DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 7 |* E2 d5 e$ ~5 ]

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 ; d  o5 f9 b4 B+ P' R- ~! i8 x

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) 1 |- d9 h3 j3 @1 r

6 S8 |+ P: y" @/ OStandard: IEC 60664-1/1992
) j5 M; n5 X$ i# p( M, ~; l$ _+ QIEC 60335-1/2001
! ^, @1 L+ n# k' dIEC 61010-1/2002
IEC 61058-1/2000
: }  c+ R1 H$ A* ]- v' K! tIEC 61008-1/2002
IEC 60947-1/2004
IEC 60598-1/2003
IEC 60065/2005
$ Q1 Q/ Q" k( l, e! vIEC 60950-1/2001
Sub clause:
See Table below
* B6 _4 n3 V3 WDSH N°: 590
Page: 1(1)
Subject: Rule for creepage across
grooves and similar
9 L6 p, D$ V5 N* I' U$ ~0 e; qsurface discontinuities
/ t& f; N7 {9 X# @Key words:
  P- c3 o* P  a. j$ _- Creepage
: Y" t; r; O; C+ F( u& B- Grooves
- Conducting path
- Shortest distance
- Through air
( I! O6 m1 r1 p9 wDecision approved
6 m9 d( f0 c" \/ P# lby the CTL during
* O) |6 t$ u9 y+ ?  `its 43rd meeting in
1 D8 c" v& ~& b# ?* @( Q. e/ x- }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
- M, R+ j% U+ Y' rnot contain specific information at which angle less than 90 degrees bridging
shall be applied. Some of the above mentioned standards specify that bridging
$ c; M' a1 n# E# y7 \shall be applied for angles less than 80 degrees.
Can this 80 degree rule be applied in general for all standards?
+ N& [9 _' o9 [% \9 S0 xDecision: Yes. The 80 degree rule shall be applied in general for all standards.
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