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27.4中:
: Z. j/ ]' S, g$ ^/ J: P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/ o7 y! @2 m* R5 C* l9 L9 b, J
或铝合金的接触而引起的腐蚀危险。) ~$ e0 [4 }* @6 K' N2 L
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。
- r9 X5 [& N6 P' V( z" l9 }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。, @8 c8 p% K- X8 Z! S" ?# p5 U/ Q
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在168A决议中有这么一句话:9 i0 N. J; e5 [# f: i% }
- Aluminium and its alloys, provided special measures are taken for removing, where
7 z% F$ Q; X/ L7 O1 T' dnecessary, the oxide layer, for obtaining a sufficient and durable contact pressure. U4 ?, H% A9 B2 R; W
and for ensuring that the point of connection withstands the corrosion test specified;- t* }8 `; q+ F3 O* n+ A
& L% t0 G! D W# u3 ] ^0 Ghowever, until a suitable corrosion test and an electrical performance test are6 ^# F% G% l0 d# X# g/ o, g2 g2 O2 H
available, aluminium and its alloys should preferably not be used for current-carrying5 n" U9 b) T# Y6 {) U
parts and terminals within the equipment.$ i3 V: ?$ P+ b) e, G
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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