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|  DSH 280! u7 p7 C4 Q- c9 N1 D/ Q
" S* h; L& k% i3 \0 X( ~ | Use of taptile screw to provide earthing continuity. e% V% K- E) J8 {
| 28.3
, g1 b) l' B0 b8 A0 U | 60335-1(ed.3)
5 t8 Z' F) G( a5 ?0 m0 I |
1 a/ r" D& F' b: p" e$ ]Standard: IEC 60335-1, Ed. 3.0 Sub clause: 28.3 Sheet n. 2808 J4 D* B/ U& H3 t" r
Page 1(2)
3 L0 n3 h+ _7 I! T' \( V z2 p6 zSubject: Use of taptile screw to6 d: q+ m# F: Y+ I8 Q# h
provide earthing continuity7 u. l' j+ g$ l4 y, R
Key words:* E$ L5 f- R/ z) l+ e$ e6 Y
- taptile screw
; U$ h( b4 A* Z. e- earthing' }" u4 O' e1 ]" T2 E" s4 R
Decision n. 20% M; F# \- r$ P" `& F) ]' t
taken9 t2 s9 J7 W6 e; s
at 36th meeting/1999( Q# x9 K% `' Z1 p: i+ W. C
Question: A taptile screw is a screw providing self tapping during screwing.
: U7 X' P$ z. L+ C' T' y3 ZIs this type of screw considered as a thread cutting or space thread screw regarding
' {# a* D7 E. j8 e6 u b0 zrequirements of sub clause 28.3 (at least two screw are necessary to provide2 k! W; ]% j! B r$ R
earthing continuity) or is considered as a machine screw (only one screw is
% {7 ~4 H* U t0 j5 ]sufficient)?7 `& n5 k7 T! d, G `+ A) i' P
(See drawing on page 2).
" u$ K3 M6 I2 F& N& x# |2 `Decision: Only one taptile screw is enough to provide earthing continuity, if the screw has
; D1 d/ t& `( Y+ [- C( ithe same thread than a machine screw and if the shape is round." F1 b0 c: J6 z0 {2 K8 E
+ |8 l6 u$ N$ X2 s
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