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Cable routing/eddy currentso

Baldyhugh
Hi


I have a query regarding a cable route for  a job I’m currently on (when lockdown rules allow me back to it!). I have to supply a feed motor on a farm, the contactor feeding it is at one end of the building in a plant room. There is an existing steel trunking running the length of the building and I plan to come out of this close to the motor with pvc conduit. However there is a paddle switch in the meal hopper beside the motor that will control the contactor. This needs a simple two wire connection. My question is can I run these two cables out of the trunking in the same conduit as the cables to the motor. I plan to put a wiska box or similar at the other end of the conduit so that I can split off to the motor and paddle switch separately, and there will be an isolator before the motor. 

The question however remains regarding the ‘control cables’ in the same conduit as the motor supply. They are from the same circuit and the same voltage but was concerned about eddy currents. 

Thanks in advance
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    Baldyhugh:

    Thanks Z


    Method 2 can all go through a single hole Containing both circuits if I’m correct or separate holes for each circuit is also acceptable?




    Yes that is it. If you think of a current, say 3 Amps A.C. flowing into the switch box through a metal hole in one circuit wire, and 3 Amps flowing out of the same hole in another associated circuit wire, the magnetism cancels out from the two wires and there is virtually no induced current in the metal of the material in which the hole is cut. Therefore there is no heating effect in the metal.


    Z.

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  • 0

    Baldyhugh:

    Thanks Z


    Method 2 can all go through a single hole Containing both circuits if I’m correct or separate holes for each circuit is also acceptable?




    Yes that is it. If you think of a current, say 3 Amps A.C. flowing into the switch box through a metal hole in one circuit wire, and 3 Amps flowing out of the same hole in another associated circuit wire, the magnetism cancels out from the two wires and there is virtually no induced current in the metal of the material in which the hole is cut. Therefore there is no heating effect in the metal.


    Z.

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