为了叙述方便，我们把Ⅰ、Ⅱ类电缆统称为电缆，把Ⅲ、Ⅳ类电缆和现场电源电缆统称为电源电缆。在有条件的，电缆和电源电缆应采用不同走线槽走线，在进入DCS机房（或机柜）时，也应尽可能相互远离。当这二种电缆无法分开走线要求时，它们必须都采用屏蔽电缆（或屏蔽双绞电缆），且以下要求：
　　1、如果电缆和电源电缆之间的间距小于15cm时，必须在电缆和电源电缆之间设置屏蔽用的金属隔板，并将隔板接地。详细参见图1(略)。
　　2、当电缆和电源电缆垂直方向或水平方向分离安装时，电缆和电源电缆之间的间距应大于15cm.
　　对于某些特别大的应用，如电源电缆上挂接电压为220V AC，电流在10A以上感性负载，而且电源电缆不带屏蔽层时，那么要求它与电缆的垂直方向间隔距离必须在60cm以上。
　　3、在两组电缆垂直相交时，若电源电缆不带屏蔽层如图中虚线所示，好用厚度在1.6mm以上的铁板覆盖交叉部分。
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