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[问题求助] 芯线绞距以及铜线绞距是什么意思啊?
P:2008-10-06 21:55:10
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芯线绞距是指芯线绞合、压出外被之后,同一根芯线旋转一圈后在水平方向上的距离,UL要求使用窗口法进行测量,具体的测试方法在UL 62 FUII中提到,如下:
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简单地说就是在外被上开一个4分之1个圆的窗口,窗口长度大概是这种线号的电线最大允许绞距的两倍加上25mm,然后量出2个绞距,除以2,得出实际绞距。
铜线绞距概念与芯线绞距类似,不同的是指的是芯线内的铜丝的绞距,测量方法也不是窗口法,一般是测一根铜丝的10个绞距再平均。
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Aspecimen of approximately four to six feet in length shall be cut from thesample coil or reel. The specimen shall be tightly secured, at both ends, tothe work surface before the window is cut, to ensure that the conductors cannot untwist. A “window”, exposing the conductor assembly, shall be cut in thejacket, while leaving at least 12 inches (300 mm) of the jacket intact at bothends. The window shall be approximately 1/4 of the circumference in width andapproximately one inch (25 mm) longer than twice the maximum required laylength for the sample. e.g. for a 3-conductor, 18 AWG cord (which has a max.lay of 2-1/4 inches or 57 mm), the window is:
2 (2-1/4) + 1 = approx. 5-1/2 inches long, or
2 (57) + 25 = approx. 139 mm
简单地说就是在外被上开一个4分之1个圆的窗口,窗口长度大概是这种线号的电线最大允许绞距的两倍加上25mm,然后量出2个绞距,除以2,得出实际绞距。
铜线绞距概念与芯线绞距类似,不同的是指的是芯线内的铜丝的绞距,测量方法也不是窗口法,一般是测一根铜丝的10个绞距再平均。
oxidation - 氧化,氧化作用 (1) 投诉
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