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|  DSH 1026: o0 z& g" V4 a9 q1 O5 K4 c. ]) j
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| Application of the metal foil in order to verify compliance during dielectric tests on devices of IE ...
. S# b! B$ y: C$ `2 ? | Annex R 3 f6 n0 s. i& j! K
| 60947-1(ed.5);am1; [" X# Z. h4 }. j4 P; L M8 R
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' t* s* B9 ~0 Z5 w. IStandard(s)- (incl. year)
( L1 ^3 F: ?% E& V) ~8 J9 TIEC 60947-1:2007 + A1:2010 and other standards with similar dielectric test requirements: T, Y- e3 u7 J( j7 G
Subclause(s): Annex R
9 o6 ?! Q4 y4 B1 RNo. Year
& c, R: ^0 `, N# u: { X. ?PDSH 1026 2011/ C9 T7 u# B5 G8 F% g
Category:
. y0 o& x K) _) UPOW + PROT
q6 c. g3 W: ~Developed by: ETF7
7 C+ B( Z$ t/ Y* s ~" O5 [Subject: Application of the metal foil in order to verify compliance during dielectric tests on devices of IEC 60947 series
2 ?- h8 ]1 v: z8 H4 @Key words: Application of metal foil Dielectric tests 4 j* n+ i6 m, g- Q( P1 q% c
approved at the 2012 CTL Plenary Meeting, G3 o) L% h/ F# a$ K+ w K
Question:
6 J2 \) @, }: jWhat is the correct manner of applying the metal foil required for dielectric tests' i o4 R& p, g" H. H9 D" m
according to Annex R of 60947-1?6 }* X( c" d! T* I
Rationale:
& `5 B" {5 _+ @9 UAnnex R of 60947-1, subclause R.2.2, gives instructions for the geometrical zones,) m h1 W' _* ]- Y
where the metal foil shall be applied. The examples in Figure R.3 have often been a. T$ X- V" h& c5 B
cause for discussions between test laboratory and customer as to which surfaces y+ u7 a1 g& t6 x
shall be covered and whether or not the foil may come in contact with hazardous-liveparts1 N# h! g5 r2 [: A6 I1 ^+ H
(e.g. terminals and connected conductors) located in these zones.. A6 F7 m) _& V3 }. }3 i
The text of R.2.2 clearly states that all surfaces within the defined safety zones shall6 u) ~; x+ x9 Z n9 N1 C2 Q
be covered by the metal foil regardless of the orientation, unless the manufacturer9 ~, w6 ] W. S9 W
provides specification for mounting or the use of additional enclosures preventing
* N/ A W1 e$ d# T" b, E8 faccess to these surfaces.$ S+ {; F$ T2 |* v
The guidelines not only state that the foil shall not be depressed into holes but also
$ v9 P6 s: L* J1 h2 Yindicate that this requirement shall be applied to holes, where the test finger cannot; |' q; Q, X- p3 f* Y1 X; C% ^6 u
penetrate (see note to figure R.3). This might be interpreted to the effect that the foil
1 ~% _/ N' t8 V: X, i5 Jshall be adapted to outlines of the device forming cavities with diameters larger than' X1 M, l9 A$ d+ O- F$ _$ i
12.5 mm, according to the shape of the test finger.
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发表于 2012-11-7 18:37
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