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Standard(s)- (year and edition):- F& T( R. Z$ @# Z' c( ^
IEC 60601-1:1988 Ed.2 Am1+Am2* ^3 N$ x# c9 w5 b3 k! Z
Sub clause(s): 17 a) and 17 g)
8 x# j* ?0 @$ J! Q& FSheet n°: DSH-399
4 r, J: Q2 }/ K% E6 `6 jSubject: Component impedance
' N5 l0 U& M- i0 q0 lKey words: Component impedance, high integrity
& F; u* t) ]7 Y, z& j; z) j# HConfirmed by CTL at its 39th meeting, in Cologne
9 s' b" t8 i b: g( G) a" qQuestion:
' u3 {1 }+ O) U' D; LComponent impedance is generally unreliable. Components certified to IEC 60384-14 etc. can9 [1 Y5 k% Q, T) k/ e
be considered of high integrity. Is the impedance of a component sufficient? Does investigation
1 V* Q% Q9 K' f3 jof the product require further review of AIR CLEARANCE and CREEPAGE DISTANCE for such
9 j" Y$ f6 Z7 `a component? Does this sub-clause mean that further component review is not required?1 y; l3 A+ O! h) }2 t
Decision:4 F6 O5 i4 z o0 O! x
Secondary circuits providing protective means after short-circuiting of inadequate AIR
- T+ A7 W6 J. `& xCLEARANCE and CREEPAGE DISTANCE must be investigated. Failure of components in& e. C3 p4 D6 r) l0 U b
these circuits shall be investigated as a SINGLE FAULT CONDITION
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