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|  DSH 412
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| Detection of fault8 I3 w- B: }6 r ~, B# c6 {. s
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# u9 c( C9 ?; D | 60601-1(ed.2);am1;am2& Y4 Z& `, Q3 W. ?% d0 f( O
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Standard(s)- (year and edition):
! U n) ^* [# W7 e& A- MIEC 60601-1:1988 Ed.2 Am1+Am2
9 H" w, t2 B5 P% ^. z' _" @# z) ^Sub clause(s): 7 \5 ~9 h: m4 I2 y+ P, F
Sheet n°: DSH-412* l* p/ o& Z. F
Subject: Detection of fault
" `5 W' D% d4 o. sKey words: SFC, detection, fault) t8 K) a5 J7 J6 l+ G5 L4 l# Q& [ Q
Confirmed by CTL at its 39th meeting, in Cologne- r+ k ~1 j. `5 I" H% w
Question:9 q, f$ x* h# {6 T' \9 S+ f! T
Shall a fault which remains undetected be considered a NORMAL CONDITION (NC) or a6 m5 u: n# g: p
SINGLE FAULT CONDITION (SFC)?5 H: q# S; m( m+ k7 g, x
If every fault is considered as SFC, regardless of whether it is detected or not, the# Y f! p0 f3 X3 a6 J
consequence will be that there is no protection required against situations where an
0 O" j0 h/ S1 U$ A! h' s* W& y5 e2 nundetected first fault is followed by a second fault which may cause a SAFETY HAZARD.
4 e6 S0 \4 P; J2 sDecision:
0 s5 @0 q* i; Y" IIf a fault is not detected (for example by periodic inspection, maintenance, auto test, etc....), it& R( v9 B8 x3 u4 D, J
shall not be considered as a SINGLE FAULT CONDITION.
$ U* l% M* Q; FTime periodicity for the detection of fault depends on the risk analysis
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