Screws, Creepage distance and clearance2 D2 T! V. W( J/ V! A3 K; P
21.19 ( f) @1 A4 w' j$ \ k4 F/ w' j
60745-1(ed.4)" W# O/ g: a; v8 F1 r( o% L
, z8 K. Z+ A0 ^ a0 G4 b
Standard(s): ( E. S9 J' Z% o% N+ w ~9 PIEC 60745-1:2006 , ^% J# d% ~, d' G! ~, l( P9 KSub-clause(s): D6 H5 K0 M1 h0 v+ A
21.19' y4 b* z) k* |* D& w9 n. Q! L' n: ?
No. Year+ |; |" |( G+ n# U
DSH9 n% q. o0 i4 H/ K2 e% Q* A
7549 B" j# ]/ X# v# G% J: M; k( o
2010 0 O [. l$ E. V$ H$ ?$ r% R' F& M8 CCategory: TOOL Developed by: ETF 1. o1 M4 b' x9 N. C
Subject:* E& t* r# w/ C5 C6 s7 c
Screws, Creepage & V, ], s: T$ d+ Ndistance and clearance # l' J6 j5 |( l/ G" kKey words: 2 ] I; N- Q! T- Screws; o! k K5 g9 Z3 c+ |+ q
- force - V7 ~8 L) a$ a$ z, m- Creepage distance and8 X4 i+ N% I% c8 I4 M& ~8 p
clearance6 y/ l. D( R4 l" k9 U7 R) i
Approved at the 2010 CTL 0 y5 i+ Y1 Y' ~' P+ l5 dPlenary Meeting W6 _! ?2 d" d4 B& Q, T
Question: 7 {$ D6 ~4 k( e* X: I1)! n7 T# E9 J$ f5 R, d
“Tools shall be so designed that the protection against electric shock is not affected when* d4 M! w9 P- h& Y
screws intended for replacement from the outside during routine servicing are replaced by ) v" z Z' ?% Sscrews having a greater length.”9 x& A5 D+ C& s- V
What screw should be used? Only the screws from equipment under test or any other 5 y% `8 [, M7 C* d6 u$ F( s% \possible screw?8 o. R9 o$ I+ P7 u" ~
2) $ ? [5 D: |/ D% T9 m. Q“Compliance is checked by inserting longer screws, without appreciable force, after which4 n4 }# N9 W0 E" ?; w5 |
creepage distances and clearances between live parts and accessible metal parts shall not / O0 p+ L5 }8 `1 q- T, {! ]have been reduced below the values specified in 28.1”. n# m* e; C3 o6 F& m1 d
What force is to be applied?. b# U. [: S- e% u
Decision: ( a9 _5 B2 q2 j2 ?1) 0 v* Q0 C1 i( JThe screw originally used on the equipment and any other longer screw that can be found , B7 P# D8 f! R- V) Don the equipment is to be used.% n' T/ j& n! M/ ]
2)% q: |2 d( v# u! {$ [! v; z& ~
The force values in Table 9 shall be applied. 2 |- @9 l6 f5 P2 F0 P1 n. R[attach]77271[/attach] ; ?% y# Q- K; X; M; I7 C
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