DSH 630 Measure of "touch current" passing through protective

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

8 J& }9 A- K8 P

DSH 630

Measure of "touch current" passing through protective impedance

H.8.1.10.1

60730-1(ed.3);am1;am2   A- b1 D# h% p8 I1 F- A

Question:
In measuring current passing between accessible parts connected to hazardous live parts via protective impedance, the procedure stated in the standard is the following (sub-clause H.8.1.10.1):
“Voltages and currents are measured between a single accessible part (or any combination of such parts) and either pole of the supply source.”
In a control to be incorporated in appliances where parts at extra-low voltage are connected to earth (PELV circuit connected to live parts through protective impedance), investigation on touch current shall be made against both poles of the supply source.
7 V, z4 z3 \1 N. Y7 ]% kMaking measurement of the touch current between an accessible PELV part and the line may result in stressing those components placed between protective extra-low voltage and the earthed reference.. The result will be a short circuiting of these weak components and applying 230 V, ac directly to the measuring network. In this case the major part of the current does not pass through the protective impedance and the peak current will be higher than 0,7 mA (peak value) which constitutes a failure of the test
Is this the correct methodology to follow?
/ ?  z# a" i8 q8 CDecision:
' m! |$ Y8 a) q5 O3 R( JClause H.8.1.10.1 of IEC 60730-1 addresses protection against electric shock due to a non-isolated circuit and therefore, the reference point shall be to the earthed (neutral) conductor rather than "either pole of the supply". This is consistent with the text of clause 5.1.4 of IEC 60950-1.
; ]0 S+ l! o" E- e1 j4 n

* Z  g7 P2 M1 ]% |5 h) o: }; X* g