DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 1 |2 w9 u4 s9 v7 ]$ t) r$ Q + u8 T3 V5 E  x1 q0 a0 j& {

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 & n, i+ ^6 h! M1 Y

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 @1 n5 h3 O( c, ?7 _/ U; _Standard: IEC 60664-1/1992
IEC 60335-1/2001
. U9 F1 n. @/ g5 z& d8 [; x+ \5 i& XIEC 61010-1/2002
IEC 61058-1/2000
IEC 61008-1/2002
IEC 60947-1/2004
- v7 t) t( `; G3 q1 AIEC 60598-1/2003
# l6 q* `, M. ]: nIEC 60065/2005
IEC 60950-1/2001
5 s+ [4 n8 {! E- P% v( LSub clause:
9 l. H: H  }2 V6 p: QSee Table below
' G. R, ^$ \+ _( @3 @DSH N°: 590
3 g  w4 u# L. A  [Page: 1(1)
Subject: Rule for creepage across
& ?3 f  `3 j7 ygrooves and similar
  J' ]: X0 h+ z4 d" }surface discontinuities
Key words:
- Creepage
2 S( `# m2 B6 i" ]- Grooves
- Conducting path
2 h0 B% r; J3 N* v- v- Shortest distance
+ d! W7 V* ]. ]* U* ]- Through air
# k8 Q( O7 U1 q% x  PDecision approved
9 A. O1 y+ Y8 G0 D5 }by the CTL during
its 43rd meeting in
3 g' L- w1 i3 R& i3 G. eJohannesburg
! X9 x4 V  N- _2 I0 AQuestion: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
) E1 D- ^6 P3 |3 L- _6 w' Ewith 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
; ], A% S$ \2 `9 k; Xshall be applied. Some of the above mentioned standards specify that bridging
! U% R) i4 X; [* B% N) `shall be applied for angles less than 80 degrees.
Can this 80 degree rule be applied in general for all standards?
8 l: H& a: _# y& Y& N6 XDecision: Yes. The 80 degree rule shall be applied in general for all standards.