DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 8 z6 Y' E- h$ r* w

Rule for creepage across grooves and similar surface discontinuities 3 \* t: O( G4 s+ e7 C- w

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) ! P) a1 P0 {* c6 h0 N* v

& S4 W4 ]* I) }2 y; s: m! FStandard: IEC 60664-1/1992
IEC 60335-1/2001
IEC 61010-1/2002
7 }& v/ m" A7 W- BIEC 61058-1/2000
  P: h# ^1 a; L/ _IEC 61008-1/2002
6 D3 c9 V6 v5 Y8 T9 F' s. tIEC 60947-1/2004
0 _, q+ `7 K. ^" I  dIEC 60598-1/2003
  L( b2 t. h; S. c6 A# iIEC 60065/2005
IEC 60950-1/2001
. a- O# G- f# X' d5 \Sub clause:
, |) n) q$ ~  ?' G+ q/ J6 MSee Table below
9 u) R2 O, `/ Z6 \" q& ?DSH N°: 590
" L6 W9 I3 a0 c7 J/ F5 a" ~Page: 1(1)
6 }& V5 I% N- y2 N! s* u4 M# lSubject: Rule for creepage across
grooves and similar
) z, i+ P# C9 I1 I- {# S% v# esurface discontinuities
# n" O$ j% w/ T+ r% uKey words:
. z. r( R0 o0 v5 J8 u- Creepage
0 A6 |9 D9 o2 z/ r) ?$ s1 H- Grooves
) J$ @2 ]& c# a+ c- Conducting path
1 a( c4 R: e" o- Shortest distance
- Through air
Decision approved
by the CTL during
its 43rd meeting in
Johannesburg
8 N' C& f+ o) s0 ]$ PQuestion: 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
6 H9 v% P$ k5 n( w) f( S6 N0 E# g$ Dnot contain specific information at which angle less than 90 degrees bridging
, N3 K3 W; n, a' a9 ]" _0 ushall be applied. Some of the above mentioned standards specify that bridging
" c. a! K! m/ }/ u, Bshall be applied for angles less than 80 degrees.
Can 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.