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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
; Q6 ]% W3 o$ \5 m8 d5 h4.1.7 Joints; [2 N' {9 Z+ c) O
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4.1.7 Joints三维网技术论坛. Z+ w# Z) |# g6 F1 n0 |9 k! _$ _! H) J L$ |3 j- v
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! W* W9 u1 r9 H4 U
the diameter nor materially decrease the strength of the conductor or the individual wire. No more thanwww.3dportal.cn4 q6 ` L& {6 ]3 S* ]/ D G m: L# Z
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. r3 K+ f+ b0 L) Z5 Z
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
/ n; R9 Y/ n3 c) P, I# q! mIn a rope-lay-stranded conductor, which consists of a central core surrounded by one or more layers of
) Z. c7 ^, |- o: _" |: 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
6 n, ~/ F7 c* n% Y1 y, I, |$ Usuch, 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
: d# ^" P$ W9 o( H/ ?" m5 I( A$ ^' o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
0 \! _/ S7 H2 x2 H3 @# F0 i+ Z6 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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