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Standard(s)- (year and edition):& D, D9 v/ w& F0 X. R
IEC 60601-1:1988 Ed.2 Am1+Am2
1 J) R; `: w( GSub clause(s): 17 a) and 17 g)0 L# E* j+ C" q1 b' m% d! r
Sheet n°: DSH-399
: K6 W A) N# \! FSubject: Component impedance
r9 m) S/ B3 GKey words: Component impedance, high integrity7 \" ]* K. E, F/ {
Confirmed by CTL at its 39th meeting, in Cologne
2 S$ Z0 ?2 z; b) r$ F: |* V$ _3 CQuestion:) R' }% s" w, {1 T- g% H# }0 M
Component impedance is generally unreliable. Components certified to IEC 60384-14 etc. can
( s4 r! d. ^4 ` Z- l1 R8 Cbe considered of high integrity. Is the impedance of a component sufficient? Does investigation( C: U, ~& a- \: Y: x4 x9 L0 ]
of the product require further review of AIR CLEARANCE and CREEPAGE DISTANCE for such
/ }; c3 E, Z! w! ]a component? Does this sub-clause mean that further component review is not required?
# P# l! E7 ~/ E0 Y+ A$ c- O eDecision:6 X! d7 d% a) {8 ?, ]* }
Secondary circuits providing protective means after short-circuiting of inadequate AIR; s/ t0 R, a; M
CLEARANCE and CREEPAGE DISTANCE must be investigated. Failure of components in$ d/ Y7 ]( o7 l/ a
these circuits shall be investigated as a SINGLE FAULT CONDITION' u2 x! k0 a/ g
3 R4 r1 x2 N( R @2 I3 v
) F8 o; Q2 X, k8 G8 u
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发表于 2012-11-5 11:51
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