Screws, Creepage distance and clearance6 C. z% k1 Z6 x1 B* {* T' o. ^# p+ W
21.19( Z6 Z5 p) I6 L, [$ }" ^
60745-1(ed.4). j- l: ^$ E. H0 z! `
) d @* \ U2 UStandard(s):- z, k6 W6 c7 x8 g
IEC 60745-1:2006# t$ h3 x! g, K" V+ q
Sub-clause(s):2 A, V8 H, w7 m4 a; t- N
21.19 ) i$ ^. C1 r# eNo. Year 9 k: F! u0 ?7 z7 E5 eDSH ; d4 Q( \& J6 ]0 a5 \754 . L5 C; S0 S: N+ d. p20105 A: t Q2 e( N& O- a4 X
Category: TOOL Developed by: ETF 1 . K; @$ \! t9 K1 x3 wSubject: 2 R1 V( o. {: {3 y3 ~, l: iScrews, Creepage % ~5 V& w' F# s0 K4 y1 P4 Hdistance and clearance 5 k4 |9 C) T( D, bKey words: # n; r; S" c( {0 i! Q* }- Screws * C4 s2 _4 E; D- force + o& I! t* F; ^8 t9 Q- Creepage distance and+ J, s3 Z6 N0 h1 `( k! n
clearance- r7 i- U; P; p/ v. A- Q; B, t8 d4 e
Approved at the 2010 CTL / K; Q1 V% b6 vPlenary Meeting : [+ z: M. U0 k2 [7 I2 f% qQuestion:9 ~7 D4 ?. }4 J/ P+ W1 V) y
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“Tools shall be so designed that the protection against electric shock is not affected when 5 e$ c% N* V, Y: d: H. bscrews intended for replacement from the outside during routine servicing are replaced by/ W- _( d& z9 @5 k
screws having a greater length.” , f1 T5 N5 g* o% j7 XWhat screw should be used? Only the screws from equipment under test or any other; b I' ?7 r6 F' d- l- r" j
possible screw?& a7 S2 x1 w$ \' T3 y- W
2)$ @* C. V4 }- X7 ^
“Compliance is checked by inserting longer screws, without appreciable force, after which- X$ U* t/ S2 q% w, T+ l* Z
creepage distances and clearances between live parts and accessible metal parts shall not * z" D% r( ^6 F; M; F, bhave been reduced below the values specified in 28.1”& ~4 \# x( i& }, R1 |' \
What force is to be applied?' S8 {5 }8 v; l: j% u) R
Decision:0 x1 w& C( N7 z5 F6 V3 b
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The screw originally used on the equipment and any other longer screw that can be found 5 M2 X! R; w) Z( a% B4 @# don the equipment is to be used. : _; ^2 k: H7 g: `$ s1 B2)( r2 L; x5 s8 s5 r: X
The force values in Table 9 shall be applied. & h+ L2 _7 @5 {# u! V* t0 q[attach]77271[/attach] 6 _+ Q: G# o- ^- N {4 e: K
DSH 754