DSH 280 Use of taptile screw to provide earthing continuity

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DSH 280 0 u+ m* w9 ?+ a0 [) }9 w ; i9 Q. T. S- d

Use of taptile screw to provide earthing continuity

28.3 ! M3 X7 C. N! g' {

60335-1(ed.3) + G- E3 w8 r/ q6 O; m3 J

1 m! W9 G  K% W( D& aStandard: IEC 60335-1, Ed. 3.0 Sub clause: 28.3 Sheet n. 280
Page 1(2)
Subject: Use of taptile screw to
* B; y/ Q! f5 L+ C) qprovide earthing continuity
/ G/ I2 T, o* eKey words:
- taptile screw
2 Y' \6 p' Y& x  Z. m5 \5 k) X7 k- earthing
- y2 m1 P3 x  Z3 iDecision n. 20
: @& h4 N3 |8 I* a) Vtaken
at 36th meeting/1999
4 v  j6 V% F! r& cQuestion: A taptile screw is a screw providing self tapping during screwing.
Is this type of screw considered as a thread cutting or space thread screw regarding
requirements of sub clause 28.3 (at least two screw are necessary to provide
earthing continuity) or is considered as a machine screw (only one screw is
sufficient)?
(See drawing on page 2).
) s, e& Z! a0 cDecision: Only one taptile screw is enough to provide earthing continuity, if the screw has
the same thread than a machine screw and if the shape is round.

! Z+ z7 |6 P' N8 m, d  d5 ~! m+ a) x
7 j, s6 b$ w) @* h, w- f! [# T