DSH 583 Temperature control of cordless kettle

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 583 , E/ u  D  j* g% ]% y! C: ]% X 7 b8 v/ Z& `: V

Temperature control of cordless kettle

Clause 2.2.9.2, Clause 11.4.1

60730-1(ed.2) & 60730-2-9(ed.1)

Question:
1 f! t& j6 e& xDuring the testing procedure of one kind of control according to standards IEC 60730-1 and IEC 60730-2-9 (see attachment)
Q1: Is there any combined action in this kind of kettle control? Is the melt contacts a failure according to the standard clause 11.4.1?
In the standard IEC 60730-1:1993 second edition as well as in IEC 60730-1:1999 third edition, the clause 11.4.1 Combined actions says: a control having more than one action with one of the actions designed to operate after the failure of the other actions(s), shall be so construction that this action remains operative after failure of any portion unique to the other action(s).
Q2: Does this kind of kettle control meet the requirement of clause 11.4.1 of standard IEC 60730-1? According to the declaration of the control maker, the thermal cut-out is designed to operate after the failure of the temperature limiter and the thermal sensing element is designed to operate after the failure of the thermal cut-out.
1 m0 O- I$ V* R, e" {Q3: Is the Thermal sensing element integrated within the control Non-bi-metallic single operation device according to the clause 2.2.9.2 of standard IEC 60730-2-9:2004 edition 2.2? For the controls, the applicable standards are IEC 60730-1 and IEC 60730-2-9. In the standard IEC 60730-2-9:2004 edition 2.2, the clause 2.2.9.2 defines a device called Non-bi-metallic single operation device: part of a control the operation of which cannot be separated from other functions of the control and having a non bi-metallic sensing element that operates only once and then requires complete or partial replacement.
Q4: If the Thermal sensing element is the Non-bi-metallic single operation device, can it be tested separately? It is noted in clause 2.2.9.2 of standard IEC 60730-2-9:2004 edition 2.2: When such parts can be tested separately, they are considered to be thermal links within the scope of IEC 60691.
- J4 ~! W  ]9 P* ]Decision:
The thermal sensing element (nylon stick) in question is no electrical device. For testing the nylon stick is no standard available.
2 c$ ]0 X" |$ s: P) pIEC 60691 is not applicable because the nylon stick is not in the scope of this standard. For this reasons:
- it’s not possible to certify the thermal sensing element (nylon stick) as a single component.
' H% h) Q0 \9 x% E9 Z3 l: c  q6 M1 ?- the thermal cut-out and the temperature limiter have to be considered separate.
- the thermal cut-out and the temperature limiter shall could be certified in accordance to IEC 60730-2-9.
- in accordance to clause 2.2.9.2 of IEC 60730-2-9 the nylon stick together with the temperature limiter could be seen as SOD (non-bimetallic; requirements as in clause 17.15.2 of IEC 60730-2-9) and could be certified as component in the kettle control.
) B. r8 g  }' k3 u3 Y: S- D3 ?4 gThe relevant parts of the connection of the kettle control and the kettle have to be considered during the investigation.
The requirements of the electrical connection of the kettle control and the kettle has to be considered in accordance to IEC 60335-2-15
' w5 X6 `7 D" ?- the arrangement of the kettle control and the kettle could be certified in accordance to IEC 60335-2-15
& g- T0 N3 i& \- [/ p- m

9 p  E; F* w" M; N# w& L* n
4 ?$ u6 f) Y$ I0 d0 }6 u