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|  DSH 399
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4 w0 A' D& C) |1 ^3 S1 ? | Component impedance
: s1 l3 K8 k% B" c; I( d: W | 17a) and 17g)
( F [# T. b9 f5 G' R | 60601-1(ed.2);am1;am27 ^( e% K- t- }+ p1 e2 i
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8 U6 q7 Y/ H) o* K) s0 n X# NStandard(s)- (year and edition):
! ~+ j) P T; h1 ~% z$ m# cIEC 60601-1:1988 Ed.2 Am1+Am2
7 B. ^9 g# y+ M- ?5 r) m1 ?Sub clause(s): 17 a) and 17 g)% |: @) K: a# R* l7 C# f* ]
Sheet n°: DSH-399
1 | @) o$ q7 v' JSubject: Component impedance" D/ f) \1 l" h2 q5 K# M
Key words: Component impedance, high integrity0 u# Y, L9 `6 v( _3 Z) N
Confirmed by CTL at its 39th meeting, in Cologne
3 }% k* l* _2 @7 }- Z) S9 I1 [Question:( K6 }" g$ F6 G: K W
Component impedance is generally unreliable. Components certified to IEC 60384-14 etc. can, T' y+ ]7 y# i3 S! x# i7 n
be considered of high integrity. Is the impedance of a component sufficient? Does investigation/ d7 n) X; v( y6 [+ P
of the product require further review of AIR CLEARANCE and CREEPAGE DISTANCE for such
* x/ n0 I& M: v* z) N, Ba component? Does this sub-clause mean that further component review is not required?6 A2 \1 ^. ]! F$ I- A
Decision:9 m* a9 B: P, U4 c( v
Secondary circuits providing protective means after short-circuiting of inadequate AIR3 [' q- M: I/ ^
CLEARANCE and CREEPAGE DISTANCE must be investigated. Failure of components in
7 a# C' W; G5 ]! _these circuits shall be investigated as a SINGLE FAULT CONDITION
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发表于 2012-11-5 11:51
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