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|  DSH 1026
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& e' ]1 `4 h; H( R4 v/ T | Application of the metal foil in order to verify compliance during dielectric tests on devices of IE ...! I3 o* r% _8 w+ [* w9 b
| Annex R " H0 B* u" p. x6 _ v
| 60947-1(ed.5);am1
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+ W6 {& F9 i" S0 p3 {- DStandard(s)- (incl. year)# _$ F; Z5 B/ G- ]
IEC 60947-1:2007 + A1:2010 and other standards with similar dielectric test requirements
2 y8 ]+ Z" ]/ K: Q5 ^+ KSubclause(s): Annex R
& Z) E9 S2 i1 j7 w6 k; m# wNo. Year# K1 u& K' R3 z$ j G
PDSH 1026 2011
2 X9 I% v; k" R# g; H: kCategory:
8 q8 Z4 ~& F$ e5 E7 RPOW + PROT$ Y4 ~4 P# w8 y) j0 ~1 a2 U9 j# q' d
Developed by: ETF77 I8 ^/ T4 \- `& g8 [6 V
Subject: Application of the metal foil in order to verify compliance during dielectric tests on devices of IEC 60947 series
) m5 V/ }8 m; N# I! @% V4 FKey words: Application of metal foil Dielectric tests ) n! Q! Q! K/ @# o$ n( W. w: F
approved at the 2012 CTL Plenary Meeting% }8 W; F6 T. W) q2 G. W
Question:
# w7 V: Q8 e$ i' U2 I6 V. J% IWhat is the correct manner of applying the metal foil required for dielectric tests- b$ h* ?' V+ z
according to Annex R of 60947-1?: g( Z7 `5 V2 Z) k
Rationale:
) a. e, W3 h$ x' tAnnex R of 60947-1, subclause R.2.2, gives instructions for the geometrical zones,& e" B" f: _8 p$ G0 j: S, V7 Z
where the metal foil shall be applied. The examples in Figure R.3 have often been a
/ p" x9 g5 q; Pcause for discussions between test laboratory and customer as to which surfaces3 g0 b$ b4 n& Q- K
shall be covered and whether or not the foil may come in contact with hazardous-liveparts# ]0 F/ P+ v6 ^; c+ d/ {
(e.g. terminals and connected conductors) located in these zones.
" i$ ]6 ?) ~) g9 O3 w% @3 O& FThe text of R.2.2 clearly states that all surfaces within the defined safety zones shall* |& b" B' K% y1 W
be covered by the metal foil regardless of the orientation, unless the manufacturer
* ]# E0 r) L/ h2 A' p0 yprovides specification for mounting or the use of additional enclosures preventing& K* P! r: v# a2 ?) o
access to these surfaces.7 Z5 J$ i0 l$ E* Q6 f( p
The guidelines not only state that the foil shall not be depressed into holes but also$ [$ S* F! D5 Z9 [% B
indicate that this requirement shall be applied to holes, where the test finger cannot
' @( M7 A+ K- E. t: l3 ]( Zpenetrate (see note to figure R.3). This might be interpreted to the effect that the foil
. R# i! Y1 s9 K3 A/ nshall be adapted to outlines of the device forming cavities with diameters larger than/ d1 m Z ]- M4 x( `& [
12.5 mm, according to the shape of the test finger.. e7 K1 X+ r- @8 K3 @
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发表于 2012-11-7 18:37
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