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 & ]0 W# O9 C1 T

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 . E0 t" u0 }8 `+ S$ ~; x5 |! r6 ]; i

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
( O$ n1 t3 U, a4 dIEC 60335-1/2001
IEC 61010-1/2002
8 k$ T! M' Y6 u  k! V6 @IEC 61058-1/2000
IEC 61008-1/2002
IEC 60947-1/2004
- _1 D+ |$ G. l. j2 gIEC 60598-1/2003
. C# b( b  I. @8 V& m% dIEC 60065/2005
IEC 60950-1/2001
# U' H9 y6 y9 b$ t" p2 [Sub clause:
' K* C5 k+ x* V$ i, V8 f" S. CSee Table below
6 n, ~6 F1 Z. {/ m8 bDSH N°: 590
1 M- u: l8 l# M( w" A, CPage: 1(1)
Subject: Rule for creepage across
grooves and similar
surface discontinuities
Key words:
1 I# }3 h+ T9 f/ T4 m3 T- Creepage
- Grooves
+ W0 g- g& U2 W2 `" Q- Conducting path
- Shortest distance
8 M8 T) G! }% d& {- Through air
Decision approved
8 @5 _" m9 U, y$ q. rby the CTL during
its 43rd meeting in
4 f+ ~! {5 I- y) O3 N  }9 g4 \- HJohannesburg
4 @+ u6 Y" u* ^& lQuestion: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
( o' H! q' J9 G% B4 d% }" d) Nwith angles greater or equal than 90 degrees are not bridged. IEC 60664-1 does
( `  k' D! @' W6 g) Qnot contain specific information at which angle less than 90 degrees bridging
: b: L# E! {: M! i; [shall be applied. Some of the above mentioned standards specify that bridging
shall be applied for angles less than 80 degrees.
& F& z) B6 N/ V3 ^  Z8 [1 i7 D. ]Can this 80 degree rule be applied in general for all standards?
3 s, W! d+ y! a1 t& G/ i6 W4 ^3 eDecision: Yes. The 80 degree rule shall be applied in general for all standards.
* s8 C* @/ n: l5 o) I
- P; [% V. N$ |; ~/ U$ I3 u
# T3 y. W+ n3 ^  o. a; K