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

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)

! A% @1 \4 ^$ [Standard: IEC 60664-1/1992
IEC 60335-1/2001
IEC 61010-1/2002
, m+ c/ o' e/ C7 RIEC 61058-1/2000
/ D( A% V0 h* Q) W3 U9 }' f( w, `IEC 61008-1/2002
5 F( s  b/ `! h& T) ^. E8 aIEC 60947-1/2004
# D8 U& M  F' y7 ^# @& |8 V0 L) vIEC 60598-1/2003
IEC 60065/2005
IEC 60950-1/2001
8 M1 T7 ^% r7 D' E  G/ @3 T1 r4 ?Sub clause:
See Table below
0 ~7 U. a. t! P9 Z* CDSH N°: 590
Page: 1(1)
- r% _4 ^2 A7 O" C# j( C5 ZSubject: Rule for creepage across
grooves and similar
surface discontinuities
Key words:
$ [" A  ~- R( G% i& v$ u2 i2 v- Creepage
- Grooves
- Conducting path
- Shortest distance
. X. V. p! ]) E7 A- Through air
2 t0 o' R6 r. _; m. \5 A/ C* z& G# ^Decision approved
8 i% Q2 O( d9 L6 n" ^+ B$ w+ jby the CTL during
, {7 _! \6 W$ M1 Sits 43rd meeting in
Johannesburg
. q1 |4 O& S5 w/ r- R. e1 d+ n5 uQuestion: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
5 B: ~, I" T- E! ?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
) K3 I5 B8 k: l" |2 Rshall be applied for angles less than 80 degrees.
( f- ?3 b1 {. K& r! sCan 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.


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