DSH 416 Leakage current of floating circuits

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DSH 416 7 O+ a, D; T' Z8 H! @ 4 i1 O. |: o3 T: y. q+ H

Leakage current of floating circuits ) k' ], u8 S: L/ ]1 L) Q: F+ y+ V' U1 B; C

20, 20.2 " r$ A7 T2 E6 j

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

Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 20, 20.2
Sheet n°: DSH-416
Subject: Leakage current of floating circuits
8 m0 }' S$ K/ h- jKey words: Floating circuits, leakage current
# l2 Y! k4 o& E# Q. UConfirmed by CTL at its 39th meeting, in Cologne
Question:
1 R6 i* y1 I, j. iEQUIPMENT may contain floating circuits which under the definition 2.1.10 would not be
considered as LIVE, since contact with these parts could not result in excessive leakage
: S1 L3 W1 v1 icurrents to earth or to other ACCESSIBLE PARTS. There would therefore appear to be no
8 _5 W3 G, t% @/ X' E& Crequirements for safety separation between these circuits and ACCESSIBLE PARTS or
APPLIED PARTS. But voltages within these circuits or in conjunction with other circuits may
6 `# G  W; R  clead to currents exceeding the values given in Table IV.
Decision:
If the failure of insulation of such isolated circuits is likely to lead to a SAFETY HAZARD, such
" n- P$ {$ L( v8 Y3 @  c8 Tinsulation should be short-circuited before determining whether a part is LIVE. This shortcircuit
1 K9 }3 Y! l, u3 O0 nshould not be treated as a SINGLE FAULT CONDIT ION unless the insulation
5 w4 E- n' s9 Pconcerned satisfies the requirements for BASIC or SUPPLEMENTARY INSULATION
: j; P4 F" A2 s" z: @necessary for the voltages within the isolated part.