DCS signal cable site layout requirements

We have already known about the classification of dcs signal cables. The DCS signal cables are divided into I, II, I, and II signal cables for convenience. In general, we will refer to Class I and II signal cables as signal cables, and Class III and IV signal cables and field power cables as power cables. However, in the case of conditions, the signal cable and the power cable should be routed by different cable troughs, especially when entering the DCS room (or cabinet). When these two cables do not meet the separate routing requirements, they must all use shielded cables (or shielded twisted pair cables) and meet the following requirements:

1. If the distance between the signal cable and the power cable is less than 15cm, a metal partition for shielding must be placed between the signal cable and the power cable, and the partition should be grounded. See Figure 1 (omitted) for details.

2. When the signal cable and the power cable are installed separately in the vertical or horizontal direction, the distance between the signal cable and the power cable should be greater than 15cm.

3. When the two sets of cables intersect perpendicularly, if the power cable does not have a shielding layer as shown by the dotted line in the figure, it is better to cover the intersection with an iron plate with a thickness of 1.6 mm or more.

For some applications with particularly high interference, such as 220V AC on the power cable, inductive load above 10A, and the power cable without shield, it is required to be separated from the vertical direction of the signal cable. 60cm or more.

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