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联结电路在选择保护导线时，我们通常要考虑整个设备供电线路的规格，常见的材料是选择铜和铝。如果这两种材料仍不能满足电流负荷，一般就要采取其他措施，如增加附加保护导线。下表为保护导体（铜）的截面积参考值：3.操作方式通过实践证明，要计算出机床的电气回路在负载条件下，负载电流的大小。根据负载电流从而得到保护器件的电流I，I要满足以上的三个公式。然后确定器件保护种类，根据机床设备的实际状况，计算相应参数。