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 A. w8 d) J: L. Q

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
& P3 c: d4 ?0 Y! X: dIEC 61010-1/2002
# {6 t* a% ^' e# b  iIEC 61058-1/2000
IEC 61008-1/2002
8 G3 b% I( V) [5 a$ W, r1 aIEC 60947-1/2004
IEC 60598-1/2003
$ @, u0 a7 \* o; p1 F5 LIEC 60065/2005
0 U2 n0 X- p% u' f' j6 YIEC 60950-1/2001
Sub clause:
7 c" l, U, r6 h* Z' v4 gSee Table below
+ y+ C+ j6 J1 [- KDSH N°: 590
Page: 1(1)
Subject: Rule for creepage across
grooves and similar
surface discontinuities
Key words:
  n0 ?- R$ i7 s5 v5 u( t( i# W- Creepage
- Grooves
- Conducting path
. J# i, m1 U/ c- Shortest distance
- Through air
% ]! f0 {) ~7 pDecision approved
by the CTL during
0 t) H. e$ }0 r/ y6 i) Q  s% X9 Nits 43rd meeting in
Johannesburg
0 ?! ^8 {5 C) g, _Question: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
* a+ |) {1 {  ^+ ]with angles greater or equal than 90 degrees are not bridged. IEC 60664-1 does
3 l, r9 G, C1 S7 wnot contain specific information at which angle less than 90 degrees bridging
: B8 j& d& J$ b9 T% dshall be applied. Some of the above mentioned standards specify that bridging
9 A: ^1 H" v8 f, @0 a8 jshall be applied for angles less than 80 degrees.
& S0 S+ i" e8 y" Y6 XCan 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.
! A% c9 i# q. B$ U