Distance between power cable tray and shielded cable
power cable requires 12 inches of separation unless a listed barrier or separate raceway is used. The regulation of distances between power cables in a trench is due to the need for heat dissipation, preventing damage during mechanical impacts, and facilitating subsequent repair. The spacing between trays, whether horizontal or vertical, depends on various factors like cable type, environment, and tray material. Separation isn't just an EMI precaution — it protects signaling, reduces rework, and ensures pathways meet inspection expectations across risers. Although BS 7671 touches on the subject of cable supports, it does not detail specifically what these support distances should be.
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