DSH 416 Leakage current of floating circuits

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DSH 416 3 R* f1 x# V5 |+ o) R; Z  }9 C' D

Leakage current of floating circuits

20, 20.2 # b7 g. N. v; C7 V; ?1 L+ c4 }

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

0 p# h4 X$ `8 P4 LStandard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
9 C" c! W& }$ QSub clause(s): 20, 20.2
: `0 J' s2 Y+ gSheet n°: DSH-416
- z- U$ z2 F- z4 b6 ^/ R; D& RSubject: Leakage current of floating circuits
3 r/ S! M/ n# C1 j; {8 a& }Key words: Floating circuits, leakage current
Confirmed by CTL at its 39th meeting, in Cologne
Question:
3 ~0 |' n. T5 [) ?, AEQUIPMENT 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
% k. K/ O$ a9 g# o! Ccurrents to earth or to other ACCESSIBLE PARTS. There would therefore appear to be no
requirements for safety separation between these circuits and ACCESSIBLE PARTS or
: d9 m7 `7 f4 B6 u9 d" nAPPLIED PARTS. But voltages within these circuits or in conjunction with other circuits may
lead to currents exceeding the values given in Table IV.
Decision:
; @0 t1 u& d) s- Y3 O. a, F( e2 MIf the failure of insulation of such isolated circuits is likely to lead to a SAFETY HAZARD, such
. z6 W1 A4 ?9 u" Q5 _insulation should be short-circuited before determining whether a part is LIVE. This shortcircuit
should not be treated as a SINGLE FAULT CONDIT ION unless the insulation
7 ^+ x' t0 C  K& nconcerned satisfies the requirements for BASIC or SUPPLEMENTARY INSULATION
+ M9 N5 t( S1 O; x: f+ \6 Inecessary for the voltages within the isolated part.
9 ~! h! u! ~, T! Z  ~: o