DSH 420 Enclosure leakage current caused by external voltage

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 420 ' `' k' ?- b: y & ~; ~6 _+ H- q, U9 Y+ H# k1 l

Enclosure leakage current caused by external voltage $ R2 {, |/ Y; D% Q) e

19, 19.2 c) ' `# }3 m) H0 J9 ]# ]2 a- D- q

60601-1(ed.2);am1;am2 0 j5 [# |1 D8 C) s, H& f3 N

Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
' |# p- X" H3 u% ~' _% U" m+ i( e( ASub clause(s): 19, 19.2 c)
- K( |1 p0 F. U/ @; ISheet n°: DSH-420
Subject: Enclosure leakage current caused by external voltage
6 O2 z# i( l" S2 B# AKey words: Enclosure, leakage current, external voltage
9 x/ b- B3 L/ B" fConfirmed by CTL at its 39th meeting, in Cologne
6 Z0 l8 O5 e' V- kQuestion:
+ T+ h0 G  U$ q8 I  X1 VSince INTERNALLY POWERED EQUIPMENT has no reference to earth, the ENCLOSURE
LEAKAGE CURRENT flowing between different parts of the ENCLOSURE will not be affected
3 I# ]; [' ?% d, Aby an external voltage applied between earth and a SIGNAL INPUT or SIGNAL OUTPUT
PART. Therefore the ENCLOSURE LEAKAGE CURRENT for INTERNALLY POWERED
EQUIPMENT caused by such a voltage, should be measured as for CLASS II EQUIPMENT
# t4 M7 E  u' h* {, Z# twith MD1 between the ENCLOSURE and earth according to Figure 18. Further, the external
voltage to be applied should be specified in Sub-clause 19.4 g) 3), in a similar way as in Subclause
: O) K% j( a8 x5 L) g6 t7 J19.4 h) 8) and Figure 25 (Measurement of the PATIENT LEAKAGE CURRENT flowing
3 V" m4 Z: ~- kfrom the APPLIED PART to earth, caused by an external voltage between earth and any
SIGNAL INPUT or SIGNAL OUTPUT PART), except that supply frequency does not apply for
EQUIPMENT with an internal battery.
Decision:
To clarify this issue, Sub-clause 19.4 g) 3) should read : .......”and INTERNALLY POWERED
EQUIPMENT are tested for ENCLOSURE LEAKAGE CURRENT flowing between the
% u+ A. p5 @, i( EENCLOSURE and earth and also between different parts of the ENCLOSURE (measuring
device applied as MD1 and MD2 in Figure 18).”