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

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DSH 717

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 1 G. L- k0 e) {; G6 `

Standard(s): No. Year
IEC 60664-1/2002 ed1.2
. ]. [' ^* |2 q/ FIEC 60664-1/2007 ed2.0
& ?9 z7 V7 Y! a5 a" i* rAll equipment standards
based on these
DSH
) z' ?  ]( n0 \, G- L4 s$ B0717
2008
Categories:
" `1 S; b. b6 _Various, General
Subclause(s):
4.2
4 i$ P+ H. L0 i6.2
Developed by:
# i' |+ Z6 ?8 U5 m' ?WG2 - WG4
/ s" U0 g" e5 wSubject:
0 R. i* R# v: v6 G" Y/ G2 bCreepage and clearance
) ]3 k3 v. S2 M6 |0 Cdetermination, groove,
+ q( e% O) E% ?8 ~( D0 f; w# Nrecess, corner, bridging
of distance X
Key words:
+ C8 o) e6 _9 T$ Z8 G: T- Creepage
' ]0 m+ b$ r3 P7 E5 ~* W; e- Clearance
2 |% \6 n, l% A1 H2 T* S" b- Groove
  z% j, [" Q& C. w; w; ~2 k! |- Recess
* Y0 Q5 l1 P- h0 A8 l8 Z- Corner
6 [& d, x; K- H' |5 a/ G7 T- Bridging of distance
X
Decision approved at the
2009 CTL Plenary
Meeting
( f8 n# G, h7 U/ T" yQuestions:
; f! s3 J) }/ a1) How shall the examples given in IEC 60664 be interpreted for intermediate situations?
9 x0 D. M9 j6 M2) How shall the example given below be judged correctly, based on the examples given in
  s* Y2 c* ?3 o- v7 l, e1 ZIEC 60664-1 and based on the assumption that X = 1 mm?
0,8mm
2 mm
PCB
PCB-Track (ending on the
edge of the cut-out
3) When shall the sentence:
“If the associated clearance is less than 3 mm, the minimum dimension X may be reduced to
2 `( l& A/ S6 A& S" u+ X: Yone third of this clearance.” be applied?
Does this sentence refer to the actual clearance measured or to the minimum clearance
, d1 Y' `. }  I# H' E4 p% urequired?
: ]. a/ G2 ^' j, BDecisions:
1 P" {8 Z) T* Q  x. ~" nAd 1)
An intermediate situation not covered directly by the Standard shall be determined by
0 M* i0 r  F* U5 J) m) k1 Gconsidering it as an extension of the most appropriate example from the Standard. An example
5 ~, ~% F( B! W, jof the methodology is given in the Explanatory Notes to Question 2."
Ad 2)
The example shall be judged without any bridging of the corner in the cut-out
. [- q& @$ n6 B$ M$ @
creepage = 2,8 mm, no shortcut applicable.
Ad 3)
8 M) j. N5 w" E; T' h- uThe sentence shall always be applied whenever the required clearance is less than
0 w& O2 b! u# y1 Z2 a1 n3 mm and the allowed reduction of the minimum dimension X shall be referred to 1/3 of the
required minimum clearance.
! _( B* c* K- q) D$ l7 O( R# u