DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 ( N: b. R( t" L$ h4 f. g

Rule for creepage across grooves and similar surface discontinuities . G3 e* c+ h: u+ b' D5 J/ C! Q& K- \

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) ( i# M9 Z0 t: T9 c

- \+ j+ n% f0 O) K% ]9 OStandard: IEC 60664-1/1992
IEC 60335-1/2001
IEC 61010-1/2002
IEC 61058-1/2000
* A" d  ]& p) Q+ QIEC 61008-1/2002
IEC 60947-1/2004
3 R7 F) P; D5 h) W) G" Q. CIEC 60598-1/2003
IEC 60065/2005
# S4 K( }3 c7 Z4 M) ]4 TIEC 60950-1/2001
Sub clause:
+ D) o( s' i/ ~& H# K% qSee Table below
DSH N°: 590
# O6 y. m1 j8 H. u) y) s& E" q! ~Page: 1(1)
Subject: Rule for creepage across
+ P  O, A$ @( h+ rgrooves and similar
surface discontinuities
Key words:
- Creepage
- Grooves
+ `) G; ^/ E! A) t0 w8 c- Conducting path
' M- x/ Y9 x, T* a4 E% o3 |7 @- Shortest distance
- Through air
* b0 m  H1 a6 F# @Decision approved
by the CTL during
, J4 N1 Z3 c* T: ?; ]9 Sits 43rd meeting in
Johannesburg
5 E/ }- i3 B8 t$ M( {' iQuestion: 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
; C8 h- o( z  N3 l6 ]: Inot contain specific information at which angle less than 90 degrees bridging
2 `5 ]: M& G+ T% N* o# Cshall be applied. Some of the above mentioned standards specify that bridging
6 s! A9 |& p! v6 H) eshall be applied for angles less than 80 degrees.
" W! m: t. ^8 L- c7 vCan this 80 degree rule be applied in general for all standards?
6 N4 R; Q% U+ b/ I0 w+ [' lDecision: Yes. The 80 degree rule shall be applied in general for all standards.

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