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|  DSH 280/ J: L& a7 o' V; O
U5 o" d! d( K9 X* p+ x | Use of taptile screw to provide earthing continuity7 L% R2 a4 Z6 E h w0 {
| 28.3
7 b* _0 G; r, _; e4 w | 60335-1(ed.3)
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6 y/ X, y* F# b4 }3 GStandard: IEC 60335-1, Ed. 3.0 Sub clause: 28.3 Sheet n. 280
# |: _, ^8 V% N6 a0 aPage 1(2)
9 n0 n7 c4 m) b! P% g! [Subject: Use of taptile screw to- j2 O9 ?! y5 m
provide earthing continuity1 E4 K: |* C6 x/ O
Key words:3 k/ X! {. z5 T4 m8 r
- taptile screw; a! r1 H% ^. I7 }
- earthing
. D: C* D* R% x' C/ @" tDecision n. 20, z: K1 x5 \' R3 Q3 V* f: ]' G$ M
taken
0 x z2 N/ d' r5 Z) C6 qat 36th meeting/1999: k/ F2 S1 m* r
Question: A taptile screw is a screw providing self tapping during screwing.
( A* a# l) r2 {Is this type of screw considered as a thread cutting or space thread screw regarding1 Z# ^% E$ d$ f
requirements of sub clause 28.3 (at least two screw are necessary to provide
, P4 ]# c% D9 L Y/ z6 V- k4 a' pearthing continuity) or is considered as a machine screw (only one screw is+ J3 ?6 v" i1 D) x) `! C
sufficient)?& i2 ~- X+ F( a
(See drawing on page 2).+ [7 J% b# H" E9 d, q8 D
Decision: Only one taptile screw is enough to provide earthing continuity, if the screw has$ r0 [; a' R7 O1 b1 s2 [. p
the same thread than a machine screw and if the shape is round.
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3 A8 @2 Z, S+ Y4 d) k
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