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 & G# ]+ l+ j3 U6 N) h' w( e

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) ' B8 j$ b  B# n; E

Standard: IEC 60664-1/1992
IEC 60335-1/2001
IEC 61010-1/2002
( J8 D) a4 |- ~0 x" `4 `. rIEC 61058-1/2000
/ [. |: v) f+ Z7 Q# c+ u* p2 B3 |IEC 61008-1/2002
IEC 60947-1/2004
IEC 60598-1/2003
IEC 60065/2005
IEC 60950-1/2001
/ J2 j0 V7 B( G  H; I6 G' B) r! fSub clause:
0 @5 o( k( a5 ~7 ]See Table below
6 q$ R3 U# e# v  pDSH N°: 590
7 p9 r1 T7 j* N  f! D2 J7 A9 UPage: 1(1)
% B. r5 Q4 k/ ]9 V' {  T- s1 H8 aSubject: Rule for creepage across
grooves and similar
$ o% O; s0 S7 b( u4 usurface discontinuities
Key words:
- Creepage
- Grooves
- Conducting path
- w3 ~4 h4 }& M- Shortest distance
- Through air
Decision approved
+ {3 S! N9 n+ k( R" g# E% Fby the CTL during
9 U' Q) {6 O7 m0 G  \its 43rd meeting in
* n0 q" Q/ k- yJohannesburg
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
not contain specific information at which angle less than 90 degrees bridging
shall be applied. Some of the above mentioned standards specify that bridging
; T+ y" C+ s+ e- I8 o/ n- X5 Z/ rshall be applied for angles less than 80 degrees.
9 G: i  k1 Q' _8 R( e3 h$ f6 u' t6 j8 sCan this 80 degree rule be applied in general for all standards?
8 P$ ^% d4 `% _- d0 ]( W4 ADecision: Yes. The 80 degree rule shall be applied in general for all standards.