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发表于 2011-6-5 15:25:03
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来自: 中国河北保定
本帖最后由 yjybd 于 2011-6-5 16:26 编辑 7 Q) E/ N1 q6 J
4.1.7 Joints$ p8 l! U* g( n; e- y! G, I$ M& n
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4.1.7 Joints三维网技术论坛. Z+ w# Z) |# g6 F1 n0 |9 k
& W2 {+ \2 V0 K5 \9 B! eA joint in a solid conductor or in one of the individual wires of a stranded conductor shall neither increase三维|cad|机械|汽车|技术|catia|pro/e|ug|inventor|solidedge|solidworks|caxa& }* D" x3 H* S$ b6 s% b; S
[& i9 I- @& C+ n7 s lthe diameter nor materially decrease the strength of the conductor or the individual wire. No more thanwww.3dportal.cn4 q6 ` L& {6 ]3 S
; M# G9 x$ ]( K% A# ^one of the wires in a stranded conductor of 19 wires or less, or more than one of the wires in any given三维|cad|机械|汽车|技术|catia|pro/e|ug|inventor|solidedge|solidworks|caxa$ X2 S& e" d. q: o9 c& p% C& U6 a& w6 V8 |' ?7 C H3 S
layer in a stranded conductor of more than 19 wires, shall be joined in any 0.3 m (1 ft) of conductor.三维网技术论坛+ v9 _( E8 @: V& H2 }/ K" M
: |3 u% F! o+ p4 G" EIn a rope-lay-stranded conductor, which consists of a central core surrounded by one or more layers of% l5 D9 e1 ~3 I/ _# s
: s9 x: F2 H/ L4 r i) o三维网技术论坛stranded members (primary groups), each member shall be considered equivalent to a solid wire, and aswww.3dportal.cn. `5 m) @ Q4 S1 }: F8 u6 G
: b/ I, T! \' N; W1 R9 _such, may be spliced as a unit. These joints shall not be any closer together than two lay lengths.三维网技术论坛6 X: O! X: d& b
5 N- }+ H- X, Z( R6 x6 h6 l7 {9 v美国UL44橡皮电缆标准里的一段话,如果有接头,接头既不能太多,也不能太大! | zhaogy2006 发表于 2011-5-20 10:53 http://www.3dportal.cn/discuz/images/common/back.gif 5 ?& N1 v- h- k" C0 }6 K4 R4 ~' E
不能太多,也不能太大,那多少是合适呢?? 原来美国人也玩文字游戏———— |
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