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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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  • 0
    Hi Z


    It is a farm but I got a new supply in recently for the customer recently and convinced them to give them TN-S for the well discussed earthing/bonding reasons. 

    On another note but related to the initial question, if coming out of a steel trunking   In pvc conduit to a plastic light switch with a plastic back box would you run the live/neutral/earth down to the switch and back out or just the lives. Reason I ask is that I have seen different methods of only lives to the switch and then some as L/N/E. Obviously a metal switch would require an earth cable ran to it and in domestic settings it is becoming more common to have a neutral in the switch box for a variety of reasons, but in my example of trunking/conduit coming out of a metal trunking to a plastic switch I was curious to other peoples methods


    thanks


    Peter
Reply
  • 0
    Hi Z


    It is a farm but I got a new supply in recently for the customer recently and convinced them to give them TN-S for the well discussed earthing/bonding reasons. 

    On another note but related to the initial question, if coming out of a steel trunking   In pvc conduit to a plastic light switch with a plastic back box would you run the live/neutral/earth down to the switch and back out or just the lives. Reason I ask is that I have seen different methods of only lives to the switch and then some as L/N/E. Obviously a metal switch would require an earth cable ran to it and in domestic settings it is becoming more common to have a neutral in the switch box for a variety of reasons, but in my example of trunking/conduit coming out of a metal trunking to a plastic switch I was curious to other peoples methods


    thanks


    Peter
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