|
| DSH 7549 ~$ A0 a) b* s5 `) v0 a4 ?
| Screws, Creepage distance and clearance: t4 }5 x3 e Z9 d! m& ?8 Y7 l
| 21.19 E N6 a$ a+ @" T# x
| 60745-1(ed.4)+ v2 W; G# h4 D; t' w) n. P. Z
| , f0 _8 a5 H" n: ] c$ e
Standard(s):" O P( n3 w1 {* ?' G( @1 V2 ]1 ~
IEC 60745-1:2006- l6 x( g) K- W7 t4 q9 `
Sub-clause(s):! v6 Y7 r2 o0 ]+ R
21.193 d+ S& T% w1 w+ s* d
No. Year
8 b j" a; a/ H2 P4 wDSH
- [3 `' ^& e5 a7542 e: F; i0 d% p2 r; e
20101 O+ n G9 I |; Z5 }% @; F
Category: TOOL Developed by: ETF 1
% `( l2 o( @7 F( c, s' d) LSubject:1 ~# @; t' I2 k! R
Screws, Creepage# T j% O% i3 J: e$ |3 v( h$ i! }" H
distance and clearance7 n7 u8 f' W, a+ G& r/ n: \0 G
Key words: c: V9 R: o$ j+ L" o8 P
- Screws6 M' S8 ]( E2 \ ^# {5 o
- force7 r# s9 b) N, w; Q5 p
- Creepage distance and; u9 _$ D: D5 X# f& T6 Z* o* Q' j
clearance) `+ `! e9 T8 N# n7 X
Approved at the 2010 CTL
4 a1 l& U: ?' Y4 QPlenary Meeting
$ X+ D( g" G( \$ NQuestion:
( W' i* t6 s9 A1 C$ u3 J- c! Y+ ^1)
$ N& F4 ?3 ^5 w. p* b% p“Tools shall be so designed that the protection against electric shock is not affected when
% o3 n! B' j8 lscrews intended for replacement from the outside during routine servicing are replaced by% A# E+ a D2 S) J4 w' N) J8 h
screws having a greater length.”
8 `. G+ G- T; N2 W O# B* kWhat screw should be used? Only the screws from equipment under test or any other; S5 b* c: _$ |: ~+ w0 a' X
possible screw?! O* e: D- ]! w& c' _7 \0 `4 h1 c
2)
/ h5 P; y& }* g# J1 j$ M: v“Compliance is checked by inserting longer screws, without appreciable force, after which. c- A3 _' M0 D6 }5 t+ k2 n& t0 t4 C
creepage distances and clearances between live parts and accessible metal parts shall not: Z. ^+ V" h( ]2 i
have been reduced below the values specified in 28.1”/ s! \# q' E: q) u8 {8 B) S! I' q
What force is to be applied?) |3 ]" i* b" k6 `! o- R* [' o$ j
Decision:
; [ O2 z A6 r9 g, w" {( I, L1)& X' i6 s: N. T- l
The screw originally used on the equipment and any other longer screw that can be found
4 d, P# ]" L! v4 r) }7 K( hon the equipment is to be used.
% V! L: J- q' }; P9 K& D2)
* T' `1 ]7 ~# x# e9 d2 e) ?7 G$ K4 AThe force values in Table 9 shall be applied.
+ E! t/ m9 I; B+ I8 g8 y! ]6 |2 k. u! Y$ c1 T. o& F
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