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 ! [1 `3 V0 O) I" X

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   W' a, v% u2 Z

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)

Standard: IEC 60664-1/1992
% c1 W! q% `% r* F! l& ~9 v! BIEC 60335-1/2001
IEC 61010-1/2002
IEC 61058-1/2000
7 S0 T5 m$ C, l7 D% cIEC 61008-1/2002
3 j. @- c( I  J; Y' H( V  eIEC 60947-1/2004
- t/ P+ ?/ Y3 F, p2 {IEC 60598-1/2003
7 d5 s7 R- c7 a; ^) VIEC 60065/2005
: g3 ^4 d; n) o+ CIEC 60950-1/2001
+ h0 {3 q5 P  d6 uSub clause:
: z6 U- d. J$ r$ U3 H* Q) i. FSee Table below
' f6 Q; ]$ W( P, y1 zDSH N°: 590
Page: 1(1)
* O1 e) v2 ^. k/ z7 ?; [8 T3 dSubject: Rule for creepage across
grooves and similar
surface discontinuities
Key words:
- Creepage
" d7 \  D1 j! y# ?. H! l- Grooves
- Conducting path
- Shortest distance
- Through air
Decision approved
/ r  Y' Z( r4 z8 U3 [  Pby the CTL during
its 43rd meeting in
1 Z7 v, m0 Z4 G! t2 i0 ~- W! I6 {Johannesburg
Question: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
- z) g3 O( p% a5 z3 Iwith 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
' v7 B# A; p3 L: D! t2 Mshall be applied. Some of the above mentioned standards specify that bridging
6 q3 @, r! J6 O) q  lshall be applied for angles less than 80 degrees.
Can this 80 degree rule be applied in general for all standards?
) ]% V, P* x: P: ~! P1 E7 X; N2 v; q8 ZDecision: Yes. The 80 degree rule shall be applied in general for all standards.
6 l9 v# x; Z* j( U) U6 y
  i9 q& Y  {* f2 d& K
# e" U+ g* j# u5 D8 P% e; K