DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 6 w; N; n; L; y+ r" k8 G( ]

Rule for creepage across grooves and similar surface discontinuities " U( X. w  y7 W1 X1 F& U! m0 z8 Z

IEC60664-1: 1992 cl. 4.2 IEC60335-1: 1991 Annex E IEC60335-1: 2001 Cl. 29 IEC60730-1: 1999 Annex B IEC60950: 1999 Annex F IEC60950-1: 2001 Annex F IEC60065: 2005 Annex E IEC61010-1: 2002 Annex C IEC60601-1: 1988 Notes Figs 39-47 IEC61558-1: 1988 Annex A IEC61058-1: 2000 Annex A IEC60598-1: 2003 - IEC60745-1: 2001 Annex A IEC61008-1: 2002 Annex B IEC60947-1: 2004 Annex G

60335-1(ed.4) & 61058-1(ed.3) & 60598-1(ed.6) & 61010-1(ed.2) & 60950-1(ed.1) & 60947-1(ed.4) & 61008-1(ed.2);am1 & 60065(ed.7);am1 & 60664-1(ed.1) + R- L  `; i3 ]6 c

# x. N9 u9 ^* ^8 N( `# vStandard: IEC 60664-1/1992
8 k# ?- g4 D- d, a, S# cIEC 60335-1/2001
IEC 61010-1/2002
IEC 61058-1/2000
IEC 61008-1/2002
6 _, p& U1 ~4 k1 o; @' u6 {# _IEC 60947-1/2004
IEC 60598-1/2003
1 T! s( Q( Q  P7 `9 G; gIEC 60065/2005
  ?7 a8 R" v$ z+ `, ^+ h6 P. lIEC 60950-1/2001
1 T: B+ k' w, ~8 sSub clause:
, i- I' B8 X+ r. b' E0 ISee Table below
: p& g6 o8 \' U% u5 o! S6 T) |; MDSH N°: 590
; b& L* T. u$ MPage: 1(1)
Subject: Rule for creepage across
7 w( j  `1 b/ C& W2 y$ k: f6 Ogrooves and similar
* i7 S  M9 E: u- B7 p. nsurface discontinuities
6 ^" J: Q4 b7 }: A: [5 tKey words:
- Creepage
  W2 q1 k, V+ T+ U# t9 ~, D4 L- m- Grooves
- Conducting path
- Shortest distance
$ M% ~) T) |8 s& d; M% b3 h- Through air
Decision approved
by the CTL during
) P. v/ u5 ^: ^' v$ }' Oits 43rd meeting in
* J! v5 N0 f! Y: [# oJohannesburg
0 z  U0 {2 @6 H- S( t6 c, OQuestion: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
4 i( m) q: y) [with angles greater or equal than 90 degrees are not bridged. IEC 60664-1 does
4 _' Q/ x7 r# Y5 {' M) ynot contain specific information at which angle less than 90 degrees bridging
+ X! m" W( r) m+ i) Gshall be applied. Some of the above mentioned standards specify that bridging
shall be applied for angles less than 80 degrees.
6 y% s5 c$ m6 j& N* H0 s3 }: kCan this 80 degree rule be applied in general for all standards?
Decision: Yes. The 80 degree rule shall be applied in general for all standards.

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