DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 $ Q9 l, Q2 C8 ^, @. O : c& U9 ^2 _9 x! ~4 N4 ?* t

Rule for creepage across grooves and similar surface discontinuities ' Z: i2 S4 c1 k. e0 C7 {2 m

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 ! s# B5 N2 o2 C% H( Y

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) % A6 ~; \. G  ]/ C

Standard: IEC 60664-1/1992
IEC 60335-1/2001
IEC 61010-1/2002
IEC 61058-1/2000
% C" T8 ^. c* P9 BIEC 61008-1/2002
; m! `9 @& q, M& [) @IEC 60947-1/2004
  k* [; E. z4 s8 F4 I3 E3 u7 b2 fIEC 60598-1/2003
IEC 60065/2005
IEC 60950-1/2001
Sub clause:
See Table below
: |# b6 |7 z& P0 ?! q7 |! ^DSH N°: 590
1 R+ E  o$ T9 f: Y. S4 ZPage: 1(1)
Subject: Rule for creepage across
) V% _2 O0 A) x! |! Ngrooves and similar
surface discontinuities
Key words:
- Creepage
. n" K- v+ |! u$ d  n- Grooves
- Conducting path
- Shortest distance
- Through air
Decision approved
by the CTL during
its 43rd meeting in
4 d$ V+ ^% W+ u2 K) eJohannesburg
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
not contain specific information at which angle less than 90 degrees bridging
0 ?5 x- G& D1 }' M' ]shall be applied. Some of the above mentioned standards specify that bridging
shall be applied for angles less than 80 degrees.
; t' H  J8 a2 V8 @2 D+ R6 d1 c6 HCan this 80 degree rule be applied in general for all standards?
, ~* c9 V+ H) HDecision: Yes. The 80 degree rule shall be applied in general for all standards.


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