DSH 568 Varistors (VDR’s) across the mains

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广东安规检测
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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 568 $ S/ w  P/ @4 ?6 i; N0 M

Varistors (VDR’s) across the mains / q6 T$ X4 Y8 [3 ~) Z9 @* N6 M

19.11

60335-1(ed.4)

Question:
' j- j. |* x7 b$ fReports from different Testing Laboratories and clients expose essential differences in interpretation and testing practice between laboratories and/or Certification Bodies.
2 f# V, C+ ~3 F( N' j) EActually, the practice of one Certification Body is now being a market factor.
' Y7 ?5 K" z1 S0 w/ L' tBased on above concerns we ask for clarification:
1: Shall Cl. 19.11 be strictly followed or can solutions given under 2. be accepted.
$ F7 T' c2 p+ m1 V& J# H2: Can any of the decisions (made by OSM/EE) be accepted?
- Y4 Y% X* o0 E! ?9 b: _7 X4 H- A: VDR’s across the mains are accepted if the VDR is separately certified according to IEC 61051-1 or according to CECC 42200.
- B: VDR across the mains with a protective device to guard against short-circuit is acceptable.
- C: If A and B are acceptable, should, because of the fact that VDR’s may burn or burst during life-time due to an increasing temperature stress caused by increase of leakage current with a number of switching cycles in the VDR, a thermal interrupting device on the VDR connected in series with the VDR be required.
Decision:
. w$ f8 L) }/ j& s1 ?% P& ?. ~1. VDR’s are not short-circuited if they are used within their manufacturer’s declared specification, when tested according to Sub-clause 19.11.2 of IEC60335-1(1991).
0 p# r- h6 Y, d& h2. VDR’s are short-circuited regardless of compliance with IEC61051-1, when tested according to Subclause 19.11.2 of IEC60335-1(2001).
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