DSH 399 Component impedance
http://decisions.iecee.org/icons/ecblank.gif DSH 399
Component impedance
17a) and 17g)
60601-1(ed.2);am1;am2
Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 17 a) and 17 g)
Sheet n°: DSH-399
Subject: Component impedance
Key words: Component impedance, high integrity
Confirmed by CTL at its 39th meeting, in Cologne
Question:
Component impedance is generally unreliable. Components certified to IEC 60384-14 etc. can
be considered of high integrity. Is the impedance of a component sufficient? Does investigation
of the product require further review of AIR CLEARANCE and CREEPAGE DISTANCE for such
a component? Does this sub-clause mean that further component review is not required?
Decision:
Secondary circuits providing protective means after short-circuiting of inadequate AIR
CLEARANCE and CREEPAGE DISTANCE must be investigated. Failure of components in
these circuits shall be investigated as a SINGLE FAULT CONDITION
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