DSH 717 Creepage and clearance determination, groove, recess, corner, bridging o

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DSH 717 * ]  p6 P! m5 }

Creepage and clearance determination, groove, recess, corner, bridging of distance X

4.2, 6.2 . Q0 ]: w( C" W8 W

60664-1(ed.1.2) & 60065-1(ed.2) & All equipment standards based on these 7 H* {# W" L2 c+ ~" Y

6 P, o4 Z: A( }Standard(s): No. Year
IEC 60664-1/2002 ed1.2
2 i$ E( W7 a1 e: d1 e3 O- n0 j6 r6 V- lIEC 60664-1/2007 ed2.0
All equipment standards
based on these
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, q( G  c! s) @$ O5 f2 }0717
2008
Categories:
# H3 ^5 g/ c# S2 w  y8 w* OVarious, General
, }3 @$ W6 |% `% s+ DSubclause(s):
4.2
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Developed by:
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Subject:
Creepage and clearance
determination, groove,
recess, corner, bridging
of distance X
Key words:
0 ?8 O) \2 [" |' X- Creepage
- Clearance
& p! O# A; j) }- `* L- M- Groove
# L) [! H4 x7 U! w0 u. P2 O- Recess
- Corner
- Bridging of distance
+ `8 e2 ]0 L7 s: yX
' [) n  C# U! ^6 ]2 V/ U* T. |Decision approved at the
' A( x. I* h3 R  n2009 CTL Plenary
, r$ G6 `# p, I- ]0 wMeeting
Questions:
0 w9 j6 B3 Q  b3 _8 S1) How shall the examples given in IEC 60664 be interpreted for intermediate situations?
2) How shall the example given below be judged correctly, based on the examples given in
IEC 60664-1 and based on the assumption that X = 1 mm?
8 n8 L" y) y; q# ]0,8mm
. j! e1 {/ J* C& N! ^2 mm
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PCB-Track (ending on the
* f' @3 F2 F, J3 Sedge of the cut-out
% V" _6 M" Z- j/ M) X# q# q3) When shall the sentence:
4 {1 O0 K  H5 s( S; F“If the associated clearance is less than 3 mm, the minimum dimension X may be reduced to
9 \0 x; O) Y) U; [one third of this clearance.” be applied?
  C' \# o: @# SDoes this sentence refer to the actual clearance measured or to the minimum clearance
required?
Decisions:
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* H& |. y3 R. L7 d: ~" WAn intermediate situation not covered directly by the Standard shall be determined by
considering it as an extension of the most appropriate example from the Standard. An example
of the methodology is given in the Explanatory Notes to Question 2."
Ad 2)
1 b! U5 B& y( F, b8 |" t/ nThe example shall be judged without any bridging of the corner in the cut-out
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creepage = 2,8 mm, no shortcut applicable.
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The sentence shall always be applied whenever the required clearance is less than
* r% y; x' q% f& F5 a$ Z1 a* `3 mm and the allowed reduction of the minimum dimension X shall be referred to 1/3 of the
/ [! ^9 `1 C3 {# g6 G6 k0 rrequired minimum clearance.
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