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发表于 2011-6-5 15:25:03
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本帖最后由 yjybd 于 2011-6-5 16:26 编辑 k4 w0 Q- } _' s' e
4.1.7 Joints- S, e5 H1 w4 c9 a8 U1 i- n1 v* T
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4.1.7 Joints三维网技术论坛. Z+ w# Z) |# g6 F1 n0 |9 k
[, j3 x* B3 F3 \" rA 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; S0 ^$ j; ^1 ~$ f2 C8 Y0 {
the diameter nor materially decrease the strength of the conductor or the individual wire. No more thanwww.3dportal.cn4 q6 ` L& {6 ]3 S. Z" Z% f w' q$ I5 a: 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/ u" w0 R5 r* n' \6 d: I$ i, O
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" U" I. H+ Y% t/ M; J
In a rope-lay-stranded conductor, which consists of a central core surrounded by one or more layers of
1 L: A! h% T$ w( {) L3 u: 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
+ y* s0 B7 l& F |. Gsuch, 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& b5 ~' A0 x0 D ^
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
3 D0 K* _- {$ ~1 R6 {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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