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[Various] DSH 717 Creepage and clearance determination, groove, recess, corner, bridging o

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发表于 2012-11-8 21:02 | 显示全部楼层 |阅读模式
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本帖最后由 小米 于 2012-11-8 21:04 编辑 0 s1 q0 T( L3 w; X- Z
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DSH 7178 ^/ q! S6 ^, O: b
Creepage and clearance determination, groove, recess, corner, bridging of distance X
$ x7 K: p$ d- j- h2 Y
4.2, 6.25 Q, ]* L: A1 r' m
60664-1(ed.1.2) & 60065-1(ed.2) & All equipment standards based on these
+ J3 e+ [/ V# J0 q

; v  P; ?; ?$ TStandard(s): No. Year
7 }$ H8 ~7 B! B* F, M. @IEC 60664-1/2002 ed1.2, ~) {4 P* d8 I6 B+ |5 N0 l7 x: C
IEC 60664-1/2007 ed2.0
5 ]# m8 G' w, H9 `. bAll equipment standards8 q8 K9 S" \) O  |9 S# i
based on these
' d* |, C+ h  v8 f  ]DSH3 E+ o. m8 K& k( k
0717
4 E' U" |& H$ ^1 O2008" i# B9 _1 m# g6 s
Categories:  w! A! f# k( M5 T7 W. j+ E4 f
Various, General6 h1 S) z6 |$ {: ^9 O# E
Subclause(s):
2 q+ T2 ?0 ]5 A4 g3 _. ~4.2
4 Z) {+ o8 A5 g/ A6.2
5 l' Q0 p- F2 C6 x6 {3 `( VDeveloped by:" C" T" F6 z- X* p% [& j
WG2 - WG4
: d4 |8 ~6 H" M5 A% w( cSubject:6 w+ ?2 k+ I+ [2 p8 t
Creepage and clearance8 c; |0 z. i9 u! Z+ o' {) M
determination, groove,
; s8 k; N* W9 X; n7 f$ ?recess, corner, bridging
$ F) M, Y- E5 dof distance X
/ [* ^( |4 W  ^6 `Key words:& U( w3 W/ ]) ^1 Z6 v7 O: W
- Creepage
1 P5 Q: D& L2 `- Clearance
9 V% J+ e. H8 {9 y- }- Groove1 W4 r1 ]6 [/ S  I; G. j( ^. P' D* r
- Recess
3 d2 X9 R2 c" e, n1 j, g- Corner
+ J& ^( r8 G" r6 d- Bridging of distance( t. v: s6 v) H. ^$ m
X
# X6 I# I( l3 N& s2 A' E- FDecision approved at the
' `3 t7 j9 u( u! \6 T% A2009 CTL Plenary4 Q% \! {. U+ v; E
Meeting" l7 W) X( H- S  P. m% o+ I" C
Questions:
1 [1 G2 `3 n; ~( X) R; f" W# H, a1) How shall the examples given in IEC 60664 be interpreted for intermediate situations?  H4 t# p2 p" M6 c3 g" Q' ]: m
2) How shall the example given below be judged correctly, based on the examples given in! W1 a6 |! y7 n4 r; V+ E' `
IEC 60664-1 and based on the assumption that X = 1 mm?
" {: l* y* T0 ~/ V5 T1 S& n0,8mm
$ f2 Z  n3 h1 g6 g9 d' W4 V9 o2 mm0 N6 z0 E2 \  i$ T! s; p7 P
PCB
+ D- u) V+ N( P% u. F' v+ B7 l  pPCB-Track (ending on the1 k1 K( k" i& ^5 x' B" f# C# `
edge of the cut-out( O- p8 j' T9 {1 q
3) When shall the sentence:
; a8 @- x7 Q' ]4 \$ Q“If the associated clearance is less than 3 mm, the minimum dimension X may be reduced to
! ^$ ~- k, d5 x6 Q- u6 rone third of this clearance.” be applied?3 D: v! Z4 x( `9 ?
Does this sentence refer to the actual clearance measured or to the minimum clearance! J, r5 E4 [4 G- J# e. Z) D$ g: K
required?2 a! v7 B: V2 \, [
Decisions:
: v' w3 {" `# x5 W4 p" X+ HAd 1)
2 }7 h; {" h% F, TAn intermediate situation not covered directly by the Standard shall be determined by+ ~$ `1 B+ h8 [; l6 Q( X0 w  z
considering it as an extension of the most appropriate example from the Standard. An example  s2 G- Q: Q+ `3 V5 b
of the methodology is given in the Explanatory Notes to Question 2."( i; W" N( e# i+ s
Ad 2)
3 b6 D+ p8 @4 H9 F/ Y8 [The example shall be judged without any bridging of the corner in the cut-out
& r: S( F; Z4 n7 E7 }+ k( Y0 l: i creepage = 2,8 mm, no shortcut applicable.
# o+ c9 M% k% \1 P/ o, dAd 3)6 V0 R! s3 J9 ?, D; C( C
The sentence shall always be applied whenever the required clearance is less than
% q& o* f3 g0 v7 x9 A+ f- a- Q( _+ t3 mm and the allowed reduction of the minimum dimension X shall be referred to 1/3 of the
1 k- t: O0 l* W4 R2 ^required minimum clearance.' E9 F6 P. \) t/ K+ |% L3 Y1 U

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