DSH 420 Enclosure leakage current caused by external voltage

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DSH 420 5 D( Q: j) c9 x7 h' @- u2 h 3 M/ R9 M* R9 m8 T! {4 K8 h

Enclosure leakage current caused by external voltage

19, 19.2 c) * {7 K( R0 I5 O; ?8 Q: ^! t- I  A

60601-1(ed.2);am1;am2 0 R; i! m  J! X$ N' A& L5 r5 D

0 l) J: b- b  b# i4 C) R- JStandard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
/ z5 ?& \# D% K" `* n4 ISub clause(s): 19, 19.2 c)
Sheet n°: DSH-420
& ?2 r/ I. G3 W: x  ^8 J4 WSubject: Enclosure leakage current caused by external voltage
0 b6 }6 d1 P) f+ b$ \Key words: Enclosure, leakage current, external voltage
' X1 \+ u- @1 N  }Confirmed by CTL at its 39th meeting, in Cologne
Question:
3 O1 o! U1 {; @: pSince INTERNALLY POWERED EQUIPMENT has no reference to earth, the ENCLOSURE
2 |" B# _. T8 o4 c$ Y* HLEAKAGE CURRENT flowing between different parts of the ENCLOSURE will not be affected
by an external voltage applied between earth and a SIGNAL INPUT or SIGNAL OUTPUT
PART. Therefore the ENCLOSURE LEAKAGE CURRENT for INTERNALLY POWERED
+ g0 o! T7 r. n7 ^5 M9 wEQUIPMENT caused by such a voltage, should be measured as for CLASS II EQUIPMENT
with MD1 between the ENCLOSURE and earth according to Figure 18. Further, the external
4 v/ _& T  t) ?1 n& V+ V) O1 Hvoltage to be applied should be specified in Sub-clause 19.4 g) 3), in a similar way as in Subclause
19.4 h) 8) and Figure 25 (Measurement of the PATIENT LEAKAGE CURRENT flowing
4 _, N1 @" g0 X/ U. Z, t; F1 Z  mfrom the APPLIED PART to earth, caused by an external voltage between earth and any
% `0 \. h8 |" w( ]5 J, o7 F2 @6 F; ]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
: u2 _+ }" v- ^9 B# \ENCLOSURE and earth and also between different parts of the ENCLOSURE (measuring
# s  W2 \2 l" w0 F# ]  Hdevice applied as MD1 and MD2 in Figure 18).”
7 T& Y9 T0 }2 J% E. ^1 O4 p  \