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

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) " S$ r* \% j( J1 v

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9 V1 o* k$ I: F7 [* NStandard: IEC 60664-1/1992
IEC 60335-1/2001
) T+ a4 m/ o" q4 zIEC 61010-1/2002
" Q( f. M" G- P7 R5 O8 m$ e/ hIEC 61058-1/2000
IEC 61008-1/2002
IEC 60947-1/2004
IEC 60598-1/2003
IEC 60065/2005
IEC 60950-1/2001
$ q3 @+ o9 t) ]: M6 xSub clause:
See Table below
DSH N°: 590
Page: 1(1)
Subject: Rule for creepage across
0 L- ^& z) V. {; y( ]  ], Tgrooves and similar
  c; ~8 G' ]. X7 v) X, \4 \surface discontinuities
Key words:
- Creepage
$ Y" n" R9 @, r& [( s- Grooves
  h/ A6 N" N% p/ }  o& m. ?- Conducting path
' u/ J$ Z/ W2 S, O- Shortest distance
& n# T. ^, G9 Q- N6 B- I; h- Through air
8 f, j9 F  F3 }Decision approved
7 P1 P% d# D8 c$ `" q! P% ?by the CTL during
its 43rd meeting in
Johannesburg
' P1 n: `! X0 @9 @9 X8 I+ _Question: 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
shall be applied. Some of the above mentioned standards specify that bridging
4 w; V: ?1 n% M/ @& C7 a8 j. l' {shall be applied for angles less than 80 degrees.
% }$ S. m  K* R; D% |4 ZCan 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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