DSH 230 screws and connections

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IEC60335试验指甲

DSH 230 ( n$ E2 R% e3 Y1 |# x7 @9 n

screws and connections

28.3

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

Standard:
- d) x; v* {% mIEC60335-1: 2nd, 1976
IEC60335-1: 3rd, 1991
& Q" \! I0 |) N: W. L) S; N, a1 ]9 gSub-clause: 28
Sheet n. 230
Subject: RECOGNIZING DIFFERENT TYPES OF SCREWS
' v. l) Y# l) Z& ?+ i9 @Key words:
-Screws
9 l/ o2 `6 D3 f+ b/ K" f-Space threaded
-Thread cutting
Decision n. taken at 29th meeting/1992
. ~/ p6 n2 \. |0 }Question: In the 2nd edition of IEC 335-1 as well as in the 3rd edition the terms
- space-threaded screws,
7 K+ c' C; c( C4 M. e4 a- thread-cutting screws,
- screws which form the thread by a swaging action
& J& }; p5 w. G" n& A* Kare used.
: P9 H6 u; p7 [It is more and more convenient to use different types of thread-cutting and thread-forming
7 T5 R7 q  W# D$ p! i6 e- i# rscrews and it is difficult to identify whether it is a cutting or forming screw. The differentiation
1 R* S/ M; C: a$ qis however necessary because for earth connections as well as for current carrying connections
restrictions concerning the use of such screws are within the specifications.
Therefore we want to show with the enclosed pictures what is our opinion on
8 H! I7 X  @5 ^' vthis 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
screws and the judgment to which category they belong.
" n2 W: g* P" g$ d8 J; @3 h1 oAfter discussion the Committee agrees with the German document and it was then decided to
put it into the CTL list of current decisions.
( e* }# ~7 Z1 E: n- _8 F
/ A: h& I1 B% Y& O6 p( m6 U8 G