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|  DSH 399/ Q3 X1 a, D! ^
8 x& `9 ~( J. t7 {3 m) J% {( R | Component impedance2 {7 x3 {) X, |7 w; @! Q
| 17a) and 17g)0 d- k/ v% }5 ?6 Q. q
| 60601-1(ed.2);am1;am2
7 ?+ B; m* r& p) G" { |
- T- B2 u, g) w" H( ?Standard(s)- (year and edition):
( O! u. C$ Z* A" h& w& P7 NIEC 60601-1:1988 Ed.2 Am1+Am29 n5 d' L9 A6 M1 v- r2 d, _
Sub clause(s): 17 a) and 17 g)
$ I4 E' X! U1 O, G& K, LSheet n°: DSH-399( {' i0 U. @8 F8 U2 b
Subject: Component impedance0 ]! S/ Q$ V2 O! s
Key words: Component impedance, high integrity
% W+ v7 A! I3 z* o" ]Confirmed by CTL at its 39th meeting, in Cologne' f2 {- s! z1 K; H4 M
Question:
. z: ~0 {6 Y/ CComponent impedance is generally unreliable. Components certified to IEC 60384-14 etc. can- i7 Z J. Y1 h* _
be considered of high integrity. Is the impedance of a component sufficient? Does investigation; o4 ^; a" U' M. n" O( t. {
of the product require further review of AIR CLEARANCE and CREEPAGE DISTANCE for such( @" M9 f& Z+ c# O0 |; n
a component? Does this sub-clause mean that further component review is not required?
. q% K* ?3 G3 f5 ~5 C" ^; tDecision:
# Y/ j/ s# Y; Z! B$ l! I* u! {$ mSecondary circuits providing protective means after short-circuiting of inadequate AIR* x( U0 j) o# M) O
CLEARANCE and CREEPAGE DISTANCE must be investigated. Failure of components in
" q9 y8 z% d) b3 t3 L1 n. V* Vthese circuits shall be investigated as a SINGLE FAULT CONDITION
# ~0 s& Z2 [) @# F9 V% s; A+ w4 E% `7 w1 ^ Y% v
- f3 O, y6 F4 c& F4 Z6 Q
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发表于 2012-11-5 11:51
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