DSH 230 screws and connections

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小型摆管淋雨试验机

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自动卷线器试验机

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灯具防风罩

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E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 230

screws and connections / J2 D. Q4 ^5 E" n4 q) q5 k$ ]5 q) }. R

28.3

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

2 g) b' W" H9 Z3 o5 \, I5 UStandard:
# z  e$ g. Z2 j  I* i  }; x* BIEC60335-1: 2nd, 1976
) k  m& z" X/ U! kIEC60335-1: 3rd, 1991
Sub-clause: 28
' N# m, M/ [, V( `Sheet n. 230
: h, q3 B: k: l0 o% HSubject: RECOGNIZING DIFFERENT TYPES OF SCREWS
& ~1 u! A4 q8 d; [7 h2 H# mKey words:
-Screws
-Space threaded
& L" y+ [2 G+ ?0 K! b. i* S-Thread cutting
7 ?% I/ o( M2 Y% J  CDecision n. taken at 29th meeting/1992
! E# V# u. d) C9 S6 J+ h2 aQuestion: In the 2nd edition of IEC 335-1 as well as in the 3rd edition the terms
- space-threaded screws,
- thread-cutting screws,
- screws which form the thread by a swaging action
# M- d4 x1 Y1 J: T% v: |. pare used.
It is more and more convenient to use different types of thread-cutting and thread-forming
screws and it is difficult to identify whether it is a cutting or forming screw. The differentiation
9 ^% D: p; }' c7 Y; tis however necessary because for earth connections as well as for current carrying connections
: d, p; j- g$ wrestrictions concerning the use of such screws are within the specifications.
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-
1, Sub-clause 28 “Screws and Connections”, the problem being recognizing different types of
; ]% @# z; U! `: |! Bscrews and the judgment to which category they belong.
, K9 ]+ ?: K- p( k+ [* A9 f) cAfter discussion the Committee agrees with the German document and it was then decided to
& N/ q8 Z9 f  L$ d0 v9 b! ^put it into the CTL list of current decisions.
; _; K4 m" T# q5 V! S/ R/ P: k
4 b% B  m1 [1 O3 N
* D: J: v6 ]7 d" C