DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 3 ?: `( G4 P1 Q8 L

Rule for creepage across grooves and similar surface discontinuities 2 p( ~( m  _; ]7 d* C* R3 O4 Y

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 ( Z  {8 A. `2 z7 D

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) ( l5 r: \: C5 u! ^

' O% o# ]3 c+ Q* ^Standard: IEC 60664-1/1992
IEC 60335-1/2001
' g& b) ~- Q5 Q! D; t+ ]IEC 61010-1/2002
4 v& r5 H( B( u7 D7 @IEC 61058-1/2000
IEC 61008-1/2002
1 _; T7 P: ~( |5 c: W3 JIEC 60947-1/2004
8 e7 \. ~( ^2 E! `; b7 |IEC 60598-1/2003
IEC 60065/2005
IEC 60950-1/2001
$ ~* B. i7 M. o# C( PSub clause:
, r8 D6 Z0 d1 V+ p) g- gSee Table below
DSH N°: 590
/ d$ Y4 O! J( u1 J- H3 y) bPage: 1(1)
Subject: Rule for creepage across
grooves and similar
- J# e3 B: P+ qsurface discontinuities
5 B1 j' w& K' N5 i$ V% R! n- [4 EKey words:
- Creepage
- Grooves
- Conducting path
- Shortest distance
- Through air
Decision approved
8 Q) C/ U  `" \- _: Iby the CTL during
! h6 F  K# Z: bits 43rd meeting in
" r' |6 Y; G: _, S* ~Johannesburg
8 z& A3 O( S0 f* LQuestion: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
. q, H% O( H/ h/ ~with angles greater or equal than 90 degrees are not bridged. IEC 60664-1 does
/ f5 H1 h' v- w/ H; bnot contain specific information at which angle less than 90 degrees bridging
3 j( `3 a6 @7 j9 Dshall be applied. Some of the above mentioned standards specify that bridging
shall be applied for angles less than 80 degrees.
6 [( R6 y. V, z* eCan 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.
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