Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day, concerning the cross-sectional areas of power, signalling and control cables for field process instruments, is answered by the ECA:
We have two cables for the instruments; one is for signals and other is for the 230V power.
What is the minimum required are of the conductors for the power cables according to BS standards?
Answer: To meet BS 7671:2008, assuming that the circuit supplying the instruments is actually a power circuit and not part of the control system, the minimum size is 1.5mm2. For signal and control circuits, it is 0.5mm2 minimum. If the signal circuit is just an IT signal, it can be 0.1mm2.
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