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 ! _% N3 U- ]7 |# V1 w) l! O

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 : j& i+ [: [4 G9 r: |

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
! o4 G9 M5 x1 n  a% ]6 _3 ~& ~IEC 61010-1/2002
IEC 61058-1/2000
IEC 61008-1/2002
IEC 60947-1/2004
: ?* f( v, x5 q& l8 O9 G+ o) JIEC 60598-1/2003
; \# K! Q# L7 s1 e$ j1 XIEC 60065/2005
IEC 60950-1/2001
6 h& }9 N( r/ G0 j3 ZSub clause:
See Table below
+ B' v$ c7 p& B6 l1 [' H6 ~6 xDSH N°: 590
- Z$ j' t$ T( sPage: 1(1)
/ F. m1 I; z9 l; J1 x) ySubject: Rule for creepage across
grooves and similar
: i' L' d$ k' R3 `. I/ _3 ksurface discontinuities
Key words:
: }4 P5 l0 n. T4 _  k- Creepage
- Grooves
- Conducting path
) B: N2 A9 w, ~- Shortest distance
: g, w: ]# G; V+ F) m3 j. }) a- Through air
Decision approved
by the CTL during
% ?& _* E0 O  k6 D; b0 v4 E- bits 43rd meeting in
  N4 P. N  b  F9 hJohannesburg
$ G4 p2 R5 }' y, B9 H9 G% bQuestion: 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
' N. O. ^; l7 K! w. f/ J0 k3 Y4 L: u0 ^not contain specific information at which angle less than 90 degrees bridging
shall be applied. Some of the above mentioned standards specify that bridging
0 T, g, O( {5 r5 vshall be applied for angles less than 80 degrees.
& O: d7 X6 d+ VCan this 80 degree rule be applied in general for all standards?
3 C9 L# F0 W6 S# M* \Decision: Yes. The 80 degree rule shall be applied in general for all standards.

% t/ }, k/ y# A( g1 x