DSH 230 screws and connections

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小型摆管淋雨试验机

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家电125mm试验指

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IEC60335试验指甲

DSH 230 ; R7 W( r7 l# [# L

screws and connections 0 a# @. D7 C9 A1 h

28.3 9 w& i7 g( f% a+ C5 Q0 t4 L( Y

60335-1(ed.2) & 60335-1(ed.3)

Standard:
: g8 f" ]) K# G1 OIEC60335-1: 2nd, 1976
, o$ W8 _/ y0 K: I  rIEC60335-1: 3rd, 1991
+ r1 w; r. B% z6 _' W) ]! FSub-clause: 28
6 S5 V0 E1 o; `5 X1 ]" rSheet n. 230
Subject: RECOGNIZING DIFFERENT TYPES OF SCREWS
7 ?) k  B: U  y$ d2 o3 l- q% J& [Key words:
-Screws
. X$ q4 Q( C8 D; H- ]# @# ~' \1 m* W-Space threaded
-Thread cutting
* S6 B: V" Z8 H8 t: \Decision n. taken at 29th meeting/1992
/ |- N5 A7 {% ~; MQuestion: In the 2nd edition of IEC 335-1 as well as in the 3rd edition the terms
- space-threaded screws,
" I$ v* a8 }# x4 p( s( i- thread-cutting screws,
- f: s) N0 D7 t3 |. y- screws which form the thread by a swaging action
are used.
: j# k! ^: f. _' C) ^, V$ j  D( GIt is more and more convenient to use different types of thread-cutting and thread-forming
( W0 z* j& W0 B0 l1 b6 \' B2 gscrews and it is difficult to identify whether it is a cutting or forming screw. The differentiation
! S7 W& }! D$ v( t+ o' D; g! cis however necessary because for earth connections as well as for current carrying connections
restrictions concerning the use of such screws are within the specifications.
6 `- l2 E6 O. C4 J4 ]; ]Therefore we want to show with the enclosed pictures what is our opinion on
this matter. We would like to hear the opinions of other delegates.
Decision: Mr. Reininger then introduces document IECEE/CTL (DE-EXP) 017/92, concerning IEC 335-
2 w) V4 A* N# c! C, H( ~1, Sub-clause 28 “Screws and Connections”, the problem being recognizing different types of
2 a0 o. G: a  ~: c; e- h) mscrews and the judgment to which category they belong.
After discussion the Committee agrees with the German document and it was then decided to
! K8 H: a- P7 Z& |4 V8 ~2 _3 P3 lput it into the CTL list of current decisions.