DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 3 N6 `7 [8 V1 q# U5 ^5 h

Rule for creepage across grooves and similar surface discontinuities / {" y- }/ _2 b% I( `: v

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) 1 o9 S; B  T- m

Standard: IEC 60664-1/1992
  ]( s" Z* K1 J3 O9 eIEC 60335-1/2001
IEC 61010-1/2002
IEC 61058-1/2000
/ L8 z& c2 P8 d) DIEC 61008-1/2002
3 I4 `, r" H, z+ N4 bIEC 60947-1/2004
IEC 60598-1/2003
IEC 60065/2005
6 J/ F$ h* \- h, J8 ~6 ?IEC 60950-1/2001
1 I. X- U' V5 E( o/ MSub clause:
# h; }7 m7 T# ^# }4 s* bSee Table below
# X5 T, o( }5 K- G  D. k6 oDSH N°: 590
Page: 1(1)
Subject: Rule for creepage across
grooves and similar
surface discontinuities
Key words:
6 O5 c: h7 v3 k9 X' z7 p- Creepage
3 j6 l+ m5 p3 E7 a) l4 Z6 b- Grooves
4 l& N$ p0 x1 c. {4 m- Conducting path
: }( c/ |1 l% r& g9 x9 z( B- Shortest distance
; W' N4 v; F+ ], G, K. ~- Through air
Decision approved
- R5 r/ }. s; T6 t  Z% cby the CTL during
' u+ `4 |. D" j; e5 }, p6 Hits 43rd meeting in
& i! r! k- Z+ ^9 K% V* \Johannesburg
Question: 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
9 \$ F" W+ n) M" a6 R% e7 ynot contain specific information at which angle less than 90 degrees bridging
. [8 p! k4 l$ W* d6 b- j* Gshall be applied. Some of the above mentioned standards specify that bridging
0 D7 {* [' P+ [# B( ashall be applied for angles less than 80 degrees.
Can this 80 degree rule be applied in general for all standards?
7 P2 i. {2 y  E- i. X, B/ G( c* eDecision: Yes. The 80 degree rule shall be applied in general for all standards.

9 h8 N+ @( d# v! b7 H& b
( C4 |" p5 t+ i1 I0 j  s