DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 * h, j( r# C1 D9 ]. b$ m* D* j) S0 }$ M

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)

Standard: IEC 60664-1/1992
" k  G  X3 x  @, p. H1 g5 OIEC 60335-1/2001
IEC 61010-1/2002
6 H4 t# c  Q  X- L8 cIEC 61058-1/2000
& ~$ H4 z/ _! Y- q. C* SIEC 61008-1/2002
- @0 Y) H- ~  Z. B7 CIEC 60947-1/2004
$ G# s: A+ V4 B4 S; q; Z$ W4 tIEC 60598-1/2003
IEC 60065/2005
IEC 60950-1/2001
Sub clause:
See Table below
DSH N°: 590
Page: 1(1)
Subject: Rule for creepage across
  y4 c' R1 y# R# Q2 H; D4 Jgrooves and similar
# R9 N! d# `3 z3 Z. Isurface discontinuities
6 O6 g% h+ E# p* B. x' XKey words:
- Creepage
+ t# l) W7 h9 S- Grooves
- Conducting path
& D( k6 X6 b2 x  p! C' A  Z  u- Shortest distance
- Through air
Decision approved
$ l, p/ D* D& @by the CTL during
its 43rd meeting in
$ j& l# z2 j( t, y- h- }Johannesburg
; N+ l6 Z3 ]& r$ f* y2 ?Question: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
; y  g/ u( O* w% P0 J$ Z: [* ?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
2 s. U; ~, S. r- U9 }8 ^8 fshall be applied. Some of the above mentioned standards specify that bridging
% t, {- o; p' U$ o' p2 c+ z5 u- O5 Qshall be applied for angles less than 80 degrees.
  W$ s8 n2 b" X1 a! ICan this 80 degree rule be applied in general for all standards?
4 N8 F: s4 Q! x& Z6 K7 [Decision: Yes. The 80 degree rule shall be applied in general for all standards.

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