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|  DSH 399; h& }) d. |* c0 B8 m
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| Component impedance* C5 K) k, P% r5 t! r
| 17a) and 17g)1 O+ T6 M( q% E( v$ D
| 60601-1(ed.2);am1;am2
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& h) I# F- a& t* f/ a6 O3 k2 pStandard(s)- (year and edition):
# ?6 _8 T# S9 `6 T( SIEC 60601-1:1988 Ed.2 Am1+Am2
" x8 T) m# g1 M2 N6 c# `Sub clause(s): 17 a) and 17 g)
7 V8 K3 N$ e/ }' z$ jSheet n°: DSH-399
0 A$ N+ e) _8 {! q, H( }) xSubject: Component impedance
1 W. I+ F/ ^) \0 j% b9 V5 J3 t+ jKey words: Component impedance, high integrity0 \$ z; Q3 n8 V$ @/ I
Confirmed by CTL at its 39th meeting, in Cologne( y& U7 Y* d( k) @/ Q
Question:
$ P* q4 y2 ~% b5 kComponent impedance is generally unreliable. Components certified to IEC 60384-14 etc. can" K2 D: N0 m5 J( T; {( d- L. t
be considered of high integrity. Is the impedance of a component sufficient? Does investigation
' x! o) N8 v+ X3 h* y7 ]of the product require further review of AIR CLEARANCE and CREEPAGE DISTANCE for such; k: h1 Q: c4 e- c$ e) d# e
a component? Does this sub-clause mean that further component review is not required?2 L9 l" t. s9 V1 J
Decision:* I) i5 s, o q" k) U$ t8 u" N
Secondary circuits providing protective means after short-circuiting of inadequate AIR- x' R7 K6 a' z; t( o
CLEARANCE and CREEPAGE DISTANCE must be investigated. Failure of components in
: Z' b* ?" G% @& ~( v. Tthese circuits shall be investigated as a SINGLE FAULT CONDITION& i! y3 A6 E8 T6 ]
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发表于 2012-11-5 11:51
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