DSH 754 Screws, Creepage distance and clearance

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DSH 754

Screws, Creepage distance and clearance 5 Y$ P+ |$ o" a# D- ?( t

21.19 2 U0 ]1 U* M/ R6 N; n" L' }

60745-1(ed.4)

# o( o, M7 c% [3 d3 NStandard(s):
- l, g( `0 {5 F) |$ s5 _IEC 60745-1:2006
4 Q7 _: H! @5 @: f8 r4 cSub-clause(s):
' F* b3 f, H1 d: ^& Y6 K: x21.19
/ x/ H# ?# A  o2 E3 ?: j, XNo. Year
1 L+ u) A8 d5 N8 Q0 v( t+ Y2 jDSH
8 i  [" i1 P2 X  w  C& @. d" k$ E754
7 z+ \( `, \1 U' k7 [2010
Category: TOOL Developed by: ETF 1
Subject:
# A8 H( E$ Q* m1 l% \+ s6 Z6 vScrews, Creepage
- G) H- m" g7 ^& q5 Ndistance and clearance
4 v/ q, O( b6 J& o, J$ IKey words:
5 k1 w8 A; U+ v. W1 m, ?) y1 M- Screws
- force
- Creepage distance and
clearance
Approved at the 2010 CTL
Plenary Meeting
Question:
" U# G/ A0 ]7 X* K- K) {+ D+ a, I1)
. G( Z7 g! t9 g, p( P“Tools shall be so designed that the protection against electric shock is not affected when
6 x4 k) {8 X  F* S8 |4 ascrews intended for replacement from the outside during routine servicing are replaced by
+ c0 @5 T4 R' j; ?2 ~$ U  _screws having a greater length.”
5 m: T+ n6 `5 [! y+ BWhat screw should be used? Only the screws from equipment under test or any other
possible screw?
& x, ^& d4 M& ^4 J: r: T, D+ j- Z$ K2)
8 ?. b5 q% u  E. Y. J+ U  U“Compliance is checked by inserting longer screws, without appreciable force, after which
4 O3 a4 k$ f5 ]) w9 O' Ocreepage distances and clearances between live parts and accessible metal parts shall not
. H' T' Z" ~: H* R- t/ a+ Zhave been reduced below the values specified in 28.1”
8 z" Q7 W8 V2 a  o; aWhat force is to be applied?
Decision:
1)
The screw originally used on the equipment and any other longer screw that can be found
on the equipment is to be used.
  H  ~6 _/ r; A4 u+ K' o- B2)
The force values in Table 9 shall be applied.
. s, T1 R/ O! I