60601-1(ed.2);am1;am2 9 _+ A. v, s( E& f: j; P" N2 V
6 `1 I- p3 E" I. o; l8 wStandard(s)- (year and edition):/ X9 L/ u* E% s# i
IEC 60601-1:1988 Ed.2 Am1+Am2 6 F' a* _3 ]: f- Z* x5 l) oSub clause(s): 17 a) and 17 g) " f& `; K, [9 S9 Y8 ^Sheet n°: DSH-399# p& z9 a2 o) O0 _
Subject: Component impedance ) T7 t0 }- d4 M( @8 NKey words: Component impedance, high integrity, e/ M3 P+ D5 i; q: R4 x
Confirmed by CTL at its 39th meeting, in Cologne2 J/ ?7 q3 R% E9 s
Question:2 |: j& B# ~9 G3 z0 f( W* n2 ^$ v
Component impedance is generally unreliable. Components certified to IEC 60384-14 etc. can2 c+ v3 R$ e. N: V! K' M
be considered of high integrity. Is the impedance of a component sufficient? Does investigation 6 C: S7 F; V, V) m, {+ Nof the product require further review of AIR CLEARANCE and CREEPAGE DISTANCE for such 9 P, [/ b: q8 m `" m) qa component? Does this sub-clause mean that further component review is not required? : P9 O; {9 k1 {5 j/ G2 m+ k) ~0 iDecision: # _( t0 f6 o5 a6 @8 y- G' }Secondary circuits providing protective means after short-circuiting of inadequate AIR ( P% R( j; ^7 l- Q$ Q2 q, ]CLEARANCE and CREEPAGE DISTANCE must be investigated. Failure of components in $ j9 @; r k6 |( Z" m8 A; w2 p2 v# dthese circuits shall be investigated as a SINGLE FAULT CONDITION. J$ I8 Q# E' Y: |/ m
DSH 399