains-marie (IEC 60335-2-50);
– battery-operated appliances;
– warming plates and similar appliances for household use covered by IEC 60335-2-12 used in the following environments by laymen: staff kitchen areas in shops, offices and other working environments, farm houses, hotels, motels and other residential type environments, bed and breakfast type environments.
This fifth edition cancels and replaces the fourth edition published in 2002, Amendment 1:2008 and Amendment 2:2017. 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) introduction of requirements for appliances intended for use in areas open to the public, including external accessible surface temperatures (Clause 1, 7.12, 11.8, Table 102);
c) exclusion of battery-operated appliances (Clause 1);
d) clarification of applicable standard for appliances for use by laymen (Clause 1, 7.12);
e) relocation of cleaning instructions from 7.12.1 to 7.12;
f) relocation of 24.101 to 22.106;
g) conciliation of the text of IEC 60335-2-49 with other standards under IEC/TC61/MT32;
h) some notes have been converted to normative text, modified or deleted (Clause 1, 7.1, 7.15, 11.3, 11.7, 15.2, 19.2, 22.101, 23.3);
i) additional requirements for measurement of input current;
j) clarification of the testing procedure in 15.1.1;
k) clarification of the test conditions in 20.1 and 23.3;
l) clarifications of the requirements in 25.3.
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.