DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590   Y$ h3 _6 U* E" G" h

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)

4 n* x2 h$ v! q+ m" f: @" x( g3 ^Standard: IEC 60664-1/1992
# s& E+ S* ~3 d- m1 j9 Y1 T# u9 T) C* PIEC 60335-1/2001
IEC 61010-1/2002
2 w& V4 z1 |/ c$ i4 qIEC 61058-1/2000
IEC 61008-1/2002
) S" N, d. N$ P- o% z, fIEC 60947-1/2004
8 |7 Z/ H% R. Z- g8 k: zIEC 60598-1/2003
IEC 60065/2005
IEC 60950-1/2001
! P8 A" B' g, x4 V1 F/ H2 V. Y( X1 PSub clause:
- J0 I0 s) t  t  \6 w. O: ISee Table below
6 q0 N4 T0 I9 d, B1 qDSH N°: 590
Page: 1(1)
Subject: Rule for creepage across
0 R7 _, W( I2 N- Jgrooves and similar
surface discontinuities
+ w, s" G8 D. m& q/ z. x/ jKey words:
- Creepage
/ i! w* _, k! X- Grooves
- Conducting path
- Shortest distance
8 R7 M3 n$ T6 w+ T- Through air
/ g4 q* g8 v' M( u, b3 H/ {Decision approved
by the CTL during
7 A" x! O: v/ {  A1 Sits 43rd meeting in
7 i9 [$ l, V1 P8 |0 cJohannesburg
3 F6 ~7 T0 r) R) S& R9 V1 ~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
! q9 M( G* d# e* p# l, Pnot contain specific information at which angle less than 90 degrees bridging
shall be applied. Some of the above mentioned standards specify that bridging
8 O3 W/ s  i: F& ]$ M) Z! Eshall be applied for angles less than 80 degrees.
Can this 80 degree rule be applied in general for all standards?
5 Z0 p! J& z4 c+ u. JDecision: Yes. The 80 degree rule shall be applied in general for all standards.

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