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|  DSH 399; D2 `2 r! Q) R) r
9 @6 {: a6 t- q0 A7 j7 R | Component impedance" m" h3 C# i3 s) _, ~
| 17a) and 17g)
9 K! _) B4 _9 P! Q | 60601-1(ed.2);am1;am2/ s/ G& m3 Z5 U8 a" c9 ^
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" B/ O4 s% ^% B# {0 x' OStandard(s)- (year and edition):7 ?' \( ^: c$ a) F, i% E. R
IEC 60601-1:1988 Ed.2 Am1+Am2
" p6 | g2 W4 z& ]5 v' M B5 sSub clause(s): 17 a) and 17 g)
. Y6 W: j: [* |* P* c; q' nSheet n°: DSH-399
6 u6 |# H; {, x6 LSubject: Component impedance
7 t: R# z/ ]8 S& M. P4 D$ w% cKey words: Component impedance, high integrity
% K _. X% q6 q; B) FConfirmed by CTL at its 39th meeting, in Cologne* ^2 t2 Q2 {* D7 f- V0 M" V
Question:
1 [9 L/ m! C- M8 Q8 G fComponent impedance is generally unreliable. Components certified to IEC 60384-14 etc. can7 `% C5 A" p, g- K; e
be considered of high integrity. Is the impedance of a component sufficient? Does investigation
7 t, d4 h$ o8 B$ j; Zof the product require further review of AIR CLEARANCE and CREEPAGE DISTANCE for such3 G" l8 p6 I+ R3 R: m; L
a component? Does this sub-clause mean that further component review is not required?% E; s4 _/ H5 W
Decision:
4 K6 Z! G6 n. HSecondary circuits providing protective means after short-circuiting of inadequate AIR9 @4 X$ U0 h/ N, b( [/ N9 h; ]
CLEARANCE and CREEPAGE DISTANCE must be investigated. Failure of components in2 F3 ?% I7 a- e
these circuits shall be investigated as a SINGLE FAULT CONDITION) k9 d; \, V4 M& C% v% I) f7 E
6 y7 x0 V' Q- t5 F8 Y7 y+ x
3 d& L8 {& c# K( l/ b
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发表于 2012-11-5 11:51
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