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|  DSH 280
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! u+ D; m( [! ]/ V | Use of taptile screw to provide earthing continuity G, y; c) }5 C; t9 j" B' z$ b
| 28.3) z8 Y5 A6 v! L. W2 E3 H& s. I- Z
| 60335-1(ed.3)( S( k6 a" I" X) W K) n
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Standard: IEC 60335-1, Ed. 3.0 Sub clause: 28.3 Sheet n. 2801 H; n7 f' W+ v" r3 q
Page 1(2)& {* ~1 g( ~7 B
Subject: Use of taptile screw to
T& n4 j, M3 y% T" }0 Zprovide earthing continuity; a# W9 C5 }( Z
Key words:
7 C. V& J; D( ~6 y3 X$ x: X- taptile screw* H( H/ m# I0 m* Q% I; I
- earthing
# D+ P m# F% [* u; A, j! BDecision n. 20- u' T# ]3 G7 [3 X0 F$ U
taken6 g" O% }' g6 s, N9 n. @) }) q; A
at 36th meeting/1999) d( y0 F: J* q. j) D
Question: A taptile screw is a screw providing self tapping during screwing.
9 i4 w" H+ W% w: B7 UIs this type of screw considered as a thread cutting or space thread screw regarding: L5 N ~: X9 Q
requirements of sub clause 28.3 (at least two screw are necessary to provide# O, `7 F/ o$ P0 q0 c9 X8 \
earthing continuity) or is considered as a machine screw (only one screw is' E5 V: Q H$ H4 r- W
sufficient)?9 h2 \% K4 [# L2 S
(See drawing on page 2)., G0 L# e* G+ B: {/ ]( T
Decision: Only one taptile screw is enough to provide earthing continuity, if the screw has8 K G7 f+ D( S) Q" w
the same thread than a machine screw and if the shape is round.
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发表于 2012-9-14 13:16
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