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27.4中:* Q) `! ]. Q3 e, o G2 x! R, x7 `
如果接地端子的主体是铝或铝合金制造的框架或外壳的一部分,则应采取预防措施以避免由于铜与铝 h/ F4 P# T4 Q% f, O
或铝合金的接触而引起的腐蚀危险。
( S8 M) F ?& u) H2 J% L M( H这里没区分是作为接地连续性还是作为接触压力的部件。因此铝和铜直接接触可能会引起不符合吧。2 h' U; _ g# \/ |" W
铆接只要不是圆形的本身是可以接受的,楼主目前还有铝和铜材料的问题。
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! i. O: ~4 }* p在168A决议中有这么一句话:; P3 X4 C' U. t- _: B% x
- Aluminium and its alloys, provided special measures are taken for removing, where0 M7 ?( h! g9 ]1 H
necessary, the oxide layer, for obtaining a sufficient and durable contact pressure
0 ?+ K5 b9 U+ r/ C5 f# U+ ^' X3 }, l$ Nand for ensuring that the point of connection withstands the corrosion test specified;) C% T: X$ Z2 e4 ]8 f0 i( y9 W
* y7 Y, Y# S7 M0 b, [, \3 ohowever, until a suitable corrosion test and an electrical performance test are( b4 w o3 V9 O8 h! r3 [
available, aluminium and its alloys should preferably not be used for current-carrying
% l1 k5 {& j+ O; m6 ~parts and terminals within the equipment.
" a% L# h/ A4 I0 D然而,除非合适的耐腐性测试和电性能测试证明其有效,否则,铝及其合金应该最好不要用于器具的带电部件和连接端子。 |
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