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[TOOL] DSH 754 Screws, Creepage distance and clearance

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发表于 2012-11-8 15:26 | 显示全部楼层 |阅读模式
广东安规检测
有限公司提供:
DSH 7547 Q. |. d8 S8 p. m+ H9 B
Screws, Creepage distance and clearance
# e) x  b, k3 `! S( D- ^
21.19
+ r+ v3 S+ Z9 S7 e0 R
60745-1(ed.4)( y' F4 M7 |- A  K6 N; ~
/ T( y7 }2 a$ C+ C3 G
Standard(s):: }9 V: H! V- z+ p: L
IEC 60745-1:2006
1 x8 g' C# h7 FSub-clause(s):
; A, ?3 `2 J: r) C: z21.19
  `' m& v  n5 K9 h9 BNo. Year
& L- E) D- ~. I7 Y2 h3 p$ i, W2 oDSH
- {: M. v$ r3 U754
% [  p! t& |$ V; T3 H$ D* z/ ?2010
# q# G) }) |$ |6 l0 lCategory: TOOL Developed by: ETF 1/ A* W7 \+ b5 E$ V9 {1 `9 q. ]
Subject:
! b5 j# ^9 O; P+ ~6 D4 ^, cScrews, Creepage
. `9 G% ^2 ?2 r6 l, @( Zdistance and clearance
6 P3 L, \% |# ~: S4 l" HKey words:+ ~: C- I$ A/ X, X
- Screws) R! `9 D8 n3 M  K5 B
- force; U+ q" Z6 B2 g3 R2 z
- Creepage distance and- e1 k1 I2 I  e# p5 N& [9 t$ z
clearance) h, v, O3 K3 f0 e5 P
Approved at the 2010 CTL
. g) b" v) ?$ ~; g* n. u* xPlenary Meeting; I3 a: g% Z6 c$ }# t3 U
Question:  E* q$ M3 P! C/ g; b3 V
1)( i% y2 ^3 ^( |* h4 D7 k' t
“Tools shall be so designed that the protection against electric shock is not affected when
: |- K0 x4 t! m9 g* k& n. s2 \2 Sscrews intended for replacement from the outside during routine servicing are replaced by( G+ z+ x+ p) b- u( n( {) V& p% ^
screws having a greater length.”
; D% N8 \( T1 p9 Z! Z# A7 iWhat screw should be used? Only the screws from equipment under test or any other
2 y2 @: v; x) N+ K+ T) S+ j: [. Lpossible screw?
7 B. p( N% L, s$ F  `; \% y  F7 E2)
9 i  E* ^2 \- k$ \. q& u. B“Compliance is checked by inserting longer screws, without appreciable force, after which& r6 F+ }  f2 G0 T
creepage distances and clearances between live parts and accessible metal parts shall not
4 q5 \7 j4 h2 y0 ~) ]- fhave been reduced below the values specified in 28.1”  D8 F. k' h3 w5 {9 T8 O( K
What force is to be applied?
$ N0 E: o' [/ eDecision:
8 V9 X) n0 U1 Z7 d1)) c9 b5 }' k$ P3 p  x2 G1 J
The screw originally used on the equipment and any other longer screw that can be found
4 w! M+ b! W. g' J( z0 {) y4 G9 {! aon the equipment is to be used.. W" n1 O9 S! c) G# r5 l, w
2)
+ J0 O0 W$ j* z# C3 F- eThe force values in Table 9 shall be applied.
2 t$ R7 s! X9 l" {: d1 n5 g. M- l9 v8 X

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