DSH 416 Leakage current of floating circuits

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DSH 416

Leakage current of floating circuits ' _9 \7 A5 w4 I/ w

20, 20.2

60601-1(ed.2);am1;am2 & B+ R& }5 k& e' y1 ~

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
Key words: Floating circuits, leakage current
Confirmed by CTL at its 39th meeting, in Cologne
9 B* r# e' V9 E% V5 l; \Question:
EQUIPMENT may contain floating circuits which under the definition 2.1.10 would not be
" J/ {* t9 I; \  ^considered as LIVE, since contact with these parts could not result in excessive leakage
$ y! D$ X4 a4 b: ]" }$ Scurrents 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
9 v) r2 C" F9 o5 {+ v8 P, tAPPLIED PARTS. But voltages within these circuits or in conjunction with other circuits may
lead to currents exceeding the values given in Table IV.
Decision:
, y( h  e, g! V1 FIf the failure of insulation of such isolated circuits is likely to lead to a SAFETY HAZARD, such
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
2 x" s  v& S3 V* d6 b/ jconcerned satisfies the requirements for BASIC or SUPPLEMENTARY INSULATION
necessary for the voltages within the isolated part.

( y/ ~  C4 E. m3 d$ @9 b6 d
3 F, q  I, B' l4 w# \  ~