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 0 A; b0 b5 V6 I' R0 B

4.2, 6.2 $ Q/ ]; n6 C+ p( Q# x: R7 S5 D( C

60664-1(ed.1.2) & 60065-1(ed.2) & All equipment standards based on these ; e. h" ~. i' Z( N9 b  Z! O

Standard(s): No. Year
IEC 60664-1/2002 ed1.2
$ H' l% ], D/ m, f' t4 r! s( WIEC 60664-1/2007 ed2.0
All equipment standards
based on these
DSH
, M, v4 F0 R$ s( O9 D0717
2 b  Z2 Z3 `5 p" f- {4 W0 u4 F6 ]2008
4 i3 ^. S( O0 A" n; @& z1 ICategories:
# b: h2 P6 ^; E8 GVarious, General
6 W# B& u- J% M7 PSubclause(s):
4.2
6 j( [' O( r7 p+ w) Q6.2
Developed by:
WG2 - WG4
Subject:
Creepage and clearance
' N# m# F! n& t( f6 T1 m  Qdetermination, groove,
recess, corner, bridging
of distance X
# I$ i7 j3 Q$ Z, i9 bKey words:
- Creepage
9 _2 g- S  K8 ]* y2 M; R; H0 S- Clearance
- Groove
# A: i% l+ w6 A" l  z- Recess
- Corner
; U6 w5 |- {& a# j! B* ?- Bridging of distance
/ T: |) D: o4 f8 ~9 AX
Decision approved at the
2009 CTL Plenary
Meeting
Questions:
0 B/ y! L! G4 d1) How shall the examples given in IEC 60664 be interpreted for intermediate situations?
8 x& [% y. G4 j/ @2) How shall the example given below be judged correctly, based on the examples given in
) ?9 R1 o( V2 A. a1 iIEC 60664-1 and based on the assumption that X = 1 mm?
0,8mm
2 mm
PCB
! `5 K8 B3 M; [+ e1 }PCB-Track (ending on the
" w  r4 L/ M' R$ S: P! d5 b! F' U6 eedge of the cut-out
7 B. P6 `0 {# v& |( }) P! d0 G3) When shall the sentence:
! C  T& I* {, R" L% _3 T0 u( t“If the associated clearance is less than 3 mm, the minimum dimension X may be reduced to
one third of this clearance.” be applied?
% R% Y" Y  s* y4 R! y3 iDoes this sentence refer to the actual clearance measured or to the minimum clearance
required?
Decisions:
" V/ Y; ^' G1 c8 \! B5 K; `Ad 1)
$ i" t5 w% k5 |9 `3 F1 H2 X0 mAn 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
4 N; s9 l+ \$ nof the methodology is given in the Explanatory Notes to Question 2."
- D, E; J7 ~. v. ~5 kAd 2)
5 w! k5 p% B/ y. pThe example shall be judged without any bridging of the corner in the cut-out
- m  |1 u7 T3 u  \" @1 L
creepage = 2,8 mm, no shortcut applicable.
* ]3 W: ^$ C+ f( YAd 3)
4 x; Q5 G9 T# y) y" pThe sentence shall always be applied whenever the required clearance is less than
  u+ |& F1 d* S. D' E+ C0 r+ x3 mm and the allowed reduction of the minimum dimension X shall be referred to 1/3 of the
required minimum clearance.
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