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根据电压等级、负荷情况、环境温度、散热条件等选择电线、电缆是最基本的设计原则。大家都知道,电压等级、截面积选择小了的危害性,然而现场不少使用场合,如在没有相应规格产品,以后准备升压运行等情况下,用其它规格产品替代时,有的使用者由于对设计原则理解不透,步入了选用大规格产品就会“绝对保险”的使用误区,其实“大规格”也未必都会加大保险系数,“大”得不恰当或“大”不到点子上,不仅不经济,还会带来不安全因素,举例如下:
According to the voltage level, load conditions, ambient temperature, cooling conditions, select wire, cable is the most basic design principles. We all know that the voltage level, cross-sectional area of the small choice of hazardous, but many occasions on-site use, such as in the absence of the corresponding specifications of the product, after the preparation for step-up operation and other circumstances, with other specifications alternative products, some users Due to the imperfect understanding of the design principles, the use of large-size products into the “absolute insurance” misunderstanding, in fact, “large format” may not have increased insurance factor, “big” inappropriate or “big” less Ideas, not only uneconomical, but also bring insecurity, for example as follows: