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| DSH 10261 y% h6 j4 J6 H! T( C" b
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| Application of the metal foil in order to verify compliance during dielectric tests on devices of IE ...
- D. f' K2 g0 [% J7 } | Annex R
, c8 A8 y2 J* A, \8 x* F | 60947-1(ed.5);am1, \ P% p. Q" q' I8 e, h
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! H7 A# {4 K; F+ EStandard(s)- (incl. year): ?# h9 _2 ~$ ]
IEC 60947-1:2007 + A1:2010 and other standards with similar dielectric test requirements' B- t# Q/ ]" e% Q$ Y
Subclause(s): Annex R
: e* ?6 M9 b, i# ]7 l0 gNo. Year
4 B: A# R: e' {7 N- QPDSH 1026 2011
0 K$ a- I! x; d, ^$ i0 Y# d- zCategory:
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Developed by: ETF75 ~9 g. H* x8 a- c) a# D
Subject: Application of the metal foil in order to verify compliance during dielectric tests on devices of IEC 60947 series
6 ]2 }3 ~2 o( u' t. p% F: lKey words: Application of metal foil Dielectric tests 1 o) q% V0 ^9 }5 n: k7 j/ k
approved at the 2012 CTL Plenary Meeting
- {; b+ {. l; r X1 f/ DQuestion:
7 D* E& j, e J$ Z" W4 n) @1 a3 W" WWhat is the correct manner of applying the metal foil required for dielectric tests
8 K% `1 D" T" h( Daccording to Annex R of 60947-1?) e- n0 T1 {8 t4 S) Q- T
Rationale:
H! F- r/ c9 O* n% O3 O$ OAnnex R of 60947-1, subclause R.2.2, gives instructions for the geometrical zones,3 x B: A2 \ @8 n( }; E& @& U+ c1 k
where the metal foil shall be applied. The examples in Figure R.3 have often been a
/ v4 p7 m+ v% K% Ccause for discussions between test laboratory and customer as to which surfaces
, T) ?' f/ Y8 x2 m# G! _2 W% _shall be covered and whether or not the foil may come in contact with hazardous-liveparts
& L8 J) q/ w2 F4 K) W3 x(e.g. terminals and connected conductors) located in these zones.+ m/ i0 [% m" l6 c6 r
The text of R.2.2 clearly states that all surfaces within the defined safety zones shall
# [ E/ A9 w4 H6 r' C3 bbe covered by the metal foil regardless of the orientation, unless the manufacturer3 |* _2 j' u3 {1 L6 I. [: r
provides specification for mounting or the use of additional enclosures preventing
# \, a- S; j6 @# L! K, _! caccess to these surfaces.0 g$ p+ t+ G0 Q* O0 d5 {0 b0 M& z5 v
The guidelines not only state that the foil shall not be depressed into holes but also; a7 r! y: ? R4 d* a4 S* r
indicate that this requirement shall be applied to holes, where the test finger cannot3 z5 U1 I, f: r' A v7 ?2 S4 D
penetrate (see note to figure R.3). This might be interpreted to the effect that the foil
0 d U# }! X. j1 y% H# b) z3 Ashall be adapted to outlines of the device forming cavities with diameters larger than8 e* @& a* ~9 \% w! M6 ?1 U
12.5 mm, according to the shape of the test finger.
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