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|  DSH 2803 ^: t. l' M* e/ u7 X
3 u3 S$ i. g! R# o0 G: ]
| Use of taptile screw to provide earthing continuity# r+ X1 y( T; a$ |6 g6 f! u y
| 28.3# Y( E$ }# R/ Q; o4 `
| 60335-1(ed.3)
: K) v f R4 o5 K6 m5 | |
$ ^1 ~+ t* z( Y {3 f% dStandard: IEC 60335-1, Ed. 3.0 Sub clause: 28.3 Sheet n. 280
5 W. Z9 H. i; a) o- x3 V% C$ c' bPage 1(2)
' n' D5 @) r" \6 tSubject: Use of taptile screw to& D7 m7 @9 z, I8 o4 e
provide earthing continuity
: Y- H' f, G- g2 _/ a) ]% xKey words:
; F/ u5 I! K ~. z5 U1 @- taptile screw# f2 b9 l, O/ b6 q9 T, k
- earthing8 P5 U& f1 O" D/ Y' ]6 E/ ]* S
Decision n. 20
& z* `( ~" b9 D, ]9 e0 [& n Htaken
, A& ~& }" |" @- Lat 36th meeting/1999/ E, a2 G+ Y% g
Question: A taptile screw is a screw providing self tapping during screwing.
/ ]% u$ c7 U2 L4 tIs this type of screw considered as a thread cutting or space thread screw regarding
5 C1 N, W4 r, L5 w- Y; R* Nrequirements of sub clause 28.3 (at least two screw are necessary to provide* ]% S- p6 k8 p; J' Y
earthing continuity) or is considered as a machine screw (only one screw is
+ }6 o" [; _# Usufficient)?1 s4 b9 ]! ^; b* W
(See drawing on page 2).; n5 U- t1 H$ j [! d( m/ l
Decision: Only one taptile screw is enough to provide earthing continuity, if the screw has
* f6 y; B; Z& M6 W( A+ q. U; bthe same thread than a machine screw and if the shape is round.& l) \% s0 t0 u( `% p$ z
0 E# w7 s; J( Q) p& D! {
9 Z# f I8 W3 p" k1 V5 b |
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