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27.4中:5 O7 e/ S7 K3 D* e/ q4 `
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 r8 N( P( W0 N! Y- s! H
或铝合金的接触而引起的腐蚀危险。7 r' R7 V3 n% h' t/ }& j
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。7 r0 F8 `# D- k/ B+ A
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。 J) q" g1 x$ V) R
+ H/ ^; a( I% E$ _' p+ A在168A决议中有这么一句话:
% T) Y2 W7 c- N4 I E: R7 r$ A2 ]- Aluminium and its alloys, provided special measures are taken for removing, where
# X# h0 H3 B; K: \2 Hnecessary, the oxide layer, for obtaining a sufficient and durable contact pressure/ N1 Z7 X8 D9 U) G6 l. y9 y
and for ensuring that the point of connection withstands the corrosion test specified;
; O: ~9 Q3 Q4 g0 m7 s- [3 P# N* p. y- a( x, |7 {
however, until a suitable corrosion test and an electrical performance test are
7 [0 A/ D+ t- [/ Q$ `available, aluminium and its alloys should preferably not be used for current-carrying9 Q. C4 F! s# e: N% u
parts and terminals within the equipment.) s! e) x" ]( B6 o* h7 E
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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