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

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) & ?3 J  Q" u, S9 h; t

4 n3 [3 O  {) X5 nStandard: IEC 60664-1/1992
IEC 60335-1/2001
3 w5 v1 k- A3 R3 `1 [4 h  YIEC 61010-1/2002
. }+ c- w+ k, v  p" R' u% UIEC 61058-1/2000
( ]& ~8 w  j) E/ P* O! n. jIEC 61008-1/2002
IEC 60947-1/2004
( Q  Q9 ]: j0 D: W% xIEC 60598-1/2003
# z8 q- s$ \) I1 \( Y7 p7 fIEC 60065/2005
2 L" o$ |* }7 W3 H: M" Y/ xIEC 60950-1/2001
1 V+ T! Y- @7 YSub clause:
See Table below
: Q$ j$ }, X- C1 aDSH N°: 590
Page: 1(1)
" G) S" a" ]' d5 f' {Subject: Rule for creepage across
grooves and similar
surface discontinuities
9 }+ [. t( }  {2 ^( rKey words:
9 f6 E* t! A' E- Creepage
- Grooves
- Conducting path
$ H% n2 k3 U: _0 `- Shortest distance
- Through air
Decision approved
by the CTL during
its 43rd meeting in
+ t# c# M: k6 x" q7 GJohannesburg
. ^0 O) f3 [- F$ Q* u( f+ ~Question: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
( j0 G' |3 D2 b7 ~$ z2 q/ E. B1 ?2 q8 jwith 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
3 t# W$ b, ^( r0 |3 l7 qshall be applied for angles less than 80 degrees.
Can this 80 degree rule be applied in general for all standards?
, P! q" Y& s% X! Q: L) f1 J# b! R( fDecision: Yes. The 80 degree rule shall be applied in general for all standards.
+ \7 ~6 }  S" v$ i) a) O% f/ `

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