DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 0 N% G+ L% e; ?3 V( h9 l. m3 v

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 3 b  ^0 u( b+ v, A1 _6 V; m

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)

5 N0 J( X% [. t$ vStandard: IEC 60664-1/1992
IEC 60335-1/2001
IEC 61010-1/2002
5 L6 E6 `' k5 V) _IEC 61058-1/2000
* f1 x: x% ?+ [. ?, W) AIEC 61008-1/2002
IEC 60947-1/2004
: ^# c8 |6 l0 u1 U8 X# S) F' d" aIEC 60598-1/2003
& _7 {. f# h/ `! v+ I- JIEC 60065/2005
IEC 60950-1/2001
# d$ F2 p! k+ B# P" rSub clause:
+ Z! e) U: D6 fSee Table below
+ Z7 }8 b. F3 d" e$ P2 T, VDSH N°: 590
Page: 1(1)
" l) s; o( I! I) }Subject: Rule for creepage across
6 v+ S2 x6 @2 Q: Cgrooves and similar
% Z, E. R4 p1 k7 jsurface discontinuities
Key words:
7 c, b% F# P! `& Y# S5 W- Creepage
( n3 w2 c3 D0 D- Grooves
- Conducting path
0 j! E0 q- K6 e. s# p# T- Shortest distance
- Through air
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
0 M% g/ i( r5 M0 B3 c# H  H# a  Swith 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
  i: Y$ h$ n) {( Tshall be applied. Some of the above mentioned standards specify that bridging
5 K. B  u/ n) x% r) M3 @! \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.


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