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3 }* F0 @$ o3 Q0 [2 X5 KStandard(s)- (year and edition):3 p Z* U' v" @; ~+ a! H
IEC 60601-1:1988 Ed.2 Am1+Am22 r! P4 X) b( n& b3 q6 s
Sub clause(s): 9 n9 i8 M2 k, H% [. |. D+ z- X
Sheet n°: DSH-4121 T/ p: f, y8 J# G# W
Subject: Detection of fault
9 x% F% ]7 }7 ^) `Key words: SFC, detection, fault
% r# E' K) ?9 `" F2 ?5 w/ A, `Confirmed by CTL at its 39th meeting, in Cologne i, O- d$ y& h3 \' T9 V
Question:9 J o I/ _/ p0 Y! y$ f
Shall a fault which remains undetected be considered a NORMAL CONDITION (NC) or a
+ W8 k: r2 J+ j# t. t/ {0 W5 [SINGLE FAULT CONDITION (SFC)?1 `! a \6 |4 h" T, @+ o
If every fault is considered as SFC, regardless of whether it is detected or not, the3 P/ u3 w9 E" d8 O0 \# P& m5 H0 A& H7 b
consequence will be that there is no protection required against situations where an- U$ B6 l2 U# s6 \7 p! a* j
undetected first fault is followed by a second fault which may cause a SAFETY HAZARD.2 E* |: [, }( s
Decision:
9 d3 l x) Q; V! C$ dIf a fault is not detected (for example by periodic inspection, maintenance, auto test, etc....), it
+ o: B: o1 U( c: E/ @shall not be considered as a SINGLE FAULT CONDITION.
) s: a1 u' N/ w8 v" M5 D7 J# @& oTime periodicity for the detection of fault depends on the risk analysis( Q( {5 R2 J$ A5 {
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+ D' h, G% r+ }! J9 {
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发表于 2012-11-5 11:27
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