DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590   p/ a7 v# B$ E- x4 z

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

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) , f$ a6 M0 S8 \; x

Standard: IEC 60664-1/1992
' j  P. m, l  _& B3 U. @IEC 60335-1/2001
+ C, P3 c7 T8 a* |+ M, e! f" bIEC 61010-1/2002
IEC 61058-1/2000
2 H6 X* U- i" U. BIEC 61008-1/2002
2 V( h4 Z' @& F6 e; wIEC 60947-1/2004
IEC 60598-1/2003
/ b. u) {. ~, J$ a9 X2 nIEC 60065/2005
IEC 60950-1/2001
( b' S9 @& X& n3 L( OSub clause:
* R8 }7 g- Z5 W! r& P. u: y- ESee Table below
, s4 P0 U  j- P4 R3 fDSH N°: 590
Page: 1(1)
) t6 n( _0 Z; F6 l% _$ e0 r6 bSubject: Rule for creepage across
2 O/ E' U4 W9 D+ ]4 ]# ogrooves and similar
surface discontinuities
Key words:
. f/ N1 R, t! u$ `6 l" _- Creepage
- Grooves
, }5 x6 [/ j: R2 w9 E- Conducting path
- Shortest distance
- Through air
2 c  J8 E8 K+ E* t: k# zDecision approved
& i. Z+ G$ ~; H- _3 b! j7 d6 G! l  r( fby the CTL during
* W% [: i4 i$ y/ o; Vits 43rd meeting in
Johannesburg
+ q0 U; J2 w: C. ]Question: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
. m6 V+ H/ B0 r+ K% rwith angles greater or equal than 90 degrees are not bridged. IEC 60664-1 does
& o/ u, e) b- x% V8 snot contain specific information at which angle less than 90 degrees bridging
/ Z. _2 u$ _6 f3 Lshall be applied. Some of the above mentioned standards specify that bridging
2 c$ c: r' `8 f! t+ T% ~9 `shall be applied for angles less than 80 degrees.
Can this 80 degree rule be applied in general for all standards?
: c) \4 [% `6 YDecision: Yes. The 80 degree rule shall be applied in general for all standards.