DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590

Rule for creepage across grooves and similar surface discontinuities 5 D& ^$ f, a* z# l( o* [

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) , u# X4 J' M! @4 X

Standard: IEC 60664-1/1992
7 c$ p6 \  x; l* D0 h( j+ Y' lIEC 60335-1/2001
2 j& Z7 J- p; ~IEC 61010-1/2002
IEC 61058-1/2000
IEC 61008-1/2002
/ q3 y. t9 H- F& ^/ o+ ^. g3 bIEC 60947-1/2004
/ C5 T0 U* l! eIEC 60598-1/2003
IEC 60065/2005
IEC 60950-1/2001
, V, Z% I; K" v% d* o# H& X1 FSub clause:
3 I7 D/ g$ y* A1 G% z) dSee Table below
DSH N°: 590
; ^$ Z1 p9 P  V' h; bPage: 1(1)
* \0 i$ g* k0 A( b! lSubject: Rule for creepage across
* Y# g, y3 q' a% P( n8 o8 A. p; Dgrooves and similar
; q% N" p& y$ B' H3 n' msurface discontinuities
: }( n0 `! K# JKey words:
+ u% b- e) k# \1 v" n/ q. h4 r" T- Creepage
0 M2 U9 L% A! y  L2 _* \3 ?- Grooves
0 h6 w$ {& {8 J4 t, C' }- Conducting path
- Shortest distance
- Through air
2 x/ h) F  A' F4 \0 B) t  W/ SDecision approved
by the CTL during
its 43rd meeting in
4 L' o0 t/ Y% |$ nJohannesburg
- d- t2 r$ {7 e8 T0 A! ZQuestion: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
with 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
% d  L: ~7 _; C- m* oshall be applied. Some of the above mentioned standards specify that bridging
0 _3 T# e& h3 L: U2 cshall be applied for angles less than 80 degrees.
Can this 80 degree rule be applied in general for all standards?
/ a' q; p1 l# }$ `7 qDecision: Yes. The 80 degree rule shall be applied in general for all standards.

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