DSH 754 Screws, Creepage distance and clearance

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DSH 754

Screws, Creepage distance and clearance ; K- }0 k8 i% A5 T7 w% h; b

21.19 # K: n+ r2 J1 ^0 ?+ X, k

60745-1(ed.4)

8 Q- w/ R7 @# u* C1 hStandard(s):
% r; l! u9 I2 C' ?0 F: ZIEC 60745-1:2006
3 O7 @: r, G& t0 y8 r" |Sub-clause(s):
21.19
No. Year
& B, [8 v- Q/ ^' s& p4 ^7 xDSH
754
2010
Category: TOOL Developed by: ETF 1
Subject:
8 U( x  T7 p: e) |2 zScrews, Creepage
distance and clearance
Key words:
- Screws
- G, X+ k+ X; D: \0 D- force
  p4 |1 ~4 U+ G; u2 P: e! y2 }- Creepage distance and
/ S' s6 I" g2 E: T$ Iclearance
0 V4 z) n4 G- b. Y0 bApproved at the 2010 CTL
" j1 d* s& _8 n. V6 |5 fPlenary Meeting
Question:
1)
4 l3 S4 `8 |; H# m) O: h5 D“Tools shall be so designed that the protection against electric shock is not affected when
( J7 _* f1 V+ ?! Wscrews intended for replacement from the outside during routine servicing are replaced by
1 l) A1 Q$ K3 `screws having a greater length.”
What screw should be used? Only the screws from equipment under test or any other
possible screw?
  C' Y1 L1 a3 f7 t1 s' q0 ]2)
“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
have been reduced below the values specified in 28.1”
0 z) s6 P  F' m0 ?% i# JWhat force is to be applied?
% V  N: C5 t% z9 F: GDecision:
1)
% y/ b$ c. u) yThe screw originally used on the equipment and any other longer screw that can be found
on the equipment is to be used.
2)
The force values in Table 9 shall be applied.
! q& z) ?5 |2 A- e7 u