DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 ) j9 t$ z; v5 {3 _& E  F" O / l8 M- D* P$ g; q8 E

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 & D$ _6 n% c* D0 o; B, q

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)

( f3 ~7 N0 k  _" T; hStandard: IEC 60664-1/1992
IEC 60335-1/2001
' ^3 H- q. h3 iIEC 61010-1/2002
% g" B# L7 u9 v/ j3 {IEC 61058-1/2000
IEC 61008-1/2002
0 i6 ?) Q+ T& J- Z# g6 h! xIEC 60947-1/2004
IEC 60598-1/2003
- u( X3 ?% C* x8 z0 N" NIEC 60065/2005
IEC 60950-1/2001
Sub clause:
See Table below
" ?4 R: _1 d2 y1 H, Z0 lDSH N°: 590
Page: 1(1)
& ?& Y9 x7 @2 JSubject: Rule for creepage across
% d- N3 `0 x9 e, ^grooves and similar
, ~% c4 f- j+ _9 s8 K" K/ s$ D2 M: j5 psurface discontinuities
- G2 k: L7 _; f7 S: g; SKey words:
% }  l! n5 d) D: ]& D- z5 y( I( i- Creepage
- Grooves
) N- J2 n* f, c6 Z+ |$ r  e/ @- Conducting path
- Shortest distance
- Through air
& h5 h% p2 G! y4 @1 b& |Decision approved
by the CTL during
its 43rd meeting in
4 E8 ^9 x8 V$ _! ?Johannesburg
Question: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
with angles greater or equal than 90 degrees are not bridged. IEC 60664-1 does
. i/ K- D$ i$ wnot contain specific information at which angle less than 90 degrees bridging
shall be applied. Some of the above mentioned standards specify that bridging
" r/ y; |: c% R% |shall be applied for angles less than 80 degrees.
Can this 80 degree rule be applied in general for all standards?
! T# ?' Q3 S6 A' wDecision: Yes. The 80 degree rule shall be applied in general for all standards.
7 \$ U5 M6 T" _% U; |; o5 e+ C
/ u. w0 Z2 g% d4 s4 r# X. o  C