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|  DSH 420" e ], W' s7 B5 g, |& i* w7 }
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| Enclosure leakage current caused by external voltage
* K9 U; H! @- B- _9 G p5 G3 ? | 19, 19.2 c): ]( h# N( v* b3 J: Y5 _
| 60601-1(ed.2);am1;am2
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Standard(s)- (year and edition):1 a0 H) b* F% Z/ m
IEC 60601-1:1988 Ed.2 Am1+Am2& f( m! p. \, X2 R) R7 ]/ h! q
Sub clause(s): 19, 19.2 c)4 Y7 [* ?3 `, w* {
Sheet n°: DSH-420$ o' ]/ z6 G5 m) X& {' n
Subject: Enclosure leakage current caused by external voltage+ ?; m7 q9 U; |+ L
Key words: Enclosure, leakage current, external voltage
7 L$ M7 E* k# Q# J2 z' OConfirmed by CTL at its 39th meeting, in Cologne, F8 a; h3 H: A: b* @$ p. f' g- K
Question:3 S$ u Z% s" u6 Y) W- f
Since INTERNALLY POWERED EQUIPMENT has no reference to earth, the ENCLOSURE
6 |" s, u% k$ j6 S* d% k" qLEAKAGE CURRENT flowing between different parts of the ENCLOSURE will not be affected# S3 q$ e; O8 J+ D; \+ W
by an external voltage applied between earth and a SIGNAL INPUT or SIGNAL OUTPUT
2 Q1 h6 m( I5 _7 r- y" @PART. Therefore the ENCLOSURE LEAKAGE CURRENT for INTERNALLY POWERED. Q" i1 e, U# V2 g9 J1 a
EQUIPMENT caused by such a voltage, should be measured as for CLASS II EQUIPMENT
0 N3 `. M( l& T1 B' Nwith MD1 between the ENCLOSURE and earth according to Figure 18. Further, the external
4 F3 w& N1 n5 F- x" \9 hvoltage to be applied should be specified in Sub-clause 19.4 g) 3), in a similar way as in Subclause2 K. q/ q# g+ p- s
19.4 h) 8) and Figure 25 (Measurement of the PATIENT LEAKAGE CURRENT flowing- u' a9 u) b% U6 O) S. j
from the APPLIED PART to earth, caused by an external voltage between earth and any
2 n5 F. e; K5 d4 E7 Q- \SIGNAL INPUT or SIGNAL OUTPUT PART), except that supply frequency does not apply for+ O/ ?; `" m) T9 [ u/ i
EQUIPMENT with an internal battery.
, h1 k$ t* M4 T$ Z' y( W4 g8 ~Decision:
, U% G7 W% d, k# I HTo clarify this issue, Sub-clause 19.4 g) 3) should read : .......”and INTERNALLY POWERED3 o, ]$ u! d; Q% l' p) T+ E7 S3 Q
EQUIPMENT are tested for ENCLOSURE LEAKAGE CURRENT flowing between the6 ^2 P2 S. B. Y# l+ w7 i, h
ENCLOSURE and earth and also between different parts of the ENCLOSURE (measuring7 f/ p4 |4 [2 H7 t) X2 ~+ E
device applied as MD1 and MD2 in Figure 18).”
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