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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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    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 




    Are you concerned about the motor supply cables inducing currents into the paddle switch cables and causing misoperation? If all of the cables are mains rated and originate from the same supply and are correctly fused for A.D.S. fault protection I can see no problems arising. Does the paddle switch operate a relay or does it carry small currents that operate electronic switching? If the motor is not running then motor currents will not affect the parallel run paddle switch cables. Perhaps when the motor is switched off induced current may cause a problem. The proof of the pudding etc.


    Yes you can run all of the circuit cables through the same hole in the steel trunking (motor and paddle switch) as the magnetic effects of the currents will cancel out. I can see no problem with that.


    Z.




     

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  • 0



    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 




    Are you concerned about the motor supply cables inducing currents into the paddle switch cables and causing misoperation? If all of the cables are mains rated and originate from the same supply and are correctly fused for A.D.S. fault protection I can see no problems arising. Does the paddle switch operate a relay or does it carry small currents that operate electronic switching? If the motor is not running then motor currents will not affect the parallel run paddle switch cables. Perhaps when the motor is switched off induced current may cause a problem. The proof of the pudding etc.


    Yes you can run all of the circuit cables through the same hole in the steel trunking (motor and paddle switch) as the magnetic effects of the currents will cancel out. I can see no problem with that.


    Z.




     

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