DSH 754 Screws, Creepage distance and clearance

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广东安规检测
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DSH 754 / p* p( b, ?/ b. M. @0 e

Screws, Creepage distance and clearance

21.19

60745-1(ed.4)

8 K2 E( ^( g$ b5 SStandard(s):
) O, J4 O  c  b5 W7 o+ EIEC 60745-1:2006
Sub-clause(s):
21.19
' O2 D: a2 u5 P" b; ZNo. Year
! B: w  f: I  W% X! oDSH
754
) W- \' }' i" U7 Y2010
Category: TOOL Developed by: ETF 1
9 d7 |; n, p7 U+ C: C& Z* C' ESubject:
& N! @5 g. Z8 F, B; vScrews, Creepage
distance and clearance
5 u, K* L/ m3 p% Q/ ^5 T' rKey words:
- Screws
- force
- Creepage distance and
clearance
4 X% _" e  s" ~7 {* iApproved at the 2010 CTL
8 Q1 P5 o: R, W1 C$ ?  q$ D3 A; ~3 QPlenary Meeting
+ A9 V: y  Q8 ?# d) I- @# H3 fQuestion:
. G5 O0 ~2 l: h; s8 Z1)
“Tools shall be so designed that the protection against electric shock is not affected when
# n2 f7 D4 X/ F; `$ K% yscrews intended for replacement from the outside during routine servicing are replaced by
' c( U  Y; V7 `- E& Dscrews having a greater length.”
What screw should be used? Only the screws from equipment under test or any other
% J& Q& z0 `" ~4 G* d* z3 Lpossible screw?
2)
8 ?& R; g  y# P$ ?: T, f1 V" i“Compliance is checked by inserting longer screws, without appreciable force, after which
& ]/ r4 K: `% ^8 P+ u# acreepage distances and clearances between live parts and accessible metal parts shall not
2 J" o! a# l& D( b7 g4 r; Qhave been reduced below the values specified in 28.1”
What force is to be applied?
$ @. \# ~/ D2 G) ?3 m, V8 NDecision:
( N3 L: P0 g1 E" P6 K2 G( n1)
The screw originally used on the equipment and any other longer screw that can be found
# D8 j% a4 L4 Pon the equipment is to be used.
2)
5 j+ I5 u4 {$ J6 qThe force values in Table 9 shall be applied.
. I3 t" `2 v7 A3 C; H. `! R