DSH 420 Enclosure leakage current caused by external voltage

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DSH 420

Enclosure leakage current caused by external voltage ( a+ ]6 Z6 U" d4 C4 f' O

19, 19.2 c) 4 Q2 l( {1 {9 x2 a0 n: e9 W: Z+ O

60601-1(ed.2);am1;am2

' Q3 E, l. J+ ^- qStandard(s)- (year and edition):
- x( n6 j; K1 G$ v  [3 OIEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 19, 19.2 c)
6 q5 {' i% o! J2 ?' s1 b- y  RSheet n°: DSH-420
Subject: Enclosure leakage current caused by external voltage
Key words: Enclosure, leakage current, external voltage
Confirmed by CTL at its 39th meeting, in Cologne
- K- ^5 B* x+ n; RQuestion:
, P# |, |9 V: [2 O# USince INTERNALLY POWERED EQUIPMENT has no reference to earth, the ENCLOSURE
) ]$ f* F6 K. v+ D! CLEAKAGE CURRENT flowing between different parts of the ENCLOSURE will not be affected
6 h* Z5 i& p& A( T; yby 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
- x0 ~9 S0 H) E7 M8 uwith 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
19.4 h) 8) and Figure 25 (Measurement of the PATIENT LEAKAGE CURRENT flowing
! F/ ]/ z& P) S. l) H* 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
; v6 J% q# Q$ b1 K- {; XEQUIPMENT with an internal battery.
Decision:
To clarify this issue, Sub-clause 19.4 g) 3) should read : .......”and INTERNALLY POWERED
& z# b" B" l8 H# J. I. g3 |# yEQUIPMENT are tested for ENCLOSURE LEAKAGE CURRENT flowing between the
! I$ K5 ^# S8 E1 ?( {7 L' O( XENCLOSURE and earth and also between different parts of the ENCLOSURE (measuring
/ L: D) O3 R1 idevice applied as MD1 and MD2 in Figure 18).”
  u9 ~' W# w5 N