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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 $ H6 | v1 k8 Q5 I+ Z3 g$ k5 S& v
4.1.7 Joints
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A 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
. n( i; [; S! U" r# \9 [the diameter nor materially decrease the strength of the conductor or the individual wire. No more thanwww.3dportal.cn4 q6 ` L& {6 ]3 S0 \+ S! r G' c
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, w k e6 H6 s' \" [' t6 e0 j
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
9 Z. }' n( }7 sIn a rope-lay-stranded conductor, which consists of a central core surrounded by one or more layers of
4 y+ n# {8 Z" z8 C: 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. }" N( u2 S: o+ s
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* G3 ?* g: i% g! E" r
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 4 u, Q' Y: d' A- q
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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