DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590

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 + \1 q2 b% J! |5 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) * m  d6 A" h' A4 |( o+ R9 U

" c. Y3 f1 d* f) ?4 V( qStandard: IEC 60664-1/1992
* U7 T( [& s  X8 k  ]- l# s* h+ gIEC 60335-1/2001
) j" z! O; l% VIEC 61010-1/2002
) x5 t3 v7 ^  v, fIEC 61058-1/2000
: |; T0 L* ^* z; sIEC 61008-1/2002
, O' i8 E0 k: k: kIEC 60947-1/2004
IEC 60598-1/2003
IEC 60065/2005
; w) O/ Z5 a- {& q* `1 M4 H  C  \IEC 60950-1/2001
Sub clause:
! u* m; B8 x' q; r9 A, o: hSee Table below
DSH N°: 590
Page: 1(1)
* ]$ V/ \: G! n- j* NSubject: Rule for creepage across
" X- a' Q) l7 `- ?) _5 ggrooves and similar
4 }" P3 r& t) X* n. g' n$ W; m  usurface discontinuities
Key words:
- Creepage
9 d' X+ `* x, G# k3 }" K/ M- Grooves
- Conducting path
0 w0 k! N: P2 r3 \: m& u) r, l. P- Shortest distance
- Through air
Decision approved
by the CTL during
its 43rd meeting in
Johannesburg
4 \+ g- a* l9 [$ J& uQuestion: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
4 B/ J, [- b5 j: T5 Q+ F6 e& Vwith 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
shall 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.
* k" W  z- _, [! i& B5 p. a

5 m5 {3 ?9 b- `( e7 u0 M) q  q