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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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    mapj1:

    I'd be tempted to suggest, that for the purpose of the switch, an earth may be as simple as a short ink to the trunking. It is then not removed with the switch wiring. It is always possible I have the wrong mental picture of course.




    Indeed Mike. I expect that you were thinking of 543.2.7.


    "Where the protective conductor is formed by metal conduit, trunking or ducting or the metal sheath and/or armour of a cable, the earthing terminal of each accessory shall be connected by a separate protective conductor to an earthing terminal incorporated in the associated box or other enclosure."


    Also 543.2.5.


    Z.

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  • 0

    mapj1:

    I'd be tempted to suggest, that for the purpose of the switch, an earth may be as simple as a short ink to the trunking. It is then not removed with the switch wiring. It is always possible I have the wrong mental picture of course.




    Indeed Mike. I expect that you were thinking of 543.2.7.


    "Where the protective conductor is formed by metal conduit, trunking or ducting or the metal sheath and/or armour of a cable, the earthing terminal of each accessory shall be connected by a separate protective conductor to an earthing terminal incorporated in the associated box or other enclosure."


    Also 543.2.5.


    Z.

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