DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 ' J2 k, d+ `- Y  g* R) F& X

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) - |# ~5 u" w4 g, U- J

Standard: IEC 60664-1/1992
4 C6 w: [' _' }5 W. FIEC 60335-1/2001
" w" ], Q  s. I4 c0 l$ @6 A8 a! dIEC 61010-1/2002
" F4 \0 l$ x' ?3 }5 ?0 i" c! aIEC 61058-1/2000
IEC 61008-1/2002
# c+ g0 ]6 K5 q& g. M5 h% J  l8 gIEC 60947-1/2004
IEC 60598-1/2003
3 U" z5 O( e5 n. L. lIEC 60065/2005
$ n' u, W* k- x. C& kIEC 60950-1/2001
Sub clause:
See Table below
DSH N°: 590
Page: 1(1)
Subject: Rule for creepage across
grooves and similar
surface discontinuities
9 G  G7 u! k: _( c: t6 c6 dKey words:
9 c6 }+ G' f/ ^: |  [6 s- Creepage
3 l* U  I/ S: M  b8 l- Grooves
- Conducting path
- Shortest distance
, ]' s( P$ y1 K) Q8 \9 g' f4 V2 X- Through air
Decision approved
by the CTL during
  ~, W9 ?7 p- Mits 43rd meeting in
1 l' r7 A% d% E- xJohannesburg
, j8 h+ T" V7 L6 @& bQuestion: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
7 ^! s; K& h& o- Y% O' cwith 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
) c# V! O2 K& Bshall be applied. Some of the above mentioned standards specify that bridging
shall be applied for angles less than 80 degrees.
# g$ N. e7 R" X* F7 F5 J% {Can this 80 degree rule be applied in general for all standards?
Decision: Yes. The 80 degree rule shall be applied in general for all standards.

7 Y$ u: x1 H- w* X