DSH 754 Screws, Creepage distance and clearance

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DSH 754

Screws, Creepage distance and clearance 2 m' m* D" P" F8 C0 ~

21.19 * B( A0 t7 T7 r! \) Z; N

60745-1(ed.4)

Standard(s):
& J9 W: p  V' k0 n( }IEC 60745-1:2006
6 m! G' F0 J; x3 p4 X$ O3 LSub-clause(s):
  G$ r! f: y8 U2 }' g21.19
No. Year
DSH
754
' ^0 K8 P# g5 f. C% I0 [2010
Category: TOOL Developed by: ETF 1
Subject:
Screws, Creepage
% n; ?+ ?8 t9 n7 D2 m- \+ bdistance and clearance
Key words:
- Screws
# I7 `, N" A. n) L' V- force
- I1 b& }+ b0 \. C/ c: y2 y) i" Z- Creepage distance and
clearance
) x+ k1 R! s6 F7 P, C  xApproved at the 2010 CTL
Plenary Meeting
- |; z3 k3 |( I* tQuestion:
1)
“Tools shall be so designed that the protection against electric shock is not affected when
8 h5 T9 [6 L. [! ]& V6 f% rscrews intended for replacement from the outside during routine servicing are replaced by
3 u* p1 j/ G. l: D) f4 K) cscrews having a greater length.”
4 T5 R9 x( k9 s6 g/ R; H, X5 hWhat screw should be used? Only the screws from equipment under test or any other
/ u0 w6 J9 ]" @1 Qpossible screw?
2)
2 r2 Q+ D  t) {6 e/ \. n8 z“Compliance is checked by inserting longer screws, without appreciable force, after which
* S. w# K- |6 Ucreepage distances and clearances between live parts and accessible metal parts shall not
6 m: Y+ s/ z4 \2 q' d1 U, {have been reduced below the values specified in 28.1”
+ [& G+ ~0 d+ P( _+ JWhat force is to be applied?
  V8 i7 L+ s1 R$ q  RDecision:
1)
* n) h% s# s2 o- x6 P) XThe screw originally used on the equipment and any other longer screw that can be found
9 ?, c0 |0 i) E! don the equipment is to be used.
2)
  t+ `8 a# ^& v7 cThe force values in Table 9 shall be applied.
. _4 o7 Y6 o) S
' E" C( c- G7 F0 x7 w