DSH 412 Detection of fault

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DSH 412

Detection of fault / I- Y' _" K! p1 }  j: {0 ~

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60601-1(ed.2);am1;am2

Standard(s)- (year and edition):
+ q- p2 O- r7 B7 X4 jIEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s):
Sheet n°: DSH-412
Subject: Detection of fault
' `8 ~/ ]3 C0 u* P7 aKey words: SFC, detection, fault
Confirmed by CTL at its 39th meeting, in Cologne
Question:
3 f0 g6 F  i( v# E9 N% R7 [Shall a fault which remains undetected be considered a NORMAL CONDITION (NC) or a
( K- m9 J2 B' R: @' iSINGLE FAULT CONDITION (SFC)?
If every fault is considered as SFC, regardless of whether it is detected or not, the
, _+ ~# K1 e; i6 M/ e  qconsequence will be that there is no protection required against situations where an
undetected first fault is followed by a second fault which may cause a SAFETY HAZARD.
Decision:
* s: m2 F' b. V9 W* y# d2 q- NIf a fault is not detected (for example by periodic inspection, maintenance, auto test, etc....), it
shall not be considered as a SINGLE FAULT CONDITION.
Time periodicity for the detection of fault depends on the risk analysis

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