DSH 575 Mechanical hazards

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 575 . E$ s+ [* O; }3 k% u( z, K+ Q 7 Z$ l, J$ m4 r9 ~; z8 T0 g! q  a' T

Mechanical hazards

20.101 and 22.103

60335-2-54(ed.3) 3 ?7 W8 D( s* R. _* S. I" n8 ?7 H: K

Question:
) i$ M) ^7 p+ ^( N' iA steam cleaner has a construction consisting of one deposit with a mechanical valve, a heating element controlled by a switching element with two fixed positions (on/off). The steam cleaner has an attachment consisting in a gun to project vapour with a pressure between 2 and 3 bar (see attached photographs).
  Z2 c0 [  T, w. y* WThe output of vapour is continuous, and there is no means to control this output.
8 k# F* ?) {: AIn this conditions after switching on nothing happens, and approx. 4 minutes afterwards, the pressurized steam and some drops of hot water begin to exit suddenly.
  B; b# x; G, z5 ], ]5 DClause 20.101 of IEC 60335-2-54 requires that "appliances shall be constructed so that inadvertent operation is unlikely".
According to the construction of the appliance the switch my be activated applying the cylindrical rod of the standard.
1- Does this appliance meet the requirement of sub-clause 20.101?
2- Taking into account that the operation of the steam cleaner begins 4 minutes after the operation of the switch (without any signal warning about the sudden output of steam), can it be considered that inadvertent operation is likely even if the user has switched on the appliance?
7 L  Q  ?" e) D  DSince the sub-clause 22.103 states that "steam cleaners shall be constructed so that there is no spillage of water or sudden jets steam or hot water likely to expose the user to a hazard when the appliance is used in accordance with the instructions. Steam emission shall stop when the switch actuator is released".
/ L% Z% ?# T7 h3-: Does this construction comply with sub-clause 22.103?
5 @& k6 r6 u: X  m$ p  U8 Z6 EDecision:
) x* B# k  O# e0 U0 K" v% `To the questions proposed, the answers are:
1 D3 e3 G5 N4 b5 M! p: U1 - NO
2 - YES, even if the switch is in a recess as in this case
% I! D2 W  e/ `6 l5 v3 - NO
2 d9 H3 b/ h" G# P( BExplanatory notes:
This is also confirmed in TC61 Cape Town meeting 2005.


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