DSH 412 Detection of fault

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DSH 412 5 e' x5 ]3 D4 i

Detection of fault

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60601-1(ed.2);am1;am2 + C. p+ s7 M7 x7 _+ m

Standard(s)- (year and edition):
# t  C8 E/ m, DIEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s):
Sheet n°: DSH-412
Subject: Detection of fault
0 k  r4 e8 s5 F% KKey words: SFC, detection, fault
Confirmed by CTL at its 39th meeting, in Cologne
3 Q$ V7 J7 A" C  l2 L; R2 b9 fQuestion:
3 A7 v! c& e. f4 |! u4 N7 \Shall a fault which remains undetected be considered a NORMAL CONDITION (NC) or a
SINGLE FAULT CONDITION (SFC)?
4 \9 V7 A) S# M9 ?If every fault is considered as SFC, regardless of whether it is detected or not, the
consequence will be that there is no protection required against situations where an
/ `3 d$ l1 [3 s. fundetected first fault is followed by a second fault which may cause a SAFETY HAZARD.
Decision:
, J  Z$ W9 _, N2 ?6 H9 ^. {If a fault is not detected (for example by periodic inspection, maintenance, auto test, etc....), it
5 w  y  e5 j# t4 v# ]shall not be considered as a SINGLE FAULT CONDITION.
9 G; y. m2 q0 ^! G5 gTime periodicity for the detection of fault depends on the risk analysis
# F6 C: a3 J! m  g