DSH 1026 Application of the metal foil in order to verify compliance during diel

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DSH 1026 ' p2 L/ u3 u5 b8 D" ^. ] ! u. j6 W# C) v# w" K2 F3 ~

Application of the metal foil in order to verify compliance during dielectric tests on devices of IE ...

Annex R

60947-1(ed.5);am1 & N/ T. Q2 r' p9 K9 _4 z4 X8 K

, `) v6 @& ?4 m4 PStandard(s)- (incl. year)
IEC 60947-1:2007 + A1:2010 and other standards with similar dielectric test requirements
Subclause(s): Annex R
, q7 o; I/ r% WNo. Year
9 h( [( n6 {1 M* `6 Z- W& N5 \+ oPDSH 1026 2011
: h& f5 Q+ b7 x2 l$ qCategory:
POW + PROT
+ p) T& p3 g" b$ o5 ^$ n3 B! LDeveloped by: ETF7
Subject: Application of the metal foil in order to verify compliance during dielectric tests on devices of IEC 60947 series
Key words: Application of metal foil Dielectric tests
approved at the 2012 CTL Plenary Meeting
Question:
What is the correct manner of applying the metal foil required for dielectric tests
according to Annex R of 60947-1?
Rationale:
Annex R of 60947-1, subclause R.2.2, gives instructions for the geometrical zones,
where the metal foil shall be applied. The examples in Figure R.3 have often been a
cause for discussions between test laboratory and customer as to which surfaces
shall be covered and whether or not the foil may come in contact with hazardous-liveparts
; z7 r$ i1 A; l(e.g. terminals and connected conductors) located in these zones.
4 J0 f- z0 M; @# VThe text of R.2.2 clearly states that all surfaces within the defined safety zones shall
/ p2 b/ U9 I5 d# J3 {be covered by the metal foil regardless of the orientation, unless the manufacturer
! A5 @% D9 d1 o, O% B# q8 lprovides specification for mounting or the use of additional enclosures preventing
access to these surfaces.
The guidelines not only state that the foil shall not be depressed into holes but also
indicate that this requirement shall be applied to holes, where the test finger cannot
penetrate (see note to figure R.3). This might be interpreted to the effect that the foil
shall be adapted to outlines of the device forming cavities with diameters larger than
12.5 mm, according to the shape of the test finger.
" ^1 R2 X/ Q# X5 c: B- u
' P/ O" I4 h5 f, T1 }