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本帖最后由 小米 于 2012-11-8 21:04 编辑 2 T2 l5 m1 c2 N4 |! L5 v+ I! V N
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| | DSH 717) t4 P; Y/ [# y- ~0 r
| Creepage and clearance determination, groove, recess, corner, bridging of distance X! g3 O4 Z( U8 ?
| 4.2, 6.2
) j/ X2 M5 { C | 60664-1(ed.1.2) & 60065-1(ed.2) & All equipment standards based on these
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Standard(s): No. Year' ^. o2 o* a+ x& r
IEC 60664-1/2002 ed1.2' k- x% v. R7 X# Y' l
IEC 60664-1/2007 ed2.0( N: f" e+ P; i% n% U
All equipment standards
8 S7 x( Q; U+ A, c# E. Kbased on these
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# @1 f) z- ]6 R; n) I% [- u# \0717
G8 W* Z* p5 d2008
" b. g) A1 V: x4 R- `Categories:- k/ y9 B. a v' N
Various, General# E: e @( v5 P) z# \3 W( e" [
Subclause(s):3 v5 l8 n! r: ~' }8 a( Z: y6 [" }3 l
4.2
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1 s4 l$ e4 l- N& E+ T9 i, }9 xDeveloped by:
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Subject:+ l$ e2 i) y$ O) P6 j' c
Creepage and clearance- G( i+ M/ H; b! R! B+ n) h; a
determination, groove,! w5 o+ _: R( m' l* S
recess, corner, bridging3 g4 l, L- E+ a0 A* M Q; P @
of distance X- d5 M1 U( D, A, |* V+ C: }; W
Key words:% F* h" V/ o8 I1 w7 q+ q1 Q! i
- Creepage
. }4 f# h9 |' _, _- Clearance- o/ m- ^' y# V5 Y2 I* Z
- Groove- d" s/ r5 ~4 m3 ^ z- u4 V( W
- Recess
" ~8 r" m# c2 r( q9 c- Corner
7 R6 l' R: {: Z. {- Bridging of distance% _% T* x4 q, ?7 @ e
X
6 ]& G3 F" }! f6 s& u3 \' m9 PDecision approved at the& M! c0 ^: H& P& j6 V! l3 p
2009 CTL Plenary
$ v, |' A9 s2 a' y2 dMeeting, ]& [1 W+ A' |* e9 g& k: X8 d* U
Questions:
# U1 V* l- I' {3 T' Y1) How shall the examples given in IEC 60664 be interpreted for intermediate situations?/ Y0 s- |+ A7 |5 u. f
2) How shall the example given below be judged correctly, based on the examples given in' \5 a }2 F* J6 R% A: E
IEC 60664-1 and based on the assumption that X = 1 mm?
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2 mm5 x- J0 O2 @, y9 ^. }
PCB
. k- o, q& A% q% v0 e, w8 NPCB-Track (ending on the" F3 v) ~6 G- M
edge of the cut-out
8 H7 D* v! x! Q4 ]+ x6 ~ X6 R3) When shall the sentence:
! w8 t2 \) J4 ]" Q X5 ?0 p! a“If the associated clearance is less than 3 mm, the minimum dimension X may be reduced to
* [2 }' T4 l/ Uone third of this clearance.” be applied?7 C7 p7 q% a H
Does this sentence refer to the actual clearance measured or to the minimum clearance R9 l" D# g5 A0 U
required?9 m- F3 p9 D0 {) _' o" ^! Z5 b5 V
Decisions:
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\( @ z' e; A# i; kAn intermediate situation not covered directly by the Standard shall be determined by
1 _1 X0 f9 s# q$ rconsidering it as an extension of the most appropriate example from the Standard. An example! X c; I3 d' \
of the methodology is given in the Explanatory Notes to Question 2."
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: a& l; I' b1 f. _The example shall be judged without any bridging of the corner in the cut-out
1 S$ [, b3 u* Y" Y: _6 _ creepage = 2,8 mm, no shortcut applicable.
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+ `6 [1 w# M' Q, E; l2 zThe sentence shall always be applied whenever the required clearance is less than+ l" F* c: R3 m! ^6 f/ g
3 mm and the allowed reduction of the minimum dimension X shall be referred to 1/3 of the
. n* E( H9 f# H7 Q+ p: Z+ Crequired minimum clearance.
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