DSH 590 Rule for creepage across grooves and similar surface discontinuities

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DSH 590 / c* J! t8 {+ u5 i" Q/ w

Rule for creepage across grooves and similar surface discontinuities # v# S) K$ ~% I( N  ?7 O' _

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 0 T- \3 z5 c# q' |4 B, y

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) . y4 \' s2 }& \( j- l1 b

Standard: IEC 60664-1/1992
IEC 60335-1/2001
# g: J$ B3 R$ u* DIEC 61010-1/2002
: m/ _$ M9 p1 ]& ~  v$ |6 q& T/ f$ yIEC 61058-1/2000
IEC 61008-1/2002
IEC 60947-1/2004
IEC 60598-1/2003
5 q$ D9 J0 L" I! }  f' MIEC 60065/2005
6 U1 l- |* P% h8 w  z1 i  D$ bIEC 60950-1/2001
Sub clause:
$ I$ u& J. Z& i2 I! I  R' JSee Table below
DSH N°: 590
Page: 1(1)
  ?) C, e$ w- O  N. ESubject: Rule for creepage across
grooves and similar
surface discontinuities
Key words:
/ U+ o. K& M  `6 K1 a- Creepage
3 Y$ b. s0 f- c* _+ V4 O2 Z7 A; R, j- Grooves
- Conducting path
- Shortest distance
- Through air
* Y- x8 X; U# Q" r$ p% u# @Decision approved
& |0 z6 _0 q% {) h7 w. q& {# O" E2 [by the CTL during
its 43rd meeting in
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 C( y$ B% ?9 ]" i3 N' anot contain specific information at which angle less than 90 degrees bridging
  P; |+ U8 Y$ F2 P  s4 B: P) H1 }shall be applied. Some of the above mentioned standards specify that bridging
shall be applied for angles less than 80 degrees.
6 b$ q) e3 B: ~+ P6 Z; ~6 HCan this 80 degree rule be applied in general for all standards?
2 S4 l8 v0 b2 `Decision: Yes. The 80 degree rule shall be applied in general for all standards.