DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 ; J% h3 A1 d) k8 D% ]7 u* V  n $ e6 d" o  K# j* B

Rule for creepage across grooves and similar surface discontinuities ! K( U* f; Z7 P8 s3 j! P, A, p

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 % s# E; _: }0 E' Y  C

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) 7 W" N, x; n9 c0 Z2 K% s$ H, M

Standard: IEC 60664-1/1992
IEC 60335-1/2001
IEC 61010-1/2002
IEC 61058-1/2000
IEC 61008-1/2002
5 B' H, q5 E8 g+ C) @IEC 60947-1/2004
- ]2 k# T# ^7 BIEC 60598-1/2003
2 ?7 O) i- v8 x* Y+ ZIEC 60065/2005
3 G  ]9 T% p. v, }" ?- dIEC 60950-1/2001
Sub clause:
4 [( W; v! i2 \* I7 m! N  b0 W" eSee Table below
9 S& L. [0 p* {% tDSH N°: 590
Page: 1(1)
Subject: Rule for creepage across
& F; ~! s* ?0 R" |8 q: Y3 Igrooves and similar
, C. X" `7 D9 \+ c' }1 hsurface discontinuities
Key words:
- b- O) t, d) @- Creepage
- Grooves
" C, g) j8 S4 B0 k0 `) T- Conducting path
- Shortest distance
- Through air
0 L2 {. V, M  L' VDecision approved
by the CTL during
its 43rd meeting in
Johannesburg
* b2 @) @6 e7 Z& RQuestion: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
' n! Y& p5 Z6 x4 dwith angles greater or equal than 90 degrees are not bridged. IEC 60664-1 does
; v% [0 t$ ^5 J) _not contain specific information at which angle less than 90 degrees bridging
shall be applied. Some of the above mentioned standards specify that bridging
shall be applied for angles less than 80 degrees.
' _) Y9 ]1 E9 P6 r. s' O& @Can this 80 degree rule be applied in general for all standards?
$ W/ `. Q5 [# o+ ^Decision: Yes. The 80 degree rule shall be applied in general for all standards.