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| DSH 754
" I% v, X. p( Z | Screws, Creepage distance and clearance
$ H% k/ m b5 h' Y' Y# G | 21.193 J' G! [$ R) U) \8 o: V- z
| 60745-1(ed.4), T3 B7 j/ a1 x9 Y( u! Z4 k
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% F7 b7 R8 T: D- Z- h9 O* tStandard(s):& G+ D! x. F9 F. L
IEC 60745-1:2006
$ r2 ~ q# }/ H* A/ V USub-clause(s):
" r- v2 _& m$ c2 i0 P5 y21.199 }. j+ `* n7 E5 T( M; J) @
No. Year* k( j- t% D5 L) ]5 [5 j( u/ j# z
DSH* U" f% k2 E3 ^ }. m
754
! g, y8 G# W) ~% z8 G2010! q5 p7 }+ E9 G6 g# C l" m6 z
Category: TOOL Developed by: ETF 1
I9 M X1 H' L3 Z# r" ~: ASubject:8 [$ n% O7 F* E7 H% O
Screws, Creepage
) ?4 U4 ?& f' R4 |distance and clearance" t# |2 ?$ y9 @6 a9 h: J R" {
Key words:7 J& e0 B* o V# F u, u' M$ U
- Screws6 Y- w: D/ r& v6 T
- force. N$ E! u4 k% w+ U& e
- Creepage distance and6 v _0 N; d% s# \" @2 `6 E
clearance
/ {2 l- c0 x) p. D HApproved at the 2010 CTL
7 V- T9 j" m3 S' g- r; t% K! S3 WPlenary Meeting7 f( c. D k2 H! Z: r M
Question:
( `5 k/ m( }! }7 s x' Z! z1) G% ^3 o% B' c" G0 o6 ~! S6 W
“Tools shall be so designed that the protection against electric shock is not affected when
) u Q; N ?' V `8 l! nscrews intended for replacement from the outside during routine servicing are replaced by( ^6 e0 ^! ]3 T) W
screws having a greater length.”4 V0 [ c, t0 _3 |
What screw should be used? Only the screws from equipment under test or any other
& j& M. s4 b6 w7 A8 {+ wpossible screw?
1 r! D( x0 c% A3 o! L% D& |& o* f2)% S* m# b: V. j+ `8 ?
“Compliance is checked by inserting longer screws, without appreciable force, after which2 w/ S- {# b, O: D& P
creepage distances and clearances between live parts and accessible metal parts shall not
* ]& ]- c3 n% l$ R3 n) ]have been reduced below the values specified in 28.1”8 P# ~: L5 [& v/ v& o8 P5 V
What force is to be applied?
* A6 s7 J5 [6 T- E; TDecision:$ u4 ]' ]3 ^5 d
1)
- L! j3 X' T( @! N) O) BThe screw originally used on the equipment and any other longer screw that can be found, i: C/ j* q* c# q8 ?0 I
on the equipment is to be used.
9 M" ^7 b) T3 V/ }: ]2)
9 a( g! q. c3 m6 e. I% ?6 `1 ~The force values in Table 9 shall be applied.
9 ]8 P# M0 B6 s" G& B2 i* b9 F; O( y6 |- L0 ^
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