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| DSH 754" U/ v9 Q) V* R$ a$ b
| Screws, Creepage distance and clearance- J& E& U, G: }) _+ X
| 21.19" W# R, F" M6 m' [, Z0 ^
| 60745-1(ed.4)2 L0 d" v2 s( \3 |" n
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+ U# D4 |# K$ u6 n# D% c3 ]8 _Standard(s):$ y) r( E9 ~- q% F+ C9 ~2 |* @( A, ~
IEC 60745-1:2006
1 r4 ?0 t: v* G5 X/ SSub-clause(s):# i0 O0 T4 d6 G- ^1 v
21.19
# \5 S: J' f5 O8 o/ DNo. Year
- ]! l7 F0 u! `DSH) X, d6 O5 a3 n, V( `% [7 H
754
( {4 l6 T8 y4 v' F- p/ j2010: g! _4 ~% q, k% e9 i' p
Category: TOOL Developed by: ETF 18 h7 |2 U" c* g p0 I1 W3 g
Subject:
2 s! F/ e% T' C" T0 d; ^Screws, Creepage" M1 `. i# Y" I' F# U* {2 Y
distance and clearance2 {! I# @. M- q
Key words:
% q8 W( Y4 e: ?. S2 ?- w- Screws
: U: e, y& F9 s$ v, ?. {- force1 L6 f: a7 X) x. e$ t
- Creepage distance and' X" |8 s: k _+ h
clearance
8 C$ |" Q3 |9 C4 W! [- z* RApproved at the 2010 CTL: n' t4 r1 g/ k, Y
Plenary Meeting
/ M* O2 D p- R1 rQuestion:6 T* o( S, Q, n% s) F; m0 ^+ G" [
1)" {8 e( G7 B* ^7 n# v1 E
“Tools shall be so designed that the protection against electric shock is not affected when7 a' u) P6 ^% _6 Y. j
screws intended for replacement from the outside during routine servicing are replaced by
) n) u1 C$ H, m3 {* F; dscrews having a greater length.”* p$ ]7 o* H% w7 O7 i8 i% i8 I# u
What screw should be used? Only the screws from equipment under test or any other. j+ d) l, d: y8 O8 n* z
possible screw?3 l: P3 _6 l. m8 M
2); Q/ ^/ R1 u/ \2 S$ Q. S/ U
“Compliance is checked by inserting longer screws, without appreciable force, after which8 x/ Y- Q! `( ^, s# a5 h0 |
creepage distances and clearances between live parts and accessible metal parts shall not
6 b5 t) S# D. m( Mhave been reduced below the values specified in 28.1”
: ?3 R; T( ?7 F+ w8 E8 Y1 cWhat force is to be applied?
9 p: @( V- p, wDecision:
! l5 c4 O0 d) c4 ]' d1)" Q# }3 X2 a, l2 \. z' d& h
The screw originally used on the equipment and any other longer screw that can be found
* n% s( u0 K8 W( Von the equipment is to be used.
) f/ w; ~( r7 Y n3 f. F2)
8 s a7 z. x3 d+ k% s- b% u$ yThe force values in Table 9 shall be applied.
& t( F" j4 K1 x; I& C0 O- [+ I/ c5 ~, T, V, p; _1 F% j. e7 D9 J
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