DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 4 i% ^& S8 r% K; x* v1 M3 J+ N

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)

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8 [" r5 t7 J6 QStandard: IEC 60664-1/1992
& S' T& L' p5 v6 R0 b+ qIEC 60335-1/2001
6 C9 P5 m6 W( L) Y/ hIEC 61010-1/2002
! o7 d  I6 H! Y" @* K& z+ u9 sIEC 61058-1/2000
IEC 61008-1/2002
IEC 60947-1/2004
IEC 60598-1/2003
IEC 60065/2005
IEC 60950-1/2001
' d6 \/ T0 W7 i, ]8 ^' TSub clause:
See Table below
DSH N°: 590
: l* o' f' |: @+ J" oPage: 1(1)
Subject: Rule for creepage across
% H, @! d% ~" k% {2 Dgrooves and similar
surface discontinuities
5 p. b. I; E( z! kKey words:
3 i4 L' F& z; v) M& g$ s/ {- Creepage
* d: `5 k6 Z* v4 n- Grooves
/ ?2 _2 Q; i  s# J) u- Conducting path
5 @9 A5 ?8 L% C7 J- Shortest distance
- Through air
Decision approved
by the CTL during
its 43rd meeting in
6 H8 Q: V* @5 l8 Z4 ]Johannesburg
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
0 v2 f7 o# A; a4 E; eshall be applied for angles less than 80 degrees.
, C0 D, b# C5 {+ `2 l4 QCan this 80 degree rule be applied in general for all standards?
( k/ D7 q4 y  O$ o& }- \) [8 Q  UDecision: Yes. The 80 degree rule shall be applied in general for all standards.



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