DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 & `5 q+ r0 i; S( g; J ! C( @+ W% G& J; Y8 a/ f5 N

Rule for creepage across grooves and similar surface discontinuities & G; {4 |: s# C. O; 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) # N! X  [: F% a, U1 g

Standard: IEC 60664-1/1992
& I: b1 d% @) h% Y3 F9 FIEC 60335-1/2001
IEC 61010-1/2002
IEC 61058-1/2000
3 n8 Y4 M: v: |- C1 @  h  G9 c! CIEC 61008-1/2002
IEC 60947-1/2004
IEC 60598-1/2003
IEC 60065/2005
  E! Z7 K1 I5 i6 f% zIEC 60950-1/2001
0 W2 B1 a8 j4 x" R$ vSub clause:
' k: N* c' A4 z- B( W( u+ E$ u2 D. ~See Table below
% S# ~2 W! y, m  c' i6 x! NDSH N°: 590
Page: 1(1)
Subject: Rule for creepage across
* r# o& o' X; `- x4 X6 r& G7 Lgrooves and similar
8 E+ W$ |1 O6 a( `2 d  ~. jsurface discontinuities
Key words:
- Creepage
+ _% ~! w0 f$ X- Grooves
9 e' p9 w  y4 K- Conducting path
- Shortest distance
) p, r4 ]+ f* @; r8 w! i6 [- Through air
7 a+ S6 P5 n" l( YDecision approved
by the CTL during
7 @7 v% z; U: u5 T/ X" P( |its 43rd meeting in
Johannesburg
2 p, }- H# Y4 jQuestion: 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 w: W3 {/ E0 ?3 l3 n, fshall 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?
Decision: Yes. The 80 degree rule shall be applied in general for all standards.