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

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IEC60335试验指甲

DSH 717

Creepage and clearance determination, groove, recess, corner, bridging of distance X

4.2, 6.2 ) j/ X2 M5 {  C

60664-1(ed.1.2) & 60065-1(ed.2) & All equipment standards based on these % R+ Y7 l! m: e. t- n9 J4 v) c+ O

Standard(s): No. Year
IEC 60664-1/2002 ed1.2
IEC 60664-1/2007 ed2.0
All equipment standards
8 S7 x( Q; U+ A, c# E. Kbased on these
: h; t* j0 I+ P& \8 o" i  F& BDSH
# @1 f) z- ]6 R; n) I% [- u# \0717
  G8 W* Z* p5 d2008
" b. g) A1 V: x4 R- `Categories:
Various, General
Subclause(s):
4.2
" s; U6 J$ B+ j6 S) ]% ?6.2
1 s4 l$ e4 l- N& E+ T9 i, }9 xDeveloped by:
% S* ?. M( g7 y' Q6 N/ N( sWG2 - WG4
Subject:
Creepage and clearance
determination, groove,
recess, corner, bridging
of distance X
Key words:
- Creepage
. }4 f# h9 |' _, _- Clearance
- Groove
- Recess
" ~8 r" m# c2 r( q9 c- Corner
7 R6 l' R: {: Z. {- Bridging of distance
X
6 ]& G3 F" }! f6 s& u3 \' m9 PDecision approved at the
2009 CTL Plenary
$ v, |' A9 s2 a' y2 dMeeting
Questions:
# U1 V* l- I' {3 T' Y1) How shall the examples given in IEC 60664 be interpreted for intermediate situations?
2) How shall the example given below be judged correctly, based on the examples given in
IEC 60664-1 and based on the assumption that X = 1 mm?
9 W  E- p* s  Y# M3 L+ c0,8mm
2 mm
PCB
. k- o, q& A% q% v0 e, w8 NPCB-Track (ending on the
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?
Does this sentence refer to the actual clearance measured or to the minimum clearance
required?
Decisions:
9 B% O  h& |  {( a2 l* DAd 1)
  \( @  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
of the methodology is given in the Explanatory Notes to Question 2."
  W/ \8 M& m( c- R4 x* g( XAd 2)
: 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.
+ _3 N( {4 T! u9 w( yAd 3)
+ `6 [1 w# M' Q, E; l2 zThe sentence shall always be applied whenever the required clearance is less than
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.
& f6 f" f4 C: u  o9 U
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