DSH 420 Enclosure leakage current caused by external voltage

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DSH 420 9 _8 H; f7 ~2 s5 F7 z9 }

Enclosure leakage current caused by external voltage 9 P) A4 C* m* _4 h" M

19, 19.2 c)

60601-1(ed.2);am1;am2 / \/ @7 F% M" j0 t- Z! r- b- }3 P

4 m1 D9 ?( B8 [5 ]Standard(s)- (year and edition):
$ C2 J* ^6 o% E+ d! b# q# l7 yIEC 60601-1:1988 Ed.2 Am1+Am2
$ U: G9 S  n0 z' L* cSub clause(s): 19, 19.2 c)
Sheet n°: DSH-420
Subject: Enclosure leakage current caused by external voltage
) n) v! P2 l! S8 O' M; p" YKey words: Enclosure, leakage current, external voltage
Confirmed by CTL at its 39th meeting, in Cologne
Question:
% A7 q! ^- ~. YSince INTERNALLY POWERED EQUIPMENT has no reference to earth, the ENCLOSURE
: O) [" {+ G. ?' \- a3 \5 E% z- z1 KLEAKAGE CURRENT flowing between different parts of the ENCLOSURE will not be affected
* j9 ]1 d0 X! K' q( y9 J: Lby 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
. R' C" B$ k, b. o8 L: fwith 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
0 {% Q* M' \( p0 E1 T" v! w2 V19.4 h) 8) and Figure 25 (Measurement of the PATIENT LEAKAGE CURRENT flowing
% w9 |1 R" P* t! H, n) O9 K/ a" Ofrom 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
$ A2 ]; F5 I6 z9 n- S" A( U5 gEQUIPMENT with an internal battery.
Decision:
. z1 H: c4 n7 jTo clarify this issue, Sub-clause 19.4 g) 3) should read : .......”and INTERNALLY POWERED
EQUIPMENT are tested for ENCLOSURE LEAKAGE CURRENT flowing between the
ENCLOSURE and earth and also between different parts of the ENCLOSURE (measuring
; F& E& d! s1 S7 v/ Vdevice applied as MD1 and MD2 in Figure 18).”
% V2 @0 @1 b; E' S/ V( Z$ b# u5 A
% n3 w( A' C8 ]  S1 O+ o2 {