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|  DSH 10269 n, y9 L5 C; J; [: W+ C$ a! z- Q! h
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| Application of the metal foil in order to verify compliance during dielectric tests on devices of IE ...% \/ U2 E2 I* g+ _. l6 ~5 @1 d
| Annex R
$ ]2 {! r" Q2 Y4 i | 60947-1(ed.5);am1
8 y! h! }7 q/ |! P& H |
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Standard(s)- (incl. year)
, g& ]1 |( I2 d9 d" F$ }! HIEC 60947-1:2007 + A1:2010 and other standards with similar dielectric test requirements
" k; R! s6 H6 J5 t0 aSubclause(s): Annex R7 {8 h8 @ s% |7 m& y
No. Year
* N6 i& i, X/ E, CPDSH 1026 20111 _) M; d" A- y
Category:
; O& O- w+ l, g( @, N8 J$ ^POW + PROT7 `. `! z4 o: G, x
Developed by: ETF7
- q* Y* w, k8 Y0 d6 t# mSubject: Application of the metal foil in order to verify compliance during dielectric tests on devices of IEC 60947 series
- a& b. j3 k4 F$ k) P* @Key words: Application of metal foil Dielectric tests 6 j% G k# D7 J1 t
approved at the 2012 CTL Plenary Meeting( F5 O3 L& \6 A4 j4 M" Y1 ~
Question:
- |9 I- p. `9 X; Y! aWhat is the correct manner of applying the metal foil required for dielectric tests
2 j: n8 A3 q3 E$ t3 aaccording to Annex R of 60947-1?0 m, ]( T* C4 ], |* J* M
Rationale:
" K" N" A) Z1 `( iAnnex R of 60947-1, subclause R.2.2, gives instructions for the geometrical zones,% e ]4 w" `& X% H+ B2 [7 c
where the metal foil shall be applied. The examples in Figure R.3 have often been a8 R# {, W# a% T' g
cause for discussions between test laboratory and customer as to which surfaces
! E5 ^- B2 G. Q5 v' m$ h9 o4 U @( Tshall be covered and whether or not the foil may come in contact with hazardous-liveparts
5 a5 I" p, ]' ~(e.g. terminals and connected conductors) located in these zones.' f6 `, G# V& q/ v& _* @, l
The text of R.2.2 clearly states that all surfaces within the defined safety zones shall1 U/ |$ P, {" ^* Y# u( ?
be covered by the metal foil regardless of the orientation, unless the manufacturer
4 D- H' w* X+ c, }( {provides specification for mounting or the use of additional enclosures preventing
+ K0 W1 z1 }3 R7 n7 P) P- H! waccess to these surfaces.* a) J, W! B$ \( `) h4 U- Y
The guidelines not only state that the foil shall not be depressed into holes but also
9 l5 e' J1 ]! V3 eindicate that this requirement shall be applied to holes, where the test finger cannot E7 B$ x; l' A/ y0 j8 F/ D
penetrate (see note to figure R.3). This might be interpreted to the effect that the foil+ Y6 a0 S" |" _9 A. _
shall be adapted to outlines of the device forming cavities with diameters larger than
* N# A+ f1 p" `( ^- \12.5 mm, according to the shape of the test finger.4 D) X' n7 A% Z( l. p
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发表于 2012-11-7 18:37
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