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| DSH 4200 q0 k% ^+ R3 T, ^0 O* m; {
: j2 c8 Z) {5 X | Enclosure leakage current caused by external voltage5 A3 J$ r. z) Q+ Q7 U( d) a
| 19, 19.2 c)
+ n; ?( g+ v2 s5 E4 s9 J) B# x | 60601-1(ed.2);am1;am2
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Standard(s)- (year and edition):
" A3 g, v3 O8 j) _0 b% a$ eIEC 60601-1:1988 Ed.2 Am1+Am2
" R, x; Y/ e, P) {Sub clause(s): 19, 19.2 c)
! H2 V& k! L* YSheet n°: DSH-420
: B. P2 G2 b9 W$ ]; l( hSubject: Enclosure leakage current caused by external voltage
" j" }/ p6 L. u- [3 AKey words: Enclosure, leakage current, external voltage
- n) Y! n! J2 g1 a8 q9 _! jConfirmed by CTL at its 39th meeting, in Cologne+ k; T2 x, r7 w# }) G
Question:
n* g, e- H* y4 Y# ]Since INTERNALLY POWERED EQUIPMENT has no reference to earth, the ENCLOSURE7 \& w( v2 J! `" a# P+ C
LEAKAGE CURRENT flowing between different parts of the ENCLOSURE will not be affected
/ o. }6 O2 A z4 s+ F4 fby an external voltage applied between earth and a SIGNAL INPUT or SIGNAL OUTPUT) K+ ]7 G0 m, G" V. I* A
PART. Therefore the ENCLOSURE LEAKAGE CURRENT for INTERNALLY POWERED9 x& V+ d0 k# a) Q$ g( {' @ h1 R* z
EQUIPMENT caused by such a voltage, should be measured as for CLASS II EQUIPMENT
% i) W& m0 ~7 F1 E6 S! Owith MD1 between the ENCLOSURE and earth according to Figure 18. Further, the external4 S7 o- I) ]) g; {+ J6 l- L, M
voltage to be applied should be specified in Sub-clause 19.4 g) 3), in a similar way as in Subclause7 Z/ E; {8 l, B+ Y
19.4 h) 8) and Figure 25 (Measurement of the PATIENT LEAKAGE CURRENT flowing* {/ z1 n5 Q8 _
from the APPLIED PART to earth, caused by an external voltage between earth and any1 [' W) n, s7 |5 L3 `$ F4 e
SIGNAL INPUT or SIGNAL OUTPUT PART), except that supply frequency does not apply for% U% w* K7 |% V; M
EQUIPMENT with an internal battery.
y$ G7 J9 L/ s% f ODecision:+ `; x$ j8 g/ |" z1 {% g8 A
To clarify this issue, Sub-clause 19.4 g) 3) should read : .......”and INTERNALLY POWERED
2 D$ Q2 [ Z5 z* pEQUIPMENT are tested for ENCLOSURE LEAKAGE CURRENT flowing between the6 M. [5 L+ U& y2 G2 h- k/ q4 y
ENCLOSURE and earth and also between different parts of the ENCLOSURE (measuring1 H* M9 c7 Y, d' h$ J' f: l
device applied as MD1 and MD2 in Figure 18).”
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