安规网

标题: DSH 230 screws and connections [打印本页]
作者: 小米    时间: 2012-9-14 13:54
标题: DSH 230 screws and connections
DSH 230( A; F6 b, ?6 |$ H. F
. P7 n5 M6 i" r$ w+ q7 K+ }
screws and connections! o7 }. |& Q+ f$ O) _
28.38 J6 o3 k% A$ U0 T+ ^; V
60335-1(ed.2) & 60335-1(ed.3)0 V" I2 ~; b9 f! u) ~
+ |7 u) U( `: N/ H1 S% V  B5 w7 B
Standard:/ F* ?: b$ c  |: L
IEC60335-1: 2nd, 1976
2 K5 l  J1 w0 O  OIEC60335-1: 3rd, 1991
8 F  C* _' ~$ U2 ^" BSub-clause: 28
& H5 d. g$ E7 R& p1 @4 [Sheet n. 230; p( F' ^4 z" c7 x" e
Subject: RECOGNIZING DIFFERENT TYPES OF SCREWS
$ H, a' G& C3 pKey words:
* L" @- o3 t% k1 B0 ]-Screws4 l- n9 |. T) n4 n+ e+ l$ o
-Space threaded6 m' N" b: K0 q/ l9 m: t8 ~
-Thread cutting
% S5 \5 d+ U' `+ M0 R, CDecision n. taken at 29th meeting/19927 V5 p8 }2 G. _9 x
Question: In the 2nd edition of IEC 335-1 as well as in the 3rd edition the terms: U: H' k% Q" y3 F% `
- space-threaded screws,
, s( w  p: `# d, p- }2 h- thread-cutting screws,
/ I" w9 x! U# }/ @- screws which form the thread by a swaging action6 {# l/ ^( E# @' H
are used.% Z% b# E  i2 ~" q8 S* K
It is more and more convenient to use different types of thread-cutting and thread-forming
6 D* w6 Y! v8 D# B& a3 Oscrews and it is difficult to identify whether it is a cutting or forming screw. The differentiation. M; U( I  [2 i. W% I6 W3 l
is however necessary because for earth connections as well as for current carrying connections
# d/ Q# S' e) J4 ~5 R- k0 prestrictions concerning the use of such screws are within the specifications.2 x; ^5 g* ^8 n6 g# @! `( x& p
Therefore we want to show with the enclosed pictures what is our opinion on: ~, L# s8 v, g! X* _
this matter. We would like to hear the opinions of other delegates.3 h+ M3 \3 {+ y; m0 m. Y4 ?5 N% e2 W
Decision: Mr. Reininger then introduces document IECEE/CTL (DE-EXP) 017/92, concerning IEC 335-9 M; p% n. u' q% [) j0 t& p. i: T
1, Sub-clause 28 “Screws and Connections”, the problem being recognizing different types of
, G( Z3 r6 v. m4 Yscrews and the judgment to which category they belong./ M0 b/ i0 x, {
After discussion the Committee agrees with the German document and it was then decided to5 T' @" l5 x% `* x
put it into the CTL list of current decisions., U1 W% D7 q# u: w- I+ i" T* ~! j; P
) {" k- l2 w( u" p8 b' s& X
[attach]75956[/attach]
, l+ r; F5 g0 U3 p4 h+ ?7 y4 R$ b



欢迎光临 安规网 (http://bbs2.angui.org/) Powered by Discuz! X3.2