|
|
本帖最后由 小米 于 2012-11-8 21:04 编辑
$ _8 W! n: R5 V6 V, b
1 {- {* O1 x/ w | |  DSH 717! O: K, D8 z7 {' w6 R
| Creepage and clearance determination, groove, recess, corner, bridging of distance X$ k |+ E% | D* t! ]- b
| 4.2, 6.2
/ z- Z4 I! M& \8 h$ | | 60664-1(ed.1.2) & 60065-1(ed.2) & All equipment standards based on these
( c5 i T+ D* a i |
% Q6 j. F* B( y0 O
Standard(s): No. Year* i; F, q6 t- S. g; j: C
IEC 60664-1/2002 ed1.24 K2 Q7 S3 x5 c" F" v- b6 m
IEC 60664-1/2007 ed2.0
+ i& ]7 G( J" ]9 O9 k3 ^5 G9 K: d, W6 WAll equipment standards* E# U |" z7 ~. ?% a7 r
based on these! M. M, P4 [/ T, ^6 {" x
DSH
) l, ?6 A( x, C0717! Q1 g/ g4 B+ D- M8 d: [
20082 q3 R1 X H+ c8 `( ]
Categories:3 H% p L) `/ { Q4 l+ n
Various, General
9 }+ ~/ @: k5 Z5 F' t, u" E' A6 TSubclause(s):5 X2 L0 {" C6 {
4.2
: h: V: b. I _$ R( x6.2" l; n" k2 I8 r% q) i/ z
Developed by:
- q" ?; z: F- I9 i1 UWG2 - WG4* @% F" z5 L8 Q; {1 M9 l: V
Subject: j& H% w, X& x5 |0 ]6 J
Creepage and clearance4 g9 [+ [; `0 m( t7 F. z
determination, groove,3 i" T" _2 J, l/ s
recess, corner, bridging
; ^5 R- k% \) Q1 X. o: ?of distance X2 i+ W9 c6 j5 n& r8 {) C
Key words:
: Q1 |) w; a7 Q8 n$ d- Creepage) v# c$ `& x( R2 @" L! Q1 U6 }
- Clearance
2 a* m7 o {1 g+ k; q0 v- Groove$ ]. _; U, W9 O, L, c( V
- Recess K: I, R; ~. J: `3 F
- Corner8 a/ U u/ K/ {# ^% ^
- Bridging of distance$ T, l9 |% [) M
X- X4 m# R! Y! z, N
Decision approved at the
$ ]. y0 h- O" Q2009 CTL Plenary x! q9 M6 u) V' t7 _8 V) f+ f
Meeting7 t6 S7 y8 ]* i5 |1 K
Questions:
L9 R. n0 I# Z; h0 Z6 ^3 W# G2 N1) How shall the examples given in IEC 60664 be interpreted for intermediate situations?
8 Y& E- C, @/ t2) How shall the example given below be judged correctly, based on the examples given in
7 s$ z6 {+ i# V N4 q+ b% c2 @IEC 60664-1 and based on the assumption that X = 1 mm?, D0 M* l% {8 S: t9 z/ C, A5 J
0,8mm
$ ]9 U7 g) t7 B) G9 X2 mm. X- x/ p, O; J- x) S. M3 ^1 ^
PCB
7 \% y# p/ v0 t3 z/ k7 d. gPCB-Track (ending on the# r" N! u/ r, R
edge of the cut-out
* v8 {+ W' p6 X: P& l! i3) When shall the sentence:* u1 e9 p% d5 k2 C& Y: f
“If the associated clearance is less than 3 mm, the minimum dimension X may be reduced to& Y; m6 R4 Q+ q" p& U- M" W9 L
one third of this clearance.” be applied?7 a& {5 l' P3 q. I4 _4 E/ `
Does this sentence refer to the actual clearance measured or to the minimum clearance
' I, [7 e% o" f* f2 h; irequired?
' ?& Y3 X; q; \Decisions:" w4 c0 Q V, q( Q5 r1 _% {0 `
Ad 1)
8 e: P4 r' O! C9 \+ A6 t. gAn intermediate situation not covered directly by the Standard shall be determined by
& c: c1 U' ^* W/ W( Kconsidering it as an extension of the most appropriate example from the Standard. An example
# [( S: r5 r: uof the methodology is given in the Explanatory Notes to Question 2."$ g7 R1 z% s/ T5 K6 Q6 S: I. q
Ad 2)
' |0 i! H9 }, D; ?The example shall be judged without any bridging of the corner in the cut-out
; i8 l) D. [ s ^) e; N creepage = 2,8 mm, no shortcut applicable.+ e: |3 _9 I8 O8 a' d" o
Ad 3)+ P# f, y/ |. {; Z2 ~% L: L
The sentence shall always be applied whenever the required clearance is less than/ [; C4 _& d+ [3 K7 J9 _ [ N
3 mm and the allowed reduction of the minimum dimension X shall be referred to 1/3 of the* P$ \' c+ |: u# Z
required minimum clearance.
9 I; I% a% v, D9 H; n
$ H2 U: l$ p: z |
本帖子中包含更多资源
您需要 登录 才可以下载或查看，没有账号？注册安规
x
|
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2012-11-8 21:02
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡
