Leakage current of floating circuits e- N$ ?. ^6 y# x4 |
20, 20.2 , o o5 `& E9 R/ w/ g( m* p
60601-1(ed.2);am1;am2 $ Z' @# S' H& [9 a3 U$ P, c, H& c) _/ q
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Standard(s)- (year and edition):8 D: p" F8 y: l' @0 S" z) O
IEC 60601-1:1988 Ed.2 Am1+Am2 ( \0 l- A. Y; qSub clause(s): 20, 20.2 0 z4 H8 J, m4 t3 G0 b( TSheet n°: DSH-416 ' {9 K) Z& t; R8 WSubject: Leakage current of floating circuits7 L7 P0 ?9 n& ^
Key words: Floating circuits, leakage current, B1 W! Y7 S( }$ f9 B- G
Confirmed by CTL at its 39th meeting, in Cologne O. _6 }( w/ w; x& r! h9 `# j3 x- XQuestion: 1 l. o" F7 Y% D5 y& LEQUIPMENT may contain floating circuits which under the definition 2.1.10 would not be 0 A0 f' K' s E) uconsidered as LIVE, since contact with these parts could not result in excessive leakage$ y2 `1 P% ]9 T' @ W
currents to earth or to other ACCESSIBLE PARTS. There would therefore appear to be no+ ]) c: ?- Y# J" _; p
requirements for safety separation between these circuits and ACCESSIBLE PARTS or1 x8 d& E; T/ p( N4 q
APPLIED PARTS. But voltages within these circuits or in conjunction with other circuits may% H) @* C8 f c% u/ o" V
lead to currents exceeding the values given in Table IV.8 A* k' |: f# [* Y' t$ c
Decision:: P( U) s# t: E+ Y$ V, R
If the failure of insulation of such isolated circuits is likely to lead to a SAFETY HAZARD, such& i$ h! z1 T" E- a- v6 B5 r
insulation should be short-circuited before determining whether a part is LIVE. This shortcircuit# z4 X5 J6 `8 L: m4 N
should not be treated as a SINGLE FAULT CONDIT ION unless the insulation . r5 R( E+ Y! k& u' wconcerned satisfies the requirements for BASIC or SUPPLEMENTARY INSULATION + L, e: t- m, {& m' Y4 Q4 J Onecessary for the voltages within the isolated part.9 u% w" ]7 O8 N
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[attach]77092[/attach] , F( A; p- k6 F2 o0 h
DSH 416