DSH 280 Use of taptile screw to provide earthing continuity

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DSH 280 + O  W9 ?' M0 h$ u# C' b5 s- J3 u # B) d8 o' C, \- s0 ]( [* N

Use of taptile screw to provide earthing continuity ( P# L8 H9 ]2 {5 g: R( v: X3 }

28.3 . b* _* g. c3 h

60335-1(ed.3) + O8 g+ F8 `2 l& ~0 ]

9 s; p+ [' N' \( [. B/ LStandard: IEC 60335-1, Ed. 3.0 Sub clause: 28.3 Sheet n. 280
Page 1(2)
Subject: Use of taptile screw to
/ t1 ]' w5 d. k7 I7 @: vprovide earthing continuity
Key words:
- taptile screw
! g5 X) L, t3 F( g, e- earthing
Decision n. 20
taken
at 36th meeting/1999
Question: A taptile screw is a screw providing self tapping during screwing.
0 m- p$ X# K8 i2 ]0 F1 r& G, |Is this type of screw considered as a thread cutting or space thread screw regarding
) N) N! i; {) lrequirements 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)?
  P0 i# b3 t! b0 f- C- Z4 Q) E(See drawing on page 2).
Decision: 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.
  T6 u0 k, p2 D$ n

5 s- ]$ u1 ^% d" H; Y8 m# T; _