DSH 416 Leakage current of floating circuits

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DSH 416 + I6 g; ^- t, m  N8 V; d

Leakage current of floating circuits

20, 20.2 2 M$ \) [; t( S! ~. F% b

60601-1(ed.2);am1;am2 5 b) X7 O! D' ^' {

Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 20, 20.2
6 F$ ~  |4 b. k2 e" B4 z, oSheet n°: DSH-416
Subject: Leakage current of floating circuits
9 P# g4 k3 m  }2 B; FKey words: Floating circuits, leakage current
Confirmed by CTL at its 39th meeting, in Cologne
1 D$ G. {3 [5 T8 k* H9 T( v8 G' aQuestion:
& C/ D" |* |2 \$ q( [+ I9 YEQUIPMENT may contain floating circuits which under the definition 2.1.10 would not be
1 K/ ?$ D/ C8 w0 _2 {* |8 gconsidered as LIVE, since contact with these parts could not result in excessive leakage
. T4 v' B' \" |5 l$ [( {currents to earth or to other ACCESSIBLE PARTS. There would therefore appear to be no
' Z! ?2 ~5 h# j/ B8 R' Jrequirements for safety separation between these circuits and ACCESSIBLE PARTS or
+ C( Y2 a1 v+ q; @! z- }- T" CAPPLIED PARTS. But voltages within these circuits or in conjunction with other circuits may
! ]8 }& r, S9 L1 ]lead to currents exceeding the values given in Table IV.
) @2 P: x" K2 y& S" q' e' K& ~6 d7 SDecision:
) x2 s& Y" Q: x$ I$ NIf the failure of insulation of such isolated circuits is likely to lead to a SAFETY HAZARD, such
( s) P2 T, h8 }& ^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
, X% b+ P2 s6 d# V; y' D( ^2 Rconcerned satisfies the requirements for BASIC or SUPPLEMENTARY INSULATION
% d! i) V6 P8 h; E  o1 G! gnecessary for the voltages within the isolated part.
9 O- I3 p4 P( }+ p$ z* A6 g* R+ I

2 v! U' r. h1 {% t* @