DSH 416 Leakage current of floating circuits

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DSH 416

Leakage current of floating circuits

20, 20.2 , p/ ]/ y9 n8 ^% r% @* l. ?

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
3 z# u( b1 S; w# z( Z6 E+ h: nSheet n°: DSH-416
2 N' [  M, F& ESubject: Leakage current of floating circuits
1 i0 ^/ z; t* }/ l9 |Key words: Floating circuits, leakage current
1 @' f7 q* D5 q" k. ?9 z: t; b& CConfirmed by CTL at its 39th meeting, in Cologne
0 T  l% i. A- J$ t+ pQuestion:
EQUIPMENT 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
" U4 q* t, p$ d" O3 _2 o: Gcurrents to earth or to other ACCESSIBLE PARTS. There would therefore appear to be no
( r  _. {% d2 F: a7 {1 i: ?requirements for safety separation between these circuits and ACCESSIBLE PARTS or
APPLIED PARTS. But voltages within these circuits or in conjunction with other circuits may
) n6 X: @/ L; k0 v  [- J2 xlead to currents exceeding the values given in Table IV.
0 C* B7 f' ^9 n& O8 w7 XDecision:
If the failure of insulation of such isolated circuits is likely to lead to a SAFETY HAZARD, such
# n9 }4 ~5 b3 ~2 b& d3 Qinsulation 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
concerned satisfies the requirements for BASIC or SUPPLEMENTARY INSULATION
necessary for the voltages within the isolated part.
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