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| DSH 754: M. `# v7 E9 L0 \. g% c& ^
| Screws, Creepage distance and clearance" k7 c% _+ l" @/ F3 ^- B+ S
| 21.19
x: n- l, o9 |( O4 T | 60745-1(ed.4)* g. S$ u7 Q0 b
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8 d) p m3 L" Y$ B. X' aStandard(s):
7 {; W: l6 I& ZIEC 60745-1:2006% ^; z7 x) n2 H, l& \
Sub-clause(s):9 E% n) E, Q2 B+ w8 i1 q
21.198 Y: R* e h' U
No. Year
5 h! `- B6 T; S0 b# X' \0 {DSH% \& _; S$ ? Y- H8 a
754
W" J2 d* l. Y9 Q2 `( R( `* Y20103 |$ G% C3 {, S* S7 ?, K
Category: TOOL Developed by: ETF 1
# @, T" E4 { Q9 OSubject:7 U) p$ `% w2 v6 u& z( E
Screws, Creepage/ b/ F: W2 I- J8 I
distance and clearance
V u+ S, ~5 p. U" ]: Q; hKey words:. `0 A+ C* a6 v
- Screws
7 G6 t: G1 R" a$ m7 @. | G- force
9 o$ v: s& P- t- Creepage distance and9 ?2 H0 _' j) v( }( \, m8 n
clearance/ d$ O) R) G+ L- z, Z* b& p7 p# a
Approved at the 2010 CTL
) E( d/ U( T; A' u: ZPlenary Meeting& X# s, \. C! U! s. [) p. J
Question:
5 }* B6 o3 _0 _2 e" }! v3 a1), h! D4 N k! j4 p& L3 c9 y
“Tools shall be so designed that the protection against electric shock is not affected when: H8 d7 C2 h, h, j1 u2 B
screws intended for replacement from the outside during routine servicing are replaced by
* a3 k+ w- ^: U' C) U) Y( U& h( Dscrews having a greater length.”) y1 w1 C. C1 | p2 Y
What screw should be used? Only the screws from equipment under test or any other
* P% v) K; ?' W7 f9 g. Wpossible screw?/ _& N: R/ Q% g' d+ K
2)# ^1 A' Z9 O! n3 [3 {
“Compliance is checked by inserting longer screws, without appreciable force, after which
6 T* u T4 n, K* ?8 Acreepage distances and clearances between live parts and accessible metal parts shall not, g. A( {; | T- p" u# z/ j5 S# s
have been reduced below the values specified in 28.1”
S. G9 ?7 ^( Z( g. cWhat force is to be applied?
) y% U' z1 P8 K4 ]5 c: HDecision:
4 L/ w$ E5 Q' _3 D4 E# X" @1)7 W0 j* r# z, |
The screw originally used on the equipment and any other longer screw that can be found* `; W/ a: E( ]5 y3 \% k' ~& B" R/ W* I
on the equipment is to be used.
3 T4 B! r. O$ \" a0 n0 F1 m2)8 o) Y# z9 S; i+ J$ L
The force values in Table 9 shall be applied.
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