DSH 754 Screws, Creepage distance and clearance

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DSH 754 " H" Q% y" I7 \" K

Screws, Creepage distance and clearance & Y* w  v: d3 C0 H

21.19

60745-1(ed.4) ; G$ d% T1 \. g* v/ w' _$ Z' j

. x. z# v5 F, V. w  g% @Standard(s):
( v, P" ^* u0 m4 f' J- O. t1 p  G8 OIEC 60745-1:2006
Sub-clause(s):
21.19
  C7 Z( h. v2 b& G. R7 DNo. Year
DSH
754
+ f$ W. G1 ]9 m( z0 m2010
9 J" G0 M8 t5 q2 cCategory: TOOL Developed by: ETF 1
9 F0 d, `3 B1 V- n/ zSubject:
Screws, Creepage
0 e9 g7 E7 j* N9 d2 W& D. `( adistance and clearance
Key words:
- Screws
- force
/ i  B5 T+ H' |' `- Creepage distance and
' d* B5 c- _, T" sclearance
+ w$ t) |5 P  v6 R6 f4 qApproved at the 2010 CTL
Plenary Meeting
Question:
% x- V  ^4 g7 H! N$ E# h1)
“Tools shall be so designed that the protection against electric shock is not affected when
screws intended for replacement from the outside during routine servicing are replaced by
screws having a greater length.”
1 z6 i+ ^6 Q7 x  g. @% Z; u# a$ @8 RWhat screw should be used? Only the screws from equipment under test or any other
2 |2 f4 g& H; e! p; J- Spossible screw?
  o7 E% j$ C8 M/ v2)
“Compliance is checked by inserting longer screws, without appreciable force, after which
creepage distances and clearances between live parts and accessible metal parts shall not
% U9 ]9 r$ q0 l# Rhave been reduced below the values specified in 28.1”
% D' t5 H) ?) [( uWhat force is to be applied?
Decision:
1)
The screw originally used on the equipment and any other longer screw that can be found
' y; p- Y5 k1 X1 z3 S& Y7 B8 pon the equipment is to be used.
2)
* c/ n- _3 O5 ~The force values in Table 9 shall be applied.
9 j' |8 z* R& N/ A0 U; T
/ W1 W" P" B* s. M6 k9 C# N