DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 : y; D; X& [% k2 g9 s. m" a. y( k

Rule for creepage across grooves and similar surface discontinuities ( X( |/ |9 b3 F! a1 t) |

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 ( B0 V( Y, I% [2 [2 o) V; 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
IEC 60335-1/2001
0 M) V/ q, E2 p- Z; ?IEC 61010-1/2002
$ Z0 n: m/ E- E9 R( `IEC 61058-1/2000
9 O9 e; e  e  ?/ V( O/ S, F; iIEC 61008-1/2002
7 @/ |7 j+ P. ?5 e8 C. \, L2 v& sIEC 60947-1/2004
4 G# _  e* p1 ^$ F7 G3 ~- eIEC 60598-1/2003
$ q1 \0 D# k5 D: w3 k: r+ j4 bIEC 60065/2005
IEC 60950-1/2001
Sub clause:
$ I2 O& r1 o" }0 jSee Table below
3 ~8 _4 D' d  O! |. A7 GDSH N°: 590
Page: 1(1)
* h, M) w2 s" v& |( o) @Subject: Rule for creepage across
grooves and similar
8 y3 R" D8 f7 ^8 Qsurface discontinuities
0 y, B8 U1 U& U, q% aKey words:
- Creepage
- Grooves
- Conducting path
2 P3 U2 O) n. R: o  s9 U# Y- Shortest distance
- Through air
  k0 q+ _3 }9 D0 @- C8 w* _Decision approved
by the CTL during
its 43rd meeting in
Johannesburg
Question: 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
! V4 @, a) Z  P6 ?3 V0 anot contain specific information at which angle less than 90 degrees bridging
' ^- z! \7 `& D7 Jshall be applied. Some of the above mentioned standards specify that bridging
2 c5 C/ u% B, f% N1 X4 B: U/ ushall 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.
# i; S) l$ \5 q# _, I* o0 M: g
8 G0 b8 s, e. [: M9 }/ S" G