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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 example involves a two gang switch on two different circuits so there will be a two lines from the db, one to each switch and two switch lines, one leaving each switch. What are your views on a single conduit containing different circuits?



    No problem at all - L & SL for circuit 1 will balance, likewise L & SL for circuit two - combined together they still balance. So you can have one conduit for all 4 wires, or two conduits one for L & SL for circuit 1 and the other for L & SL for circuit 2. The only thing to avoid would be to have two conduits with both Ls in one and both SLs in the other. (c.p.c.s omitted for clarity ;-) )

       - Andy.
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    my example involves a two gang switch on two different circuits so there will be a two lines from the db, one to each switch and two switch lines, one leaving each switch. What are your views on a single conduit containing different circuits?



    No problem at all - L & SL for circuit 1 will balance, likewise L & SL for circuit two - combined together they still balance. So you can have one conduit for all 4 wires, or two conduits one for L & SL for circuit 1 and the other for L & SL for circuit 2. The only thing to avoid would be to have two conduits with both Ls in one and both SLs in the other. (c.p.c.s omitted for clarity ;-) )

       - Andy.
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