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|  DSH 416
6 p0 c, y3 T( D, k9 s
/ h i5 B5 M" t) P& F9 ~, q8 ` | Leakage current of floating circuits b8 o" B$ e; m( M& X5 o
| 20, 20.2, c- m/ j- Z' e0 A' Y. ~
| 60601-1(ed.2);am1;am2& U1 N) a4 M$ D: P
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; _8 ]2 J% w( c' j nStandard(s)- (year and edition):
8 K" H4 @- q9 C o5 pIEC 60601-1:1988 Ed.2 Am1+Am27 H' l' j$ {0 x& R* a! j% j4 c
Sub clause(s): 20, 20.23 N) h) O) ]" V. M0 R% @& q
Sheet n°: DSH-4163 Q8 A4 [5 H8 s+ D) l- K1 h
Subject: Leakage current of floating circuits! [7 |3 B1 x1 c& c& i, T8 ^ `
Key words: Floating circuits, leakage current' H6 u% J/ U: Y6 t- l- j3 G4 M: c
Confirmed by CTL at its 39th meeting, in Cologne
; y: J- V. e" s- @Question:
5 x+ q; E: j3 @EQUIPMENT may contain floating circuits which under the definition 2.1.10 would not be
$ q3 C8 n: [& n. E2 A7 @considered as LIVE, since contact with these parts could not result in excessive leakage
5 ?3 w0 k3 L/ n$ Q. k0 dcurrents to earth or to other ACCESSIBLE PARTS. There would therefore appear to be no
2 p. g: I+ ]1 `1 r. H0 a' xrequirements for safety separation between these circuits and ACCESSIBLE PARTS or4 P( Y v' C$ j t
APPLIED PARTS. But voltages within these circuits or in conjunction with other circuits may
* ]+ F$ p7 a/ P4 Tlead to currents exceeding the values given in Table IV.
( x E8 ^* q6 W; e% c6 oDecision:
# B1 ]# E: C, k. ^; g( mIf the failure of insulation of such isolated circuits is likely to lead to a SAFETY HAZARD, such! w) V: V0 l' C* ~ X5 s$ J
insulation should be short-circuited before determining whether a part is LIVE. This shortcircuit
% X2 s" @$ b# J& i7 n( pshould not be treated as a SINGLE FAULT CONDIT ION unless the insulation* s# \$ c, `6 P2 p: `
concerned satisfies the requirements for BASIC or SUPPLEMENTARY INSULATION# A2 e4 e/ [2 ~. W2 V
necessary for the voltages within the isolated part.
8 H2 H1 {, [' R
$ t% n3 j) Z6 a& l9 ^) N! t- a0 m) ?5 p5 h6 x" H1 f' J
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