DSH 754 Screws, Creepage distance and clearance

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DSH 754

Screws, Creepage distance and clearance

21.19 4 x/ F3 _& U) {7 d

60745-1(ed.4)

Standard(s):
1 M5 Q+ P' }2 A  N! `IEC 60745-1:2006
$ Z8 f8 x$ L* k! Z1 ?1 ]Sub-clause(s):
- ^% h7 a" A+ [21.19
* ~, G; D  v8 V0 ?4 ]No. Year
0 K  o. G) T. PDSH
( C3 f8 y& A4 B. Z$ O) A754
" x- ?) K5 g! u$ w% Q0 r2010
" G4 h* T* _8 F: ]Category: TOOL Developed by: ETF 1
8 v8 H! L, c) Y5 ~! [Subject:
* B8 v. P/ ~7 V) q. tScrews, Creepage
distance and clearance
5 F) @- S9 U3 U0 b. y$ M: cKey words:
- Screws
7 J) P2 u, A' t0 Y# Q' }' U: `) f6 t- force
- Creepage distance and
1 I6 F. b, O: gclearance
Approved at the 2010 CTL
  c$ m2 c6 w& F& lPlenary Meeting
6 |' I0 @' O2 Y! P. P) j8 D; TQuestion:
4 d! J8 D; z+ |5 k' r1 }1)
“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
( K7 _$ K0 Y5 X7 p( x( ?0 _. oscrews having a greater length.”
8 Z) ~; j8 @- v# ~0 ^! J, U* BWhat screw should be used? Only the screws from equipment under test or any other
possible screw?
2)
5 ]- l  a: Q# h- ^* h“Compliance is checked by inserting longer screws, without appreciable force, after which
' C/ ^1 `! U7 G7 {creepage distances and clearances between live parts and accessible metal parts shall not
- j, s# b! a0 i5 Jhave been reduced below the values specified in 28.1”
What force is to be applied?
Decision:
' \9 U# Z& @" c) d& l8 Q1)
# P3 v' w; z0 b3 [2 A; dThe screw originally used on the equipment and any other longer screw that can be found
on the equipment is to be used.
% Z( f; I7 W2 Q2)
: T4 S0 D/ L! D/ a! HThe force values in Table 9 shall be applied.
5 N8 s  |8 T6 ~: C- b9 `% |& h& r# |
; |# T! }" T% Y7 z, |6 t