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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:

    Hi Z


    No I’m not concerned about cables inducing current into other cables. The paddle switch simply operates the contactor, there are no electronics involved. My query was around the two cables to the paddle switch exiting the steel trunking in the same hole as the motor cables or would the paddle switch cables need to exit in a separate hole? My mind tells me that if they are all in the same hole then any eddy currents should cancel out but wasn’t sure




    If all of the circuit cables run through just one hole in the steel trunking there will be no Eddy currents induced in the metal of the trunking. This includes all of the motor supply cables and the two paddle switch cables. So there is nothing to worry about. 521.5.1.


    Z.


     

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  • 0

    Baldyhugh:

    Hi Z


    No I’m not concerned about cables inducing current into other cables. The paddle switch simply operates the contactor, there are no electronics involved. My query was around the two cables to the paddle switch exiting the steel trunking in the same hole as the motor cables or would the paddle switch cables need to exit in a separate hole? My mind tells me that if they are all in the same hole then any eddy currents should cancel out but wasn’t sure




    If all of the circuit cables run through just one hole in the steel trunking there will be no Eddy currents induced in the metal of the trunking. This includes all of the motor supply cables and the two paddle switch cables. So there is nothing to worry about. 521.5.1.


    Z.


     

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