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发表于 2011-5-20 09:53:36
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4.1.7 Joints: t# ]6 P$ b: l' f; ?9 u' w
A joint in a solid conductor or in one of the individual wires of a stranded conductor shall neither increase. C3 T# R1 U5 o h
the diameter nor materially decrease the strength of the conductor or the individual wire. No more than/ Z; m8 {9 |6 A/ X( O
one of the wires in a stranded conductor of 19 wires or less, or more than one of the wires in any given
% c. G: R5 k/ H( F8 e% v/ n- z6 Qlayer in a stranded conductor of more than 19 wires, shall be joined in any 0.3 m (1 ft) of conductor.: P" ~+ i1 M. } K9 W! j
In a rope-lay-stranded conductor, which consists of a central core surrounded by one or more layers of
, u/ X- F4 x3 z. _) d+ k( Qstranded members (primary groups), each member shall be considered equivalent to a solid wire, and as
0 Y- ~3 N, S4 |& fsuch, may be spliced as a unit. These joints shall not be any closer together than two lay lengths.
' c; s2 K- e% v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! |
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