DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 : p& U! E+ ~* U3 R( x

Rule for creepage across grooves and similar surface discontinuities ( G1 z* u9 g$ B$ {

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) + W6 l+ v. B( F% [/ q

. R  h5 p5 `* oStandard: IEC 60664-1/1992
7 t+ e' b3 K7 l4 xIEC 60335-1/2001
" |. F$ N6 j* s/ WIEC 61010-1/2002
IEC 61058-1/2000
IEC 61008-1/2002
8 u  T0 H' S* N- i& M  }' W4 GIEC 60947-1/2004
IEC 60598-1/2003
  p+ u; r1 Q: U. h6 Q+ o, r. CIEC 60065/2005
  U3 b; o3 X- e) c2 cIEC 60950-1/2001
  g# p1 X+ n# |4 ]4 G& ySub clause:
$ Y3 w! G& x% r5 X; gSee Table below
$ d) C) T5 L) `- ~DSH N°: 590
Page: 1(1)
Subject: Rule for creepage across
) m& E: G% }! ~* E! z) M" A$ A8 Wgrooves and similar
+ Q! n2 p8 D* A' m0 ?* d5 Ksurface discontinuities
) z, Z7 W* m. s4 KKey words:
- Creepage
+ y; B3 k% l5 N5 a+ F# n- Grooves
- Conducting path
- Shortest distance
- Through air
Decision approved
6 a4 O1 g: E7 R7 ?7 Z- W7 jby the CTL during
its 43rd meeting in
( v6 N% T3 M9 G& U/ i; v8 K2 ]* eJohannesburg
, d1 G3 i$ u5 E8 fQuestion: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
+ A9 i0 P. i* u% o2 e/ p3 gwith 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
/ L. h7 c1 I; h; m# ]5 [9 Nshall be applied. Some of the above mentioned standards specify that bridging
. ]; f2 ?( g& ?/ t. Q9 x0 Q4 mshall be applied for angles less than 80 degrees.
Can this 80 degree rule be applied in general for all standards?
8 L9 P# c1 t+ v& qDecision: Yes. The 80 degree rule shall be applied in general for all standards.

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