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|  DSH 412
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/ k1 `7 |$ \5 ^$ u- q | Detection of fault
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3 _3 I3 J! w1 q% R( ~ | 60601-1(ed.2);am1;am2( J, A ?( S. t6 Y# z6 e
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Standard(s)- (year and edition):+ N& D) ~; P) A" w! z/ w. J
IEC 60601-1:1988 Ed.2 Am1+Am21 _+ ^" F* I- l7 o$ Z+ o
Sub clause(s): 9 {7 s' Q9 U% Z. ~+ t6 V, X# H
Sheet n°: DSH-412/ I; E0 ^' }0 Y |$ I! {
Subject: Detection of fault7 [" M3 Q8 e8 T' t
Key words: SFC, detection, fault
4 p9 o' \* {) b" c. s. C0 MConfirmed by CTL at its 39th meeting, in Cologne; i2 n$ y% q5 W% v/ v$ Z# ^% g
Question:
$ t# C4 a# W2 J. M% N0 g: OShall a fault which remains undetected be considered a NORMAL CONDITION (NC) or a
* T9 \' a1 x+ B) uSINGLE FAULT CONDITION (SFC)?
" _1 y) E( D6 Q, EIf every fault is considered as SFC, regardless of whether it is detected or not, the! F! @& i' D0 Y5 L
consequence will be that there is no protection required against situations where an
- m9 G; x: p2 Q: uundetected first fault is followed by a second fault which may cause a SAFETY HAZARD.
6 A9 \& L% v9 u% JDecision:6 ~6 Q2 J7 K; ?3 x9 C& m
If a fault is not detected (for example by periodic inspection, maintenance, auto test, etc....), it' }+ ?8 n1 c3 U$ k! a' {+ ^+ c
shall not be considered as a SINGLE FAULT CONDITION.# h: d0 d# `- S1 n* L7 z
Time periodicity for the detection of fault depends on the risk analysis
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发表于 2012-11-5 11:27
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