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|  DSH 399& _) J4 \7 Z) L6 Q' V z
4 {. x5 T5 \- E5 K' U | Component impedance
. u, Y7 N+ L. G& L4 r6 c | 17a) and 17g)
" c7 U _8 K/ z' K | 60601-1(ed.2);am1;am2, D/ A8 J& q2 L. G6 C" ]8 _
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Standard(s)- (year and edition):2 S# h! v5 K( l" s6 x
IEC 60601-1:1988 Ed.2 Am1+Am2
. W) j$ w [# s& ]8 h" g8 a/ T# SSub clause(s): 17 a) and 17 g)/ k* k' q& W3 x% \7 O H
Sheet n°: DSH-399$ N6 j" A3 I& H$ u, L
Subject: Component impedance, I! \. ]$ E/ B j8 g
Key words: Component impedance, high integrity
8 k1 {; ?$ [( K! _ X* zConfirmed by CTL at its 39th meeting, in Cologne
6 Q% U- a7 p4 E& A# X6 ^; lQuestion:( a0 @, z" o( L
Component impedance is generally unreliable. Components certified to IEC 60384-14 etc. can
: ^; I1 r5 y, X$ a7 ^$ K4 Ube considered of high integrity. Is the impedance of a component sufficient? Does investigation
; Y p; h5 f& m) jof the product require further review of AIR CLEARANCE and CREEPAGE DISTANCE for such# w1 W- \0 ?( z' C V
a component? Does this sub-clause mean that further component review is not required?
& Y6 J! }: ]8 f. E$ i4 _Decision:: @9 j5 J; q- y2 F4 G& Q0 W8 m% E
Secondary circuits providing protective means after short-circuiting of inadequate AIR
6 Y% {; A0 x, M# j- ~CLEARANCE and CREEPAGE DISTANCE must be investigated. Failure of components in, o% I r! P: L
these circuits shall be investigated as a SINGLE FAULT CONDITION
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