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|  DSH 230
8 _4 \/ O+ W! J9 S: q
# y% W) O! \( ~6 C4 l9 w Q | screws and connections
; `1 E3 u Y" s$ N$ C6 j | 28.35 D% o1 E/ m; }) ~: [% D
| 60335-1(ed.2) & 60335-1(ed.3)
5 ]5 U! D: ]5 f5 w1 @* R |
& v) N; A9 ~! q2 f! u
Standard:
* ^2 A7 o7 v" ~0 bIEC60335-1: 2nd, 19764 M% V% P7 n/ C2 v& G
IEC60335-1: 3rd, 1991) E6 ^5 j2 g* y
Sub-clause: 28
' \; k) H/ l0 s5 ^Sheet n. 230
. ?) f# W2 O+ Y( KSubject: RECOGNIZING DIFFERENT TYPES OF SCREWS0 r2 z `+ ?' u, m/ O5 n( N3 O
Key words:
f# ` @" X% U5 }. X. D. D-Screws
, n0 G& b8 K; M-Space threaded
& f3 e0 ]) l! w( `2 v-Thread cutting/ c. g! \4 ]5 J; S- F
Decision n. taken at 29th meeting/1992
( e3 Y; s$ y. E0 ?Question: In the 2nd edition of IEC 335-1 as well as in the 3rd edition the terms
( [3 U4 `( D, w% x' l. C+ N3 [. C+ T, ~- space-threaded screws,! g, t# o e3 f" C
- thread-cutting screws,
4 R% S! o" M+ B7 O I- screws which form the thread by a swaging action7 t4 o6 s# W& N, e4 Y L( [
are used.- ]8 A- V& }$ @' I
It is more and more convenient to use different types of thread-cutting and thread-forming
5 e- f/ |1 f0 U1 w( b1 iscrews and it is difficult to identify whether it is a cutting or forming screw. The differentiation
* d& j6 ~' h- _! D. r9 V [is however necessary because for earth connections as well as for current carrying connections7 y3 K- j/ b- O( B' X2 U, e9 P
restrictions concerning the use of such screws are within the specifications.
+ m7 K5 ^/ p9 }; NTherefore we want to show with the enclosed pictures what is our opinion on
6 }( |0 V+ S% [; t, Sthis matter. We would like to hear the opinions of other delegates.& H7 l) d) f; E! o
Decision: Mr. Reininger then introduces document IECEE/CTL (DE-EXP) 017/92, concerning IEC 335-
; S) z+ ?$ s' O V/ N1, Sub-clause 28 “Screws and Connections”, the problem being recognizing different types of
& a7 f5 z+ O& xscrews and the judgment to which category they belong.' T! r" s$ _4 a
After discussion the Committee agrees with the German document and it was then decided to1 x7 O- R8 `2 h. e9 Y& s4 d8 _# z3 T
put it into the CTL list of current decisions.2 L1 E& X4 ]& o, o
' h" p) a2 g f3 T, C- z% T
# d1 H% B; x5 ~2 `6 P |
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