On IEC 60335-1: 2010 (5.O Version) shell and handle temperature rise questioned

 

Xiamen Comfort Science & Technology (Group) Co., Ltd.

 

Abstract: Household appliances Fever is an important project safety requirements. The previous version of the IEC 60335-1 requirements for electric appliance enclosure temperature values ​​are relatively high, which for some massage equipment products may cause harm to the human body overheating. Although the IEC 60335-2-32 (GB 4706.10-2008) increased in 11.8 "and the parts in contact with skin or hair, and its temperature shall not exceed the normal use grip handle continuous temperature rise limits specified" However, in most cases, the molding material for the handle remains high.

 

Keywords: housing; handle; temperature; questioned

 

    "Household and similar electrical appliances - Safety - Part 1: General requirements" IEC 60335-1:2004 (Ed4.1 Version) has been upgraded to IEC 60335-1:2010 (5.0 version). Chapter 11 of the standard heat of 11.8: "To continuously monitored during the test, the temperature rises shall not exceed the values ​​shown in Table 3." Two versions of Schedule 3 of the electric appliance housings and continuously held in normal use handle the requirements of temperature shown in Table 1.

 

  Schedule j two versions are under Note 2 states: "The temperature is 25 ℃ specified value basis." Is the show version 5.0 of the electric appliance enclosure temperature according to different materials allowed to reach 75 ℃ ~ 100 ℃. Of course, the heat from the material level, you can choose suitable material. From the Schedule of 3T Note 1: "If you use materials not mentioned in this table, these materials withstand temperatures should not exceed the material heat aging test determines the ability." Aging test is presented in Appendix C of the standard motor conducted with each increase of the temperature of the insulating material 10 ℃, the half life of insulating material to reduce total test time is given. Apparently referring to the table is based on material temperature limits specified. But IEC 60335-1 General requirements for safety of household appliances, electric appliances for products rather than for the material. Thus, a couple of questions:

 

  1. Most electric appliances are not exposed directly to the motor, but a shell cover up, such as: washing machines, vacuum cleaners, air conditioners, blenders, mixers and more. Its shell is impossible to achieve such high temperatures, why should require so high?

 

2. Some electric appliances and human contact, such as handheld electric massager, shaving Sichuan, electric clippers, skin or hair care appliances, the body can not withstand such high temperatures. Especially the shell material is thicker than 0.3mm plastic, its temperature limits than the 4.1 version also improves the 15K. Of course, for massage appliances, IEC60335-2-32: 2005 11.8 increase in the Supplementary Regulations: "in contact with the skin or hair parts, and its temperature shall not exceed the normal use continuous grip handle the required temperature rise." ( See GB4706.10-2008 11.8). For shavers, hair clippers, 11.8 increase in the IEC 60335-2-8:2002: "In normal use in contact with the skin or hair parts, or hand gripping, their temperature should not exceed In normal use, the handle grip continuous temperature rise limits specified. "(see GB 4706.9-200811.8). Attention should be drawn here, whether GB 4706.10, or GB 4706.9, have stressed in contact with the skin or hair parts, the temperature should not exceed the continuous grip handle that "under the" temperature rise, rather than "measured" temperature rise . Because such massage or nursing The heat source is not in the majority on the handle. Thus the temperature of the working parts of the handle to be higher than the actual temperature.

 

 Nevertheless, handheld electric massager massage head, mostly plastics, glass or ceramic material, the continuous grip handle allows the temperature corresponding materials were 50K, 40K, that is allowed to reach 75 ℃ or 65 ℃. The human body, even through clothing, massage a little longer in the summer in the case still can not afford such a high temperature, let alone directly massage the face and other parts of the skin. Therefore, in Table 1 above, the continuous grip handles, knobs provides temperature is high, such as handheld electric massager handle almost all molded plastic composition, when the temperature reaches continuously held 75 ℃, I am afraid to wear gloves the.

 

  Now UL 1647: 2011 "electric massage and fitness equipment," Chapter 50 surface temperature, Table 50.1 lists "is used to raise, move or grip the handle" at normal operating temperature surface maximum temperature during the test Yuan: Metallic materials 50 ℃; metallic material 60 ℃. Such a requirement is more reasonable.

 

  In fact, all the production of hand-held electric massager on the case temperature has ... a limitation, Table 2 lists the company made several massager ball surface and the handle allows the temperature:

 

  It is by my company as the main drafting units developed light industry standard "handheld electric massager" statistics, manufacturing enterprises within the industry Vibrators work 30min, its surface temperature is not higher than 65 ℃ (including with heating function massage). It is also currently being developed light industry standards to determine the basis of the case temperature indicator, of course, refer to the UL 1647 standard.

 

  IEC 60335-1 as an authoritative international standards, through multiple versions. Author from IEC 335-1: 1991 3rd edition found in the current five. O version, the standard for electric appliance enclosure temperature requirement has not come down, why use material allowable temperature rise instead of the safety requirements for appliances? This one certainly has its reasons, certain products must also represent the status quo. This is why I can not understand the place, I asked this question, my colleagues expect to get the professional guidance.