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| DSH 754
3 f1 h9 W7 ]3 U; ` | Screws, Creepage distance and clearance" S( ]1 r+ y! P8 S: g+ N
| 21.19
6 Z* Y. |: P1 O8 T6 X. [* g | 60745-1(ed.4)# S4 C1 b: }7 E
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- ~' w. g9 Q- _7 g4 WStandard(s):6 C$ }/ y3 A$ x+ N3 Z: l; n |0 V
IEC 60745-1:2006* a0 Q+ a3 R' E3 d" Z# t
Sub-clause(s):
' s) @+ ~$ u' ~* Q, J/ y! f8 S2 Q21.19. o4 ^. x' M0 H q7 B9 S
No. Year
: g% [ I6 v' R7 F. HDSH
. ]0 G& [% V$ Q# h! B754
6 L0 J; z; ^6 [/ M3 j2010
5 B! T8 j x: i) q' MCategory: TOOL Developed by: ETF 1
# n l5 A9 |. \! |2 uSubject:; @ n! @, M3 Z! ^, \) ^8 w
Screws, Creepage7 w$ e1 k7 y/ m* I2 x
distance and clearance" j* v. u- h8 a& X" v
Key words:
# c7 \6 F1 g1 V4 p3 h- Screws2 D& h( U. i$ _* H! L% S4 l: S& H! w
- force4 `7 C' }/ c& D0 j
- Creepage distance and; ^5 _4 W: m8 a+ C$ j0 i8 E
clearance. [% r$ ?2 F4 P; A! A
Approved at the 2010 CTL
. u7 C' h% c% {' CPlenary Meeting N7 E3 a/ S) X2 f# x: j
Question:
+ X6 J2 Z$ G, v# t* k1 _1)" p7 E7 J. E# ]. z4 \# l( R9 a
“Tools shall be so designed that the protection against electric shock is not affected when5 U% V+ |! W6 O
screws intended for replacement from the outside during routine servicing are replaced by
, S" m+ B" @: U) ]/ jscrews having a greater length.”9 M9 V! D g3 l% _. o' r# P
What screw should be used? Only the screws from equipment under test or any other
5 p* H- k( r+ S$ n" @) r- Ipossible screw?- E$ ~8 i( x" U; T, p# c- B
2)
6 K' B$ m9 v; m2 K# R' X: S“Compliance is checked by inserting longer screws, without appreciable force, after which }- v5 N. G( e0 r
creepage distances and clearances between live parts and accessible metal parts shall not. Z& K a9 O1 i# @3 p$ a# V% c8 E* u
have been reduced below the values specified in 28.1”
& Q6 {+ F' o1 H9 U2 c# v/ H7 A- LWhat force is to be applied?
7 ~6 C9 d% g1 P5 dDecision:
* W5 n! [$ d6 a- W6 w" u3 k1)
5 T( }1 G9 o+ x: k& ^7 VThe screw originally used on the equipment and any other longer screw that can be found1 ^& E+ V$ T) f5 y0 ~1 A+ `- K
on the equipment is to be used.* |5 R3 p$ Z: \& W9 I
2)$ t6 O" a% |7 h/ t% _- D, p
The force values in Table 9 shall be applied.8 z. s9 [( ^& h! Y; s3 }- ?, ?
4 f( Y/ b5 c( c$ U
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