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|  DSH 399 e6 [* a5 E( k- v$ V5 @" {6 h
; O K9 L5 g: Z: |' J | Component impedance* n) B/ y: \0 J+ i7 S- J
| 17a) and 17g)
: Z" K/ s* N9 [4 x: y) b; p | 60601-1(ed.2);am1;am2
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- }0 E+ w0 b$ t! w- }Standard(s)- (year and edition):
/ |+ i [8 \' I2 b1 LIEC 60601-1:1988 Ed.2 Am1+Am21 C& V4 z% P& @- m0 Z2 Y& y
Sub clause(s): 17 a) and 17 g)! `" v% W. ?1 x5 T
Sheet n°: DSH-399# p( ]/ w8 y) o& C! j" w
Subject: Component impedance _ ?4 \5 B0 U1 {6 @
Key words: Component impedance, high integrity& V6 q% j- h, W* p
Confirmed by CTL at its 39th meeting, in Cologne
: D" V! w3 Y0 m0 T yQuestion:/ L" Q% x& \0 v% b7 U& m8 H- k& f$ Q
Component impedance is generally unreliable. Components certified to IEC 60384-14 etc. can$ \4 i6 \: f4 e6 I$ o/ N- N) c J
be considered of high integrity. Is the impedance of a component sufficient? Does investigation
2 F$ A! j- e8 o# Yof the product require further review of AIR CLEARANCE and CREEPAGE DISTANCE for such* O- _- `2 W, h3 ?
a component? Does this sub-clause mean that further component review is not required? K- n$ S3 b. Y5 I3 T( K* U* f
Decision:4 @# h8 P8 Y( X1 R7 Y4 t
Secondary circuits providing protective means after short-circuiting of inadequate AIR8 ]6 M% {$ h+ L" J: z4 R) e& ?9 ^
CLEARANCE and CREEPAGE DISTANCE must be investigated. Failure of components in3 H Z, n( R0 ^3 ?& H6 a
these circuits shall be investigated as a SINGLE FAULT CONDITION
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. U, {% _ [& Q% F* C: P5 H g* d( p
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发表于 2012-11-5 11:51
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