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|  DSH 2307 k+ S8 f7 \. f. H1 S
/ R; _6 @3 g s) Z9 C9 C- w1 p3 {
| screws and connections% k, G' B2 i9 C" F, h0 k7 }
| 28.3
" Q8 T' s! `* k3 K | 60335-1(ed.2) & 60335-1(ed.3)9 a$ \' V- U- W: i4 F- i
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9 M7 N4 x3 ?% n# A( [$ i# |& yStandard:
: H4 h) f) q4 t6 Y& {IEC60335-1: 2nd, 1976# K, g& X: m: S ~2 \
IEC60335-1: 3rd, 1991
, M% k! k- m% \& Y9 hSub-clause: 28
9 r# n% r' j) D0 t/ [3 H# GSheet n. 230
8 S+ o" H ~0 k* u' zSubject: RECOGNIZING DIFFERENT TYPES OF SCREWS
9 v' T7 ^ r- _4 sKey words:
- o$ D+ ^1 `" {$ @-Screws, f/ N1 S M8 T. w, t% H
-Space threaded# V) O7 y7 i" v5 [( a1 F
-Thread cutting
5 v* Y+ U; t5 I4 H0 KDecision n. taken at 29th meeting/1992
+ Q' {+ D9 G5 `& s# yQuestion: In the 2nd edition of IEC 335-1 as well as in the 3rd edition the terms% k" K, n( C4 L0 H% Y8 l
- space-threaded screws,
' u, g# r9 `& p' J% o1 e# z" k" A& E- thread-cutting screws,8 c" J+ A) D) H8 N
- screws which form the thread by a swaging action
+ ^6 J. y# j! jare used.5 O2 _" u m; C6 S# F8 [
It is more and more convenient to use different types of thread-cutting and thread-forming
3 m8 z: q6 y! b, ^screws and it is difficult to identify whether it is a cutting or forming screw. The differentiation3 G9 S# ^1 j, _
is however necessary because for earth connections as well as for current carrying connections
) U7 T7 X* L8 v/ Drestrictions concerning the use of such screws are within the specifications.. f; \5 V/ c! M; N5 l
Therefore we want to show with the enclosed pictures what is our opinion on& Z) h+ e/ d- C) \
this matter. We would like to hear the opinions of other delegates.
3 d- K' N% p8 u$ |# E2 W0 LDecision: Mr. Reininger then introduces document IECEE/CTL (DE-EXP) 017/92, concerning IEC 335-
) F4 `- Z9 l8 S& c* \/ B1, Sub-clause 28 “Screws and Connections”, the problem being recognizing different types of' J3 Q/ b& m8 q- O0 N
screws and the judgment to which category they belong.$ w& G* C# C$ V$ t1 L
After discussion the Committee agrees with the German document and it was then decided to ?) x' f3 v8 ]
put it into the CTL list of current decisions.
$ D3 ?, Y# E1 T- R/ ?
: }: q( E C" ~9 o0 ` y; Y' S2 S; g' }
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