DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 ) U7 w$ s; ]- w& ?& ?/ c

Rule for creepage across grooves and similar surface discontinuities

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 ' J" ]: d5 g9 h( Y! U/ f

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)

Standard: IEC 60664-1/1992
0 j: s: [2 [9 \/ F8 c& nIEC 60335-1/2001
' ]+ B- n) B* V2 OIEC 61010-1/2002
2 h6 t6 G+ H" {4 i( UIEC 61058-1/2000
IEC 61008-1/2002
3 f" C& u# M" Q4 Y) r) XIEC 60947-1/2004
1 i5 o/ F+ m( i$ r+ P1 xIEC 60598-1/2003
IEC 60065/2005
% k* b/ K& ]1 q: t$ pIEC 60950-1/2001
+ J! B( Y5 ^0 U0 L% c2 bSub clause:
See Table below
DSH N°: 590
Page: 1(1)
& {0 I, o* v" @& \2 u2 i( `3 O& ISubject: Rule for creepage across
; Q6 Y8 W; l1 J* @grooves and similar
* I& Q' n* o7 T* s" {3 Q' Usurface discontinuities
Key words:
- Creepage
! F  L& M- W+ A6 D% U7 q' U/ q- Grooves
0 c; R! Y' L# i! c. v, K- Conducting path
( t6 S% M. m* p) r- M4 _3 n( J$ W- Shortest distance
- Through air
8 i" R7 }  E" o; {) R0 \Decision approved
! l7 L  ?: B) j: nby the CTL during
its 43rd meeting in
" L( H" ^/ `! y& u5 VJohannesburg
Question: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
9 }  ^8 F* s( H4 A) c2 Awith angles greater or equal than 90 degrees are not bridged. IEC 60664-1 does
not contain specific information at which angle less than 90 degrees bridging
shall be applied. Some of the above mentioned standards specify that bridging
" a: {7 j/ h1 f5 s$ P7 o9 Dshall be applied for angles less than 80 degrees.
" }+ D$ v5 m! BCan 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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