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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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    My question was enquiring about different methods but also if an earth was required along with the live and switched live for eddy current reasons



    As long as the total currents balance you're fine. L will be balanced by SL (or Lin by Lout and SL if L is looped) in normal conditions (and L by PE if there's a L-PE fault). Looping a N in and out that's not connected to a load in the switch will still balance just the same - just with the N current added to both sides as it were.

       - Andy.
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  • 0

    My question was enquiring about different methods but also if an earth was required along with the live and switched live for eddy current reasons



    As long as the total currents balance you're fine. L will be balanced by SL (or Lin by Lout and SL if L is looped) in normal conditions (and L by PE if there's a L-PE fault). Looping a N in and out that's not connected to a load in the switch will still balance just the same - just with the N current added to both sides as it were.

       - Andy.
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