DSH 754 Screws, Creepage distance and clearance

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DSH 754 ( x5 y: D3 J6 w4 X2 v. A+ @# h

Screws, Creepage distance and clearance + d3 c) W2 M7 G3 U: M. T% q  t

21.19 : k. d& k' E$ y- X

60745-1(ed.4) " \9 D; J. {3 E1 r  `. m' O) ^$ O

" G2 K; a  |$ M8 ^% S; TStandard(s):
IEC 60745-1:2006
Sub-clause(s):
21.19
7 d6 c& K( m3 I% P. }0 X  Q0 J+ J! ZNo. Year
DSH
754
/ M: _5 f# |# ~2010
1 d# }$ t  B, y6 v. CCategory: TOOL Developed by: ETF 1
$ E; S5 q* r7 M+ s" ?Subject:
1 ^9 {1 c' t. b8 HScrews, Creepage
* |! ?) R) |$ g  a& ?% I8 ]distance and clearance
Key words:
- Screws
0 ~' h5 q9 l4 I5 f- force
( R7 q. e6 k3 h$ Z; f5 s% D( |- Creepage distance and
7 c. W  e: T+ j1 q5 g9 bclearance
Approved at the 2010 CTL
Plenary Meeting
& B$ H5 s& l/ g1 m2 S# Q: G, }. dQuestion:
1)
+ S$ j% K! Y5 W( J  O“Tools shall be so designed that the protection against electric shock is not affected when
8 W2 X: b: F( ~6 e0 F6 }- y- ?& P3 escrews intended for replacement from the outside during routine servicing are replaced by
' F3 K$ ~' i" i- kscrews having a greater length.”
' I4 i- u5 j+ U$ @& RWhat screw should be used? Only the screws from equipment under test or any other
possible screw?
2)
& N  v0 M& h& e& O“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
6 ]% _! ?+ p' C. O3 M# c1 D1 Uhave been reduced below the values specified in 28.1”
What force is to be applied?
Decision:
1)
7 R% c( P! G* ~The screw originally used on the equipment and any other longer screw that can be found
on the equipment is to be used.
; y* F  i2 ]) i* E# q: e2)
; Z1 c: u5 i6 T5 w* bThe force values in Table 9 shall be applied.
9 A6 k) g( W8 ?1 s; I) O/ J9 a# W