DSH 416 Leakage current of floating circuits

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DSH 416

Leakage current of floating circuits : k9 T; j. q+ k# E3 @5 o

20, 20.2

60601-1(ed.2);am1;am2 . v& a: d$ G9 v

3 U; k; c1 e- M& Z6 n& @Standard(s)- (year and edition):
% L0 e4 f6 w" r2 RIEC 60601-1:1988 Ed.2 Am1+Am2
( t6 o2 v& e! o8 G+ G/ H# D6 Y* s4 m* [Sub clause(s): 20, 20.2
7 Z8 M, s) _' O, R: p5 rSheet n°: DSH-416
. y7 ^6 V% f6 ?, VSubject: Leakage current of floating circuits
) X- P1 `. F0 X+ `" @Key words: Floating circuits, leakage current
; P9 z' ~. a1 x: j  _1 Z, k0 j9 wConfirmed by CTL at its 39th meeting, in Cologne
- {. i6 [5 n5 Q  PQuestion:
EQUIPMENT may contain floating circuits which under the definition 2.1.10 would not be
, x7 V. c6 C. C3 Wconsidered as LIVE, since contact with these parts could not result in excessive leakage
5 s" z) S) m( H% O$ }- }3 _currents to earth or to other ACCESSIBLE PARTS. There would therefore appear to be no
1 ?* C- M- d) R& mrequirements for safety separation between these circuits and ACCESSIBLE PARTS or
3 v( |5 [; V6 N# h+ r/ AAPPLIED PARTS. But voltages within these circuits or in conjunction with other circuits may
9 ]! p+ k5 W9 e2 B: E2 B' h- olead to currents exceeding the values given in Table IV.
0 b% A7 ^+ M3 m$ W& e" }Decision:
. _- x. U1 q- g' R* A) y) N: D6 MIf the failure of insulation of such isolated circuits is likely to lead to a SAFETY HAZARD, such
& p) I9 j- }* c. G* ^insulation should be short-circuited before determining whether a part is LIVE. This shortcircuit
& V" y! R% L1 q1 a1 Gshould not be treated as a SINGLE FAULT CONDIT ION unless the insulation
* @* u3 F8 ~/ t4 R2 ?" _8 Fconcerned satisfies the requirements for BASIC or SUPPLEMENTARY INSULATION
necessary for the voltages within the isolated part.
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