DSH 754 Screws, Creepage distance and clearance

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DSH 754

Screws, Creepage distance and clearance , [+ G3 @* A5 b7 I3 e

21.19 1 r6 c. k- g! W/ a; q

60745-1(ed.4) * o4 H# S1 a0 w& O5 u1 X$ H

2 k4 A, X) \% W8 q5 z6 g" K8 O. DStandard(s):
' ^9 d8 Z! U- y' c& y& K: XIEC 60745-1:2006
' k0 e+ S5 x( D- B4 k7 k& LSub-clause(s):
21.19
' K4 I) h0 {4 U7 hNo. Year
DSH
754
2010
& @# h  C: N& j; s5 q: ]# vCategory: TOOL Developed by: ETF 1
5 U& z* U/ }6 y7 A) F9 eSubject:
Screws, Creepage
distance and clearance
Key words:
7 w0 p# J3 D" k+ K  n% @$ ]- Screws
0 U# ^  P# U  q; v- force
. l  L+ m9 b' }+ J1 L- Creepage distance and
clearance
' ^" B/ n; S9 J7 c0 nApproved at the 2010 CTL
3 y! ]: E7 o6 c; M6 h( c$ D2 |Plenary Meeting
Question:
% r% ]' q. E2 ^% a! i1)
“Tools shall be so designed that the protection against electric shock is not affected when
- a. T& k9 ]( l4 o9 P) \screws intended for replacement from the outside during routine servicing are replaced by
7 w9 c3 O( E5 {screws having a greater length.”
What screw should be used? Only the screws from equipment under test or any other
' K8 |* m7 C* ^# M$ f2 g- gpossible screw?
2)
- w, J1 V% h: Q: b“Compliance is checked by inserting longer screws, without appreciable force, after which
$ g. [" a% t/ K' pcreepage distances and clearances between live parts and accessible metal parts shall not
have been reduced below the values specified in 28.1”
9 B% y8 p! z8 ~  y* s  I& a/ SWhat force is to be applied?
, V5 s& S$ u: i  R& [  f5 ^Decision:
1)
  p9 p. x  |' i7 i' F1 w, ZThe screw originally used on the equipment and any other longer screw that can be found
on the equipment is to be used.
% r: N2 n5 W, _2)
0 ?3 B# d4 i  @& V: aThe force values in Table 9 shall be applied.