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

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DSH 717 4 i% Y3 I2 |) }0 x, k( o

Creepage and clearance determination, groove, recess, corner, bridging of distance X . `( |3 S: T% D. Y  O8 ~  K& q

4.2, 6.2 . l4 l! r- X) K0 ^7 j: p' h

60664-1(ed.1.2) & 60065-1(ed.2) & All equipment standards based on these

Standard(s): No. Year
IEC 60664-1/2002 ed1.2
IEC 60664-1/2007 ed2.0
7 k; s  t' G3 P4 n8 z/ \6 B% e: tAll equipment standards
based on these
; D8 D  g1 h7 G/ IDSH
% X+ r% f# k' m3 S) g0717
2008
Categories:
Various, General
Subclause(s):
4.2
6.2
Developed by:
6 W8 f- r! ~- K6 j8 wWG2 - WG4
$ L: C. p$ p8 V' f7 I4 x8 q0 `Subject:
& E6 T, Y, V1 O: [1 O. X! g' O) ACreepage and clearance
9 p; |2 @5 b7 w4 A! Vdetermination, groove,
recess, corner, bridging
of distance X
Key words:
4 j4 I$ {+ S5 a5 }0 b. h, l* ~7 N- Creepage
* U2 J! A  T9 b" g! {- Clearance
- Groove
. H$ I0 g5 ]0 C/ i. ~" \- Recess
& a- t' T* b- X3 W) ?& F0 X- Corner
- Bridging of distance
1 k0 t% u* p# [9 {" BX
% ?3 ]; [& b6 W; @: UDecision approved at the
2009 CTL Plenary
Meeting
2 Q# z& z% h$ k0 N) [1 pQuestions:
1) How shall the examples given in IEC 60664 be interpreted for intermediate situations?
5 q/ ^8 c5 ~' I% _/ X. P2) 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?
2 |5 @; r, T( C2 D# U3 {0,8mm
/ ]+ A5 S1 A/ U8 v, p% f% b0 O0 U2 mm
PCB
PCB-Track (ending on the
edge of the cut-out
# U7 A8 F" n6 d& _6 J+ L7 |' |) K8 n3) When shall the sentence:
“If the associated clearance is less than 3 mm, the minimum dimension X may be reduced to
one third of this clearance.” be applied?
$ T4 D3 T2 P/ a: jDoes this sentence refer to the actual clearance measured or to the minimum clearance
: j4 B5 k- Y) _9 l8 U( [. B: hrequired?
Decisions:
0 \* J7 ^2 a; w3 V- s/ P2 UAd 1)
An 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
: c5 ~, ~9 I$ W: k/ k5 Y2 yof the methodology is given in the Explanatory Notes to Question 2."
" G" J1 U9 v0 e- Z* _9 L* r3 ^7 FAd 2)
$ c* _5 G  _- L9 T  s8 j$ w" @1 o. iThe example shall be judged without any bridging of the corner in the cut-out
: d$ j7 t& E/ o8 U/ r/ j
creepage = 2,8 mm, no shortcut applicable.
Ad 3)
The sentence shall always be applied whenever the required clearance is less than
3 mm and the allowed reduction of the minimum dimension X shall be referred to 1/3 of the
required minimum clearance.