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发表于 2011-5-20 09:53:36
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4.1.7 Joints, x C( |9 W. d" k4 q) p
A joint in a solid conductor or in one of the individual wires of a stranded conductor shall neither increase
' i! C5 `6 J8 s$ e8 _the diameter nor materially decrease the strength of the conductor or the individual wire. No more than
: |: y0 @/ ]7 L' {5 Cone of the wires in a stranded conductor of 19 wires or less, or more than one of the wires in any given# _3 ~1 ^ h w' ^* `6 I1 Z& o2 T
layer in a stranded conductor of more than 19 wires, shall be joined in any 0.3 m (1 ft) of conductor.
$ Q8 {3 a. z: X) k, s9 fIn a rope-lay-stranded conductor, which consists of a central core surrounded by one or more layers of
& U' P1 {6 h2 @; ~stranded members (primary groups), each member shall be considered equivalent to a solid wire, and as/ E7 ^, O# c2 V) F4 P* r9 W, }
such, may be spliced as a unit. These joints shall not be any closer together than two lay lengths.2 j# ^/ V* J8 q5 p
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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