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|  DSH 2803 G7 u& \ H, o% m# n# P
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| Use of taptile screw to provide earthing continuity. u8 B$ f- t! k
| 28.3
& P- q( K8 }5 r' U | 60335-1(ed.3)* ?& {- P8 @3 K e
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Standard: IEC 60335-1, Ed. 3.0 Sub clause: 28.3 Sheet n. 280
$ C8 @: L \, x# h7 R- e& |3 N& cPage 1(2)7 n) N, s1 B7 P1 D+ H$ F/ C
Subject: Use of taptile screw to L# f* [" ^! P) v" x1 C
provide earthing continuity
3 v$ p7 G) [# z+ q! f9 IKey words:
, [( ^6 \7 ?$ g6 [' m6 m( d- taptile screw+ j. S2 C# q: C" K w5 a* Q( g6 }$ ]& L
- earthing; N7 r$ Z4 ], N, F3 s) _6 v- C8 m1 M
Decision n. 206 n+ }. |1 J% u4 s4 ?/ O) c- m( \
taken
2 b% |9 \" {% D) y6 Zat 36th meeting/1999
( u7 M; U7 H8 q4 o. j/ m2 C! CQuestion: A taptile screw is a screw providing self tapping during screwing.: t1 \/ c6 X6 k! n1 A' P+ o6 ?$ f) f
Is this type of screw considered as a thread cutting or space thread screw regarding- K e1 @% X/ N' D! p7 q
requirements of sub clause 28.3 (at least two screw are necessary to provide/ S& T7 u/ A+ i) _7 ?
earthing continuity) or is considered as a machine screw (only one screw is2 A, u" v/ c- j" M7 c4 K( H
sufficient)?2 t F1 m2 F1 H. Q+ Q
(See drawing on page 2)., X1 F, u) g" R9 e `/ a
Decision: Only one taptile screw is enough to provide earthing continuity, if the screw has& ?2 w0 }5 K0 ]% F& Z. a
the same thread than a machine screw and if the shape is round.
7 R3 k' J) k) _
7 |8 i F4 q R6 @. |" F# Y0 z6 N. T, Q( X0 p0 G9 H$ b
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发表于 2012-9-14 13:16
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