DSH 420 Enclosure leakage current caused by external voltage

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DSH 420 2 E4 u6 L/ J1 B6 M

Enclosure leakage current caused by external voltage " \3 _: m( y9 ]# E# L2 u4 X5 p' G

19, 19.2 c) ! t3 H3 x. T5 B- u" x% I" K

60601-1(ed.2);am1;am2 0 y+ U. H2 |6 ?$ Z

* C( V0 o3 x4 t/ S+ O6 t4 GStandard(s)- (year and edition):
' w$ G9 e$ L$ h, y% y5 m7 s* d7 pIEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 19, 19.2 c)
$ z7 ]# I- p9 n" GSheet n°: DSH-420
Subject: Enclosure leakage current caused by external voltage
2 Q# I/ v1 @+ N! ZKey words: Enclosure, leakage current, external voltage
Confirmed by CTL at its 39th meeting, in Cologne
Question:
4 Z  s7 O: U' u$ nSince INTERNALLY POWERED EQUIPMENT has no reference to earth, the ENCLOSURE
# |$ M' {; |( jLEAKAGE CURRENT flowing between different parts of the ENCLOSURE will not be affected
$ D. ?$ Y9 W' p: n3 D  Vby an external voltage applied between earth and a SIGNAL INPUT or SIGNAL OUTPUT
7 K! w$ }: |- o. K$ f; d& BPART. Therefore the ENCLOSURE LEAKAGE CURRENT for INTERNALLY POWERED
EQUIPMENT 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
$ w# r; x8 r9 Vvoltage to be applied should be specified in Sub-clause 19.4 g) 3), in a similar way as in Subclause
' A2 q; q2 D$ I; b) X& F19.4 h) 8) and Figure 25 (Measurement of the PATIENT LEAKAGE CURRENT flowing
from the APPLIED PART to earth, caused by an external voltage between earth and any
# {( K1 Q8 s/ x7 {: l6 cSIGNAL INPUT or SIGNAL OUTPUT PART), except that supply frequency does not apply for
9 o2 {  [$ h9 D3 ~2 ^# }# VEQUIPMENT with an internal battery.
' Y' _, s9 V5 P) t3 P% z0 eDecision:
/ F) v! c3 w; ~+ i: ATo clarify this issue, Sub-clause 19.4 g) 3) should read : .......”and INTERNALLY POWERED
EQUIPMENT are tested for ENCLOSURE LEAKAGE CURRENT flowing between the
1 T/ l* D% g. N! n, u/ h* CENCLOSURE and earth and also between different parts of the ENCLOSURE (measuring
; f+ U6 l( Z( X: _  J8 }' ?) o! ]device applied as MD1 and MD2 in Figure 18).”