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|  DSH 399
6 s0 h+ q( K# \$ Y4 }8 s' n% N K9 y
| Component impedance8 C+ Z3 B) O7 Y4 h7 E% G
| 17a) and 17g)
* r' B8 }7 z" i2 x6 y/ o( n4 Z | 60601-1(ed.2);am1;am2
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% W% y8 q4 j) R7 S! l ], LStandard(s)- (year and edition):% P+ v3 i& r! k
IEC 60601-1:1988 Ed.2 Am1+Am2, g1 v9 G5 }" K8 b% ]
Sub clause(s): 17 a) and 17 g)
/ z8 J% \) G3 I1 W6 ySheet n°: DSH-399. N- y, i0 s b9 A6 q7 V6 E0 k. ~; ~
Subject: Component impedance. b$ W2 q. b+ i0 m) v4 E
Key words: Component impedance, high integrity
, v3 F9 ?/ b k+ f! q7 ~Confirmed by CTL at its 39th meeting, in Cologne T6 D [- V5 o' k" g
Question:6 m% Y$ L8 c* a* m/ j* u
Component impedance is generally unreliable. Components certified to IEC 60384-14 etc. can
& S* b+ T2 J! j6 |4 ?+ O5 P; Fbe considered of high integrity. Is the impedance of a component sufficient? Does investigation t9 `$ Z% ?) M, c" U
of the product require further review of AIR CLEARANCE and CREEPAGE DISTANCE for such
8 F1 r, F" |) t. B; F: U( f ]0 \a component? Does this sub-clause mean that further component review is not required?7 Y' K0 H3 q- ^( e6 {. Z* a( Y
Decision:4 j7 a9 Z7 I, h! G) j, I( L% [' O
Secondary circuits providing protective means after short-circuiting of inadequate AIR
# p# t+ X3 K* p2 N+ }, e4 KCLEARANCE and CREEPAGE DISTANCE must be investigated. Failure of components in
# D# g" A \6 U+ Bthese circuits shall be investigated as a SINGLE FAULT CONDITION
( l7 u. ~6 q7 j% z+ b+ s" D( z" j* a& Q4 w' D" T. L5 o% I
# a3 J+ P: D8 Z6 P9 [6 k- ]. b% Q |
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发表于 2012-11-5 11:51
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