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| DSH 754
6 G$ C( t9 d# M* H, D | Screws, Creepage distance and clearance
: L# N! q4 `% F, i | 21.19' s2 H- v) f9 B1 ^$ h5 n3 f
| 60745-1(ed.4)
, g/ X% E1 |$ F! ] | 3 F1 \% q. }! M: F9 z9 L
Standard(s):
/ a% R3 A w% lIEC 60745-1:2006
( n9 J" t ^% g7 J& zSub-clause(s):
1 L# g* D; @- C. a3 v' S3 ?21.190 W5 b9 R& P& Y/ A5 L) X% Q6 E
No. Year
& @" j2 p9 y* D9 \4 H9 z* L) dDSH
; g, e2 [" A8 g- ~4 S' \, l7549 D& c) `& U( G: c
2010" B$ a% G8 e; W7 L- L S
Category: TOOL Developed by: ETF 1
D0 @+ v* L& m' p; TSubject:
4 o' `" o6 o# H5 |4 t/ {* kScrews, Creepage
5 t% S& B9 w: U( Zdistance and clearance& a, R" [! W3 z1 U4 S; Q K
Key words:) b- D7 Y1 l* S+ n5 f
- Screws
* U+ T. m& I* {! j' a' N: o! C- force5 |/ n+ f4 [( T, u, A) D( E6 D
- Creepage distance and
6 B/ W; o9 A5 G; D# Cclearance7 h1 d6 Y! u. F; b) j1 F- W6 k1 Q
Approved at the 2010 CTL2 \1 F, ~- C) @$ W, V/ [! U
Plenary Meeting
. i/ L0 @ P. [% d7 TQuestion: \# C6 R! s f3 }2 y* p& G2 @
1)
- B1 c* i6 I: P; O+ f“Tools shall be so designed that the protection against electric shock is not affected when+ D, o. P4 ^! O5 }6 @8 m
screws intended for replacement from the outside during routine servicing are replaced by
+ x" m5 r: R9 V4 H3 Wscrews having a greater length.”
3 _1 a' p4 j. d- R8 h9 kWhat screw should be used? Only the screws from equipment under test or any other
! ^$ O! B: Z& G U$ M% A3 y, |! Qpossible screw?8 a8 t" s/ E2 c, u. O) `9 _
2)
* M% r: a: H4 ]0 w3 l“Compliance is checked by inserting longer screws, without appreciable force, after which5 w7 O7 h3 ]/ n* k9 C$ p
creepage distances and clearances between live parts and accessible metal parts shall not
1 ]7 Y& F; j0 x; f( H c" xhave been reduced below the values specified in 28.1”
3 N; ]+ }5 d; d- ?! V& Z4 l4 T! z. ZWhat force is to be applied?! e1 O$ O* {8 D [2 C5 E, R/ K
Decision:& L( p$ w3 Z. G: X! q K5 n& i
1)
8 B1 K6 b9 g$ bThe screw originally used on the equipment and any other longer screw that can be found
0 h& T# h9 M' P) G) } b: Aon the equipment is to be used.
( [5 J) a4 i2 e: F8 \2)
) R/ e6 {! w( K1 O! n. Y! d8 S2 OThe force values in Table 9 shall be applied.
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