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| DSH 7548 R7 W. ~- W1 q* H/ C0 S
| Screws, Creepage distance and clearance' r" Q6 R5 g! ~3 l5 A8 @: A
| 21.19- ]! O. x% ?6 w" l5 |- z
| 60745-1(ed.4)) v# U7 ~8 W7 z6 N0 y' E+ F
| 7 ?* _ v2 j* I2 }- Q5 L& ]
Standard(s):, Z. g3 r. l+ I7 A r4 c
IEC 60745-1:2006! k: G+ u2 K. I5 a4 E
Sub-clause(s):! @# w$ }3 m1 a) G' V* q/ I
21.19
& H8 s% j3 H$ R R7 P8 cNo. Year% o7 ~6 W" ?: O% R6 X8 I( L
DSH2 _" v- c! O# x* Q
754
l* |. Y& R" h, `' K6 K2010' E+ E4 r( E$ {' \1 f
Category: TOOL Developed by: ETF 1& t- B; ^8 s1 M. g- r/ ~1 c
Subject:" c0 ~9 s/ S$ r
Screws, Creepage
5 H Q5 A; u1 i7 f8 v% u; X- tdistance and clearance
5 c$ L& M6 L# Z& Y- [Key words:6 f5 H& h7 o7 K' M: ^
- Screws; v* ]) s. Y+ [8 G8 M4 ^
- force6 }2 S2 M5 h4 ^: \' X
- Creepage distance and
+ X/ S6 ?( l) n' S) z7 Hclearance) g2 `& b$ J8 @# y( Q( i
Approved at the 2010 CTL& M- X' b( k. ~+ C j) _0 N
Plenary Meeting; |! F2 a6 m7 x9 p0 N- w. w$ X
Question:# ^8 _0 {" p! B6 B3 ]
1)
) G4 s% K/ }' R* }( U# g; F" D“Tools shall be so designed that the protection against electric shock is not affected when
3 W$ f# E |9 m4 J( Jscrews intended for replacement from the outside during routine servicing are replaced by3 I8 |4 Q- a- L- i2 t# h: I
screws having a greater length.”5 d$ l- @ W: w6 f# o, W
What screw should be used? Only the screws from equipment under test or any other( V+ R' j. s* c: ]1 a% X
possible screw?8 u7 o0 {6 `$ i
2)
% @8 C3 m. \, Z“Compliance is checked by inserting longer screws, without appreciable force, after which
' q# ~. z) T7 f# T; d o/ \creepage distances and clearances between live parts and accessible metal parts shall not
& B. }; R: }# Z; Ihave been reduced below the values specified in 28.1”# b' `) V5 T, |, V- x1 W# N
What force is to be applied?
2 M2 J& |4 c6 ?/ \9 `& P# l1 g' tDecision:- q% a8 j- H' |
1)
. O" B$ }. f# a# JThe screw originally used on the equipment and any other longer screw that can be found
" K7 O9 M; @7 W; `! fon the equipment is to be used.
9 h8 z+ a# ?6 g' y2)' w7 j( v# `8 ?* O; k* G
The force values in Table 9 shall be applied.
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