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|  DSH 280
L$ T4 h# |1 X( V% Y3 f: o3 a* D: \8 @; T
| Use of taptile screw to provide earthing continuity$ b* a) a- a" {3 Y3 }+ T) D
| 28.37 w/ H. y* ]' @1 H* U. `( ^
| 60335-1(ed.3)$ l/ w0 [6 E& H0 n! D
|
5 k2 b y# C' m$ p: H) k% HStandard: IEC 60335-1, Ed. 3.0 Sub clause: 28.3 Sheet n. 280" i5 \( i" t1 Y. Z6 K$ {
Page 1(2)! k- C* |: ^) P1 v! J
Subject: Use of taptile screw to
+ W5 T5 z+ D: c* oprovide earthing continuity% S$ A$ o) K' P9 y
Key words:' d( Z/ h. z4 b' ]
- taptile screw9 O3 W1 z" ^. {3 B7 \% J2 I9 L6 G
- earthing
0 q/ P& L, P3 V$ I- ]. U' k6 a' dDecision n. 20
- `! \3 R# e8 S6 N7 Ztaken
3 U5 j" n" ~) Hat 36th meeting/1999
, ^, b N. R. k$ sQuestion: A taptile screw is a screw providing self tapping during screwing.
/ ]8 m8 I; e4 O% V4 Q% t9 OIs this type of screw considered as a thread cutting or space thread screw regarding2 {- ^7 t/ }; r$ l& h
requirements of sub clause 28.3 (at least two screw are necessary to provide
" G# D- g: j' T- Q# i3 oearthing continuity) or is considered as a machine screw (only one screw is+ K5 r+ [/ D5 n2 ^( k
sufficient)?5 \ z7 V/ w" z
(See drawing on page 2).8 \% @0 x4 E$ _/ z- m+ i, Y
Decision: Only one taptile screw is enough to provide earthing continuity, if the screw has
( q: m0 q9 b! ]& f6 a1 Mthe same thread than a machine screw and if the shape is round.
9 J, U* B8 [/ b4 D o
. ]* u% M' H2 S$ t: C* P- R' i* o* g6 X M% O5 ^$ R. `; g
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