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請教一下什麼是螺釘有接觸壓力跟沒有接觸壓力??
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17 Electrical connections and mechanical fixings2 q7 C! R ~( W- l
17.1 DE Screw TERMINALS providing electrical contact and screw fixings which during the life of the: l) o7 f* q+ z% H$ m
apparatus will be loosened and tightened several times shall have adequate strength.
1 R" Y6 Q' ~) KScrews exerting contact pressure and screws with a nominal diameter less than 3 mm which form part of. m8 ^/ u8 q' H
the above-mentioned screw fixings shall screw into a metal nut or a metal insert.5 V7 [$ A- C; T; N$ P( E7 o% G
However, screws having a nominal diameter less than 3 mm, which do not exert contact pressure, need
- A$ V9 s% a0 `+ I9 U, \not be screwed into metal, provided that the screw fixing withstands the torque specified in table 20 for
' s6 j) V4 x) u! f( W( {screws of 3 mm diameter. |
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