|
|

楼主 |
发表于 2011-6-5 15:25:03
|
显示全部楼层
来自: 中国河北保定
本帖最后由 yjybd 于 2011-6-5 16:26 编辑 $ }, W, z# t% o! ^+ a
4.1.7 Joints
# F7 |& s# E1 n
0 z* N- v' u! ^/ \, r: X7 u: c4 X B9 x4 R8 E( u9 _: p
, I: x: |4 L7 u# } d1 j u) h; f4.1.7 Joints三维网技术论坛. Z+ w# Z) |# g6 F1 n0 |9 k4 q$ Q: b; x$ _5 A K
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
$ `9 m. c" j xthe diameter nor materially decrease the strength of the conductor or the individual wire. No more thanwww.3dportal.cn4 q6 ` L& {6 ]3 S
5 A9 o5 K+ h3 ]/ w4 B) u; Kone 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
/ Z; J/ w( B! X, D T5 q6 ^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' i& T6 ^5 W, c6 o
In a rope-lay-stranded conductor, which consists of a central core surrounded by one or more layers of
3 r( U/ H+ C* K2 J: 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/ @+ _, v( ~8 \: V. S0 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
) ]- [! ]+ |2 g# b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 ( x l! t/ _5 p$ {; U7 o
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———— |
|