DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 $ o1 P7 Z" w8 p . j$ b. n5 }8 e$ V# j

Rule for creepage across grooves and similar surface discontinuities : S* o! m0 `' K7 _3 l6 W( A9 p

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 / B  K) ~' a- h0 }8 ]3 J3 j! 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)   ?3 P9 E8 Z. l6 I

3 y9 c( R' ?. A# e- W: MStandard: IEC 60664-1/1992
) Y8 }9 ^7 k1 h% w- H: [IEC 60335-1/2001
IEC 61010-1/2002
9 ?% y- T- b7 s; [( IIEC 61058-1/2000
IEC 61008-1/2002
: J0 ]" m( ]% b9 S# `, {IEC 60947-1/2004
IEC 60598-1/2003
IEC 60065/2005
" \9 n. ^! u8 R- C5 h: d3 _IEC 60950-1/2001
' g4 g# n/ Z, dSub clause:
See Table below
DSH N°: 590
" H( C+ \1 H* \0 H  u1 XPage: 1(1)
) p3 X' C) b$ sSubject: Rule for creepage across
0 H, c+ k! ]1 P, i8 Pgrooves and similar
surface discontinuities
Key words:
- Creepage
6 ]$ \( x6 z1 I! g. ?' q2 z* h- Grooves
8 e/ Y5 |7 j/ ^- Conducting path
" }- n1 X; k3 ]* Q0 f- Shortest distance
7 y$ _/ `; L* Q" x+ Z; M9 u8 F0 q- Through air
+ Z( b' W  K/ p1 f4 Z3 n  UDecision approved
by the CTL during
( `; T  G/ U* lits 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
7 Y) s5 e% s: h, ]) {! ]not contain specific information at which angle less than 90 degrees bridging
) l+ c( _7 F4 zshall be applied. Some of the above mentioned standards specify that bridging
shall be applied for angles less than 80 degrees.
1 F8 b; j. `; xCan this 80 degree rule be applied in general for all standards?
: [' E8 a) ]4 P& zDecision: Yes. The 80 degree rule shall be applied in general for all standards.
0 y5 y* d: P9 Y. p7 m! n
, C$ }; _- Z1 x