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标题: DSH 590 Rule for creepage across grooves and similar surface discontinuities [打印本页]
作者: 小米    时间: 2012-9-18 11:40
标题: DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590
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Rule for creepage across grooves and similar surface discontinuities) u9 [1 e% z& l& d" f8 Q0 J
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% ?+ e9 a4 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)
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& B, s1 r3 I; M  }7 h2 CStandard: IEC 60664-1/1992& V* Q! }% k1 T5 u. ^/ e
IEC 60335-1/2001
5 a9 z: i* V/ y! @IEC 61010-1/20024 l' N& d. n% _. `. O/ Y$ j
IEC 61058-1/2000- l0 ?7 G, {( V
IEC 61008-1/2002
* V  m0 `7 J: N! N4 C$ b* z! vIEC 60947-1/2004
9 v6 o; ]7 {3 Y5 b1 n- ?IEC 60598-1/20035 c* a' Z. t6 t0 L9 A- p+ U
IEC 60065/2005; v0 j" P- T, G# ~
IEC 60950-1/2001
& c1 t- l2 B% I% LSub clause:/ w. x5 i& ?% ~* [( s, M7 E
See Table below* @; s8 T6 {" ], c: j3 o
DSH N°: 590' o: z( `" d5 B+ r' H
Page: 1(1)' w/ E3 o, X. K
Subject: Rule for creepage across
7 ?2 x* V# y$ x! x7 |+ egrooves and similar
# D; V6 V2 n; m, c% Y$ Nsurface discontinuities  _& D9 y+ H! R( D9 B$ Q
Key words:& o  q5 o+ K1 c8 v
- Creepage
, X7 N2 a% w/ V6 W9 ]% J- Grooves
# p0 j6 G9 U  J' ]- Conducting path
; j, E% r& b1 H5 j& _- i- Shortest distance
! a; J5 {! |7 C- Through air
" M7 Y1 b2 x/ `9 ~: `! iDecision approved& q; Z9 y+ B9 X' q$ }
by the CTL during  a& W2 R+ F2 }1 C. j
its 43rd meeting in
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Question: As can be seen from examples 2 and 6 of IEC 60664-1 sub clause 4.2 corners! t9 b/ V# }1 K" O
with angles greater or equal than 90 degrees are not bridged. IEC 60664-1 does# U# `, K; K8 \& F) Z" O
not contain specific information at which angle less than 90 degrees bridging# D( g6 c5 a- b* a& Q! M
shall be applied. Some of the above mentioned standards specify that bridging
/ k  e0 B, `7 A& T/ K1 Pshall be applied for angles less than 80 degrees./ a  r9 m! Z1 R( |( e; S
Can this 80 degree rule be applied in general for all standards?
9 u) b* s) G' m, n- @) G& XDecision: Yes. The 80 degree rule shall be applied in general for all standards.
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