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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 3 l/ j" P- U0 O4 P" ^6 U/ O# S
4.1.7 Joints
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* W! J' b, s8 x+ v+ E* U& g4.1.7 Joints三维网技术论坛. Z+ w# Z) |# g6 F1 n0 |9 k- I3 J% a* w, O. S/ K. g
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; S6 A) U# W+ E' w5 x# e6 U( J7 }- X; D
the diameter nor materially decrease the strength of the conductor or the individual wire. No more thanwww.3dportal.cn4 q6 ` L& {6 ]3 S9 |- V2 Q! U$ ]) ?8 E0 O
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
3 w. }6 f# Z/ n Z& l/ tlayer 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
& U \4 g" z7 \8 jIn a rope-lay-stranded conductor, which consists of a central core surrounded by one or more layers of1 J* f; B7 I$ Z* I: m
: 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, k, c0 c" y( B4 `8 }( V
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
% r8 h% Q/ [" q! Q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
- m: s+ o, S" L( |0 p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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