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

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DSH 717

Creepage and clearance determination, groove, recess, corner, bridging of distance X 9 Y" c  [7 p( {& N: H

4.2, 6.2

60664-1(ed.1.2) & 60065-1(ed.2) & All equipment standards based on these

Standard(s): No. Year
% `; k& }3 }5 b7 O/ XIEC 60664-1/2002 ed1.2
8 ~; f& c9 j! c0 Q# eIEC 60664-1/2007 ed2.0
( ]7 {1 P9 p, P, L7 j$ X* {" LAll equipment standards
based on these
& l9 d0 `3 }. GDSH
0717
2008
! H! ?) d1 b4 a8 V1 wCategories:
1 o7 h. i! C* I- Z7 s& XVarious, General
* I6 Q- Q- R5 a4 a! `/ |* zSubclause(s):
# D0 r$ }! x1 m  k5 n3 S4.2
6.2
Developed by:
WG2 - WG4
Subject:
( u8 i- h* W; S8 U, {5 iCreepage and clearance
  S4 h! e( G6 n1 _6 Odetermination, groove,
recess, corner, bridging
of distance X
Key words:
- Creepage
- Clearance
7 ?+ A9 r! ]4 g$ e$ l- Groove
+ m8 G! Q. v; t& D. h- Recess
) W) q/ _+ Z1 ]8 h! I# T1 I- Corner
# I6 Y, e/ y9 u; R% v/ Y  j& ~- Bridging of distance
X
% {, t7 @. k, S: lDecision approved at the
2009 CTL Plenary
& M& K2 p3 g: F5 S9 @6 _Meeting
4 [! U  Z" K. S+ k# v. YQuestions:
7 M( {8 c8 @8 f1) 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
0 o# F" S( a# `1 c9 @+ [% Z4 s3 }IEC 60664-1 and based on the assumption that X = 1 mm?
0,8mm
1 x6 @$ p2 u! H  N# |2 mm
5 p+ `& ^! {& ^' g% W& t" ?PCB
PCB-Track (ending on the
; W" ^' ~/ c& D$ \4 kedge of the cut-out
/ P' C) A% c/ U: n! b" A5 ?0 ^1 P3) When shall the sentence:
. _* {. x" l# [4 O* U( _% @7 A“If the associated clearance is less than 3 mm, the minimum dimension X may be reduced to
one third of this clearance.” be applied?
& V, I2 w2 c% \  k+ S+ i! h& FDoes this sentence refer to the actual clearance measured or to the minimum clearance
# j$ m/ Z1 }4 G; v6 l  Wrequired?
Decisions:
Ad 1)
An intermediate situation not covered directly by the Standard shall be determined by
considering it as an extension of the most appropriate example from the Standard. An example
! {9 b# u+ D& jof the methodology is given in the Explanatory Notes to Question 2."
Ad 2)
The example shall be judged without any bridging of the corner in the cut-out

creepage = 2,8 mm, no shortcut applicable.
- C0 X1 y5 L: T1 ^- E; MAd 3)
' [1 n# U+ w; j9 C7 p: A+ aThe 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
required minimum clearance.

& ]7 s' @/ l$ V  W- @! ]+ k; V4 ?3 W