DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 9 k- W5 s6 ]4 d* C* M

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)

1 P/ z' D! H4 v+ ^* B4 w/ ?' gStandard: IEC 60664-1/1992
IEC 60335-1/2001
" b; G; J0 Q7 V9 b9 w# XIEC 61010-1/2002
IEC 61058-1/2000
3 S8 ^6 S9 I$ ^5 R6 @/ nIEC 61008-1/2002
IEC 60947-1/2004
IEC 60598-1/2003
IEC 60065/2005
" r, F% y5 b8 R2 oIEC 60950-1/2001
Sub clause:
# p8 c" p- H! R. w6 XSee Table below
* N) F/ X. r9 _5 k3 t, tDSH N°: 590
Page: 1(1)
Subject: Rule for creepage across
5 M. y- t, q4 jgrooves and similar
% Q- t3 b' r9 _surface discontinuities
' H2 U/ M4 s. M4 r/ UKey words:
- Creepage
6 N  ~1 \3 J3 L' X- Grooves
, M( Q2 ?2 M8 j# j/ {8 H- X- Conducting path
, A4 h; X/ a, X4 z- Shortest distance
4 y. }) M- M' X, u9 X8 m& `2 Z- Through air
Decision approved
by the CTL during
  ?+ T; J! a) e$ nits 43rd meeting in
Johannesburg
: M/ ~. g& m: ZQuestion: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
8 ^/ ^3 J8 g: K/ p1 ]with angles greater or equal than 90 degrees are not bridged. IEC 60664-1 does
( u. {# r* X  H% pnot contain specific information at which angle less than 90 degrees bridging
# `, [1 ?* X7 V2 S! h5 v( ]" K* ashall be applied. Some of the above mentioned standards specify that bridging
shall be applied for angles less than 80 degrees.
8 H, t# H0 G; ]/ |Can this 80 degree rule be applied in general for all standards?
+ s! j6 o( h  V# ADecision: Yes. The 80 degree rule shall be applied in general for all standards.
# M: T% c3 x- a' |" H' {0 \

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