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 9 y; h1 C% I5 {! e5 J. t

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) $ h' v# Q; N) [+ q+ m

+ I0 m. D. t/ j. Z$ u, O7 u, uStandard: IEC 60664-1/1992
IEC 60335-1/2001
2 n+ V2 D8 D# AIEC 61010-1/2002
6 W$ C# ^$ z9 PIEC 61058-1/2000
IEC 61008-1/2002
IEC 60947-1/2004
" N( z5 a6 a# W: r8 [% fIEC 60598-1/2003
  B% f8 j2 }* q0 y. K! EIEC 60065/2005
IEC 60950-1/2001
* c( k& u) t6 E% J% {! jSub clause:
1 m7 ]! u$ c; M' oSee Table below
4 w/ O+ t+ H: P9 {& H, J) ZDSH N°: 590
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! Z# I' W6 ~& q" p, }" f" S  qSubject: Rule for creepage across
  X- U- }4 ?1 x! J! j4 ^4 w, L$ lgrooves and similar
surface discontinuities
6 a  v# A$ h1 W/ ^Key words:
- Creepage
- Grooves
- Conducting path
- Shortest distance
& @' u4 K/ [2 ~" {$ [- Through air
" z) F1 U: n. w0 ]( r4 m% X5 k* {0 JDecision approved
" R, ^5 {9 f: G9 T9 e5 oby the CTL during
$ ?/ P- g+ J- r9 k: Gits 43rd meeting in
Johannesburg
. Z( B, F/ }4 `+ MQuestion: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners
' z/ a8 l; W4 A4 l, a3 x# iwith angles greater or equal than 90 degrees are not bridged. IEC 60664-1 does
( C, R2 M3 j# n& f/ }! @not contain specific information at which angle less than 90 degrees bridging
, Q2 d/ K2 D  u" k5 V! ^! v/ Fshall be applied. Some of the above mentioned standards specify that bridging
shall be applied for angles less than 80 degrees.
; t! R1 }) \$ P* _$ F  KCan 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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