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

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DSH 717 ! [! n1 J7 m, v+ `5 t

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

4.2, 6.2

60664-1(ed.1.2) & 60065-1(ed.2) & All equipment standards based on these , H* @8 ]) M6 a4 Q/ b/ r

Standard(s): No. Year
4 R6 u1 L8 e! @7 bIEC 60664-1/2002 ed1.2
IEC 60664-1/2007 ed2.0
$ G, [' e' ]% y# v6 k" x+ TAll equipment standards
based on these
4 k( _9 q2 o4 T; F  NDSH
( A% J7 Y5 M% T' B) ?, x/ B0717
$ R7 p- Q) f. F0 ?, ]2008
7 m! w+ m4 {7 ^Categories:
& h' ?; p4 a+ vVarious, General
Subclause(s):
+ T" U! O" [, P: ?- ^8 B3 c, x; c4.2
6.2
* q* i( |  p; s+ B: y! j' G( {Developed by:
WG2 - WG4
: M! o' U4 ^0 Z+ u  p7 `) iSubject:
+ Q5 H- e" N) S9 O% X: UCreepage and clearance
1 G/ O' }2 p4 H* A9 j" v0 Ddetermination, groove,
recess, corner, bridging
' ^4 k0 a) y6 E" d/ D8 z$ [of distance X
Key words:
- Creepage
- Clearance
- Groove
- Recess
- Corner
- Bridging of distance
X
' \* G  ^) W! y/ L2 ?* zDecision approved at the
: j2 ]. c6 f( w% g2009 CTL Plenary
5 c, V0 _: T/ Q$ m, Q( u" bMeeting
0 n5 Y$ Z) @2 ~4 m& YQuestions:
1) 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?
0,8mm
$ T9 Y7 y, w& U) f' X- M1 z2 L2 mm
PCB
) s* b" B# I! N6 J  z' G; CPCB-Track (ending on the
edge of the cut-out
3) When shall the sentence:
- R( _2 R) B! {  h. P& O% n0 W“If the associated clearance is less than 3 mm, the minimum dimension X may be reduced to
one third of this clearance.” be applied?
Does this sentence refer to the actual clearance measured or to the minimum clearance
$ T& E' e5 e# xrequired?
Decisions:
Ad 1)
& j% @% y6 l7 t- H6 J. `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
of the methodology is given in the Explanatory Notes to Question 2."
/ K4 x- u) N# S1 oAd 2)
8 k0 F6 O% g( N7 WThe 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.
Ad 3)
+ l- v6 ^# I7 P& X" L% q$ RThe sentence shall always be applied whenever the required clearance is less than
8 g2 A6 A& H3 g+ f6 k3 mm and the allowed reduction of the minimum dimension X shall be referred to 1/3 of the
. c! Y; W0 ]+ `$ Jrequired minimum clearance.