DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 6 m9 F7 L% W/ ^$ D, W( {6 L

Rule for creepage across grooves and similar surface discontinuities . j& j) d* D9 \1 {3 A3 L% |# N

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
& G8 D% S) h- o/ X# P7 T. ~, G7 kIEC 60335-1/2001
IEC 61010-1/2002
IEC 61058-1/2000
IEC 61008-1/2002
IEC 60947-1/2004
: O0 _" x: d5 _7 _* }, E- P# `IEC 60598-1/2003
3 u3 }  `( ]1 W8 oIEC 60065/2005
IEC 60950-1/2001
Sub clause:
See Table below
# R% J1 g- u3 R- u* k7 k5 HDSH N°: 590
% }7 h% S6 Q) _Page: 1(1)
7 O% W3 ^7 P$ h( W6 z$ a8 t% GSubject: Rule for creepage across
grooves and similar
! `0 u7 n1 C) {% W& xsurface discontinuities
" g9 d$ J  y& U0 A( [: K3 mKey words:
- Creepage
) H" b8 O* N4 }2 A# J' J  K* R- Grooves
- Conducting path
- Shortest distance
- Through air
( {: L( X9 K6 g& T  ~, R8 s+ zDecision approved
5 s- s/ c( F# |6 {5 T! uby the CTL during
# X+ I& q% F" Q& B9 X9 E7 n" I, Oits 43rd meeting in
+ a; r  M4 F+ P/ DJohannesburg
0 w- d# A- Z9 C9 c1 [  g4 \9 YQuestion: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
: |  P3 b2 F; A& _0 l; Awith angles greater or equal than 90 degrees are not bridged. IEC 60664-1 does
+ N  l; U) k) Z( X1 u9 N( ^/ Lnot contain specific information at which angle less than 90 degrees bridging
) K5 O+ g0 X/ Q' x. H) d- ]* sshall be applied. Some of the above mentioned standards specify that bridging
shall be applied for angles less than 80 degrees.
Can this 80 degree rule be applied in general for all standards?
. I+ A9 k, i0 Q4 j0 yDecision: Yes. The 80 degree rule shall be applied in general for all standards.


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